WO2006057344A1 - ハニカム構造体 - Google Patents
ハニカム構造体 Download PDFInfo
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- WO2006057344A1 WO2006057344A1 PCT/JP2005/021697 JP2005021697W WO2006057344A1 WO 2006057344 A1 WO2006057344 A1 WO 2006057344A1 JP 2005021697 W JP2005021697 W JP 2005021697W WO 2006057344 A1 WO2006057344 A1 WO 2006057344A1
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- pores
- pore diameter
- catalyst
- porous ceramic
- average pore
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2425—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material
- B01D46/2429—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material of the honeycomb walls or cells
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2425—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material
- B01D46/24491—Porosity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2425—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material
- B01D46/24492—Pore diameter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
- B01D46/2474—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure of the walls along the length of the honeycomb
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
- B01D46/2478—Structures comprising honeycomb segments
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
- B01D46/2482—Thickness, height, width, length or diameter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2498—The honeycomb filter being defined by mathematical relationships
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/88—Handling or mounting catalysts
- B01D53/885—Devices in general for catalytic purification of waste gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/56—Platinum group metals
- B01J23/63—Platinum group metals with rare earths or actinides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/391—Physical properties of the active metal ingredient
- B01J35/393—Metal or metal oxide crystallite size
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional [3D] monoliths
- B01J35/57—Honeycombs
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/024—Multiple impregnation or coating
- B01J37/0242—Coating followed by impregnation
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0006—Honeycomb structures
- C04B38/0016—Honeycomb structures assembled from subunits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
- F01N3/0222—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
- F01N3/2825—Ceramics
- F01N3/2828—Ceramic multi-channel monoliths, e.g. honeycombs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
- B01D2275/30—Porosity of filtering material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
- B01D46/2476—Monolithic structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2235/00—Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties
- B01J2235/30—Scanning electron microscopy; Transmission electron microscopy
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0081—Uses not provided for elsewhere in C04B2111/00 as catalysts or catalyst carriers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
- F01N2330/00—Structure of catalyst support or particle filter
- F01N2330/06—Ceramic, e.g. monoliths
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S55/00—Gas separation
- Y10S55/05—Methods of making filter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S55/00—Gas separation
- Y10S55/10—Residue burned
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S55/00—Gas separation
- Y10S55/30—Exhaust treatment
Definitions
- the present invention relates to a filter for removing particulates and the like in exhaust gas discharged from an internal combustion engine such as a diesel engine, and a honeycomb structure used as a catalyst carrier and the like.
- Patent Document 1 a method using a pore forming agent
- a pore-forming agent there are used particles called an organic substance such as a resin, or a so-called balloon made of an organic substance or an inorganic substance in which a cavity is formed.
- these pore-forming agents are mixed with the raw material ceramic powder, etc., and molded and fired, the organic particles and balloons burn and disappear. As a result, a Hercam structure having large pores inside is obtained.
- Patent Document l WO 02Z96827 pamphlet
- the present invention has been made in view of the above-described problems, and the catalyst support layer is provided so that the initial pressure loss does not increase and the pressure loss is not easily increased even when particulates are collected. It is an object of the present invention to provide a hard cam structure which is attached and can be satisfactorily contacted with exhaust gas and the like and can sufficiently perform a catalytic function.
- the porous ceramic member formed by sealing one end of a plurality of cells penetrating in the longitudinal direction across the wall is an adhesive layer. And a plurality of pores formed in the porous ceramic member having a relatively large pore diameter. And the pore diameter is relatively small and consists of small pores,
- the thickness of the catalyst support layer is X (/ z m),
- the ratio of the average pore diameter of the atmospheric pores to the average pore diameter of the small pores (the average pore diameter of the atmospheric pores Z and the average pore diameter of the small pores) multiplied by the porosity (%) of the porous ceramic member Is Y
- the her cam structure of the second aspect of the present invention has one end portion of a plurality of cells penetrating in the longitudinal direction across the wall portion, and the wall portion is provided with a catalyst supporting layer.
- a Herm cam structure that also has a porous ceramic force
- the pores formed in the porous ceramic are composed of atmospheric pores having a relatively large pore diameter and small pores having a relatively small pore diameter.
- the thickness of the catalyst support layer is X (/ z m),
- the ratio of the average pore diameter of the atmospheric pores to the average pore diameter of the small pores (the average pore diameter of the atmospheric pores Z and the average pore diameter of the small pores) multiplied by the porosity (%) of the porous ceramic member Is ⁇ ,
- the first hard-cam structure of the present invention has a silicon carbide ceramic force.
- the second hard-cam structure of the present invention is preferably made of cordierite.
- a hermetic structure having a structure in which a plurality of porous ceramic members are combined via an adhesive layer such as the hermetic structure of the first aspect of the present invention
- a combined type such as the hermetic structure of the first aspect of the present invention
- a honeycomb structure having a structure in which the whole is integrally formed such as the her cam structure of the second invention
- an integral honeycomb structure when it is not necessary to distinguish between the integral honeycomb structure and the aggregated honeycomb structure, they are simply referred to as a “her cam structure”.
- the small pore means a pore having a pore diameter of less than 30 m observed with a scanning electron microscope (hereinafter referred to as SEM).
- SEM scanning electron microscope
- the average pore diameter means the average value of the pore diameters of the small pores.
- the atmospheric hole formed in the her cam structure of the present invention includes a super atmospheric hole having a diameter of 40 to 90% with respect to the thickness of the partition wall of the her cam structure. Better ,.
- the superatmospheric pores are formed due to the fact that a plurality of pore forming agents in the ceramic molded body used for firing are close to each other, and the aspect ratio thereof is 2 or more. I want it.
- the shape of the superatmospheric hole is elongated, it is a force that facilitates the passage of gas.
- the pore-forming agent is a material mainly used for forming air holes in the porous ceramic (porous ceramic member), and is contained in the ceramic molded body used for firing. .
- honeycomb structures of the first and second present inventions (average pore diameter of atmospheric pores Z, average pore diameter of small pores) X porosity of porous ceramic (porous ceramic member) and honeycomb
- the honeycomb structure has sufficient mechanical strength and has sufficient catalytic strength when it collects particulates with low initial pressure loss and has a catalytic ability. Can be provided.
- the porous ceramic member formed by sealing one end of a plurality of cells penetrating in the longitudinal direction across the wall is an adhesive layer. And a plurality of pores formed in the porous ceramic member having a relatively large pore diameter. And the pore diameter is relatively small and consists of small pores,
- the thickness of the catalyst support layer is X (/ zm), The ratio of the average pore diameter of the atmospheric pores to the average pore diameter of the small pores (the average pore diameter of the atmospheric pores Z and the average pore diameter of the small pores) multiplied by the porosity (%) of the porous ceramic member Is ⁇ ,
- FIG. 1 is a perspective view schematically showing a her cam structure according to the first aspect of the present invention
- FIG. 2 (a) is a diagram showing a porous structure constituting the her cam structure shown in FIG.
- FIG. 2B is a cross-sectional view of the porous ceramic member shown in FIG.
- the her cam structure of the first aspect of the present invention is a collective her cam structure 10, and a porous ceramic member 20 having silicon carbide isotropic force is used as an adhesive layer.
- a plurality of cylinders 11 are combined to form a cylindrical ceramic block 15, and a sealing material layer (coat layer) 12 is formed around the ceramic block 15.
- the shape of the ceramic block is a columnar shape.
- the ceramic block is limited to a columnar shape as long as it is columnar.
- it may be of any shape such as an elliptical columnar shape or a prismatic shape.
- the porous ceramic member 20 has a large number of cells 21 arranged in the longitudinal direction, and a wall portion (cell wall) 23 separating the cells 21 from each other. It is functioning as a filter. That is, in the cell 21 formed in the porous ceramic member 20, as shown in FIG. 2 (b), either the inlet side or the outlet side end of the exhaust gas is sealed with the sealing material 22, The exhaust gas flowing into the cell 21 always passes through the wall portion (cell wall) 23 separating the cells 21 and then flows out from the other cells 21.
- the Hercam structure according to the first aspect of the present invention mainly has a porous ceramic force.
- the material include nitride ceramics such as aluminum nitride, silicon nitride, boron nitride, and titanium nitride, and carbonized carbon.
- carbide ceramics such as silicon, zirconium carbide, titanium carbide, tantalum carbide, and tandene carbide, and oxide ceramics such as alumina, zircoure, cordierite, mullite, and silica.
- the hard cam structure 10 is formed of a composite of silicon and silicon carbide, aluminum titanate, and two or more kinds of material forces. It may be. When using a composite of silicon and silicon carbide, it is desirable to add silicon in an amount of 0 to 45% by weight of the whole! /.
- Silicon carbide-based ceramic means silicon carbide with a content of 60 wt% or more.
- the Hercam structure 10 according to the first aspect of the present invention is a Hercam structure to which a catalyst support layer is attached, and a catalyst is supported on the catalyst support layer.
- the catalyst is not particularly limited, but it can reduce the activity energy of the particulate combustion and make it easy to burn the particulate, and remove harmful gas components in the exhaust gas such as CO, HC and NOx.
- noble metals such as platinum, palladium and rhodium can be mentioned. Of these, platinum, palladium, and so-called three-way catalysts, which can also be used as a vacuum, are desirable.
- alkali metals Group 1 of the Periodic Table of Elements
- alkaline earth metals Group 2 of the Periodic Table of Elements
- rare earth elements Group 3 of the Periodic Table of Elements
- transition metal elements and the like may be supported.
- Such a hard cam structure 10 can purify CO, HC, NOx and the like in the exhaust gas.
- the her cam structure 10 can filter the particulate matter in the exhaust gas. As well as a catalytic converter for purifying CO, HC, NOx, etc. contained in the exhaust gas.
- the catalyst when the catalyst is attached to the hard cam structure 10, it is desirable to attach the catalyst after the surface is previously coated with a catalyst carrier such as alumina. As a result, the specific surface area can be increased, the degree of dispersion of the catalyst can be increased, and the number of reaction sites of the catalyst can be increased. Further, since the catalyst carrier can prevent sintering of the catalyst metal, the heat resistance of the catalyst is also improved.
- a catalyst carrier such as alumina
- Examples of the catalyst-supporting layer include oxide ceramics such as alumina, titer, zirconium, silica, and ceria.
- the pores formed in the porous ceramic member are composed of atmospheric pores having a relatively large pore diameter and small pores having a relatively small pore diameter, and the catalyst support layer. And the ratio of the average pore diameter of the atmospheric pores to the average pore diameter of the small pores (the average pore diameter of the atmospheric pores Z and the average pore diameter of the small pores) of the porous ceramic member.
- Y is the value multiplied by the porosity (%)
- X and Y satisfy the following formulas (1) and (2).
- FIG. 5 is a graph showing the relationship between the layer thickness of the catalyst support and the like and (average pore diameter of atmospheric pores) (average pore diameter of small pores) X porosity of the porous ceramic member.
- ⁇ 6 ⁇ +80.5
- ⁇ 6 ⁇ + 230.5
- ⁇ —6 ⁇ + 330
- ⁇ —6 ⁇ + 474
- the honeycomb structure according to the first aspect of the present invention (the average pore diameter of the atmospheric pores and the average pore diameter of the small pores) X of the porosity of the porous ceramic member and the layer of the catalyst carrier or the like formed on the honeycomb structure
- the relationship with the thickness is included in the region in the parallelogram shown in FIG. 5 (when the above formulas (1) and (2) are satisfied)
- the honeycomb structure has sufficient mechanical strength and the pressure loss hardly rises even when particulates having a low initial pressure loss are collected.
- the small pores are too large and the atmospheric pores are too small. If the small pores are too large, the particulates are deep-filtered in the small pores when the particulates are collected. As the particulate deposition layer becomes thicker, the pressure loss increases.
- the air hole is too small, the gas permeability may deteriorate and the transient pressure loss may increase. If the air holes are too small, the super-atmospheric holes formed by the close proximity of two or three air holes are less likely to appear, so the gas permeability is higher than when there are super-atmospheric holes. Tend to get worse.
- the thickness of the layer of the catalyst carrier or the like that satisfies the equations (1) and (2) is in the range of 8.3 to 33 / ⁇ ⁇ as shown in FIG.
- the thickness of the catalyst carrier layer is less than 8.3 m, the amount of the catalyst carrier is too small, so that the dispersibility of the noble metal catalyst is deteriorated and the honeycomb structure having sufficient catalyst durability and
- the thickness of the catalyst carrier layer exceeds 33 m, the thickness of the catalyst carrier layer becomes too thick, and even if the diameter of the small pores is increased, the small pores are almost blocked. As a result, gas passes through the surface of the small pores, causing a catalytic reaction.
- the porosity of the porous ceramic member 20 is not particularly limited, but the lower limit is preferably 40%, and the preferable upper limit is 75%. If the porosity is less than 40%, it will be difficult to increase the proportion of the atmospheric pores, and the effect of forming the atmospheric pores will not appear. On the other hand, if the porosity exceeds 75%, the mechanical strength of the honeycomb structure will be reduced. It will be difficult to maintain.
- the upper limit of the porosity of the porous ceramic member 20 is more preferably 65%.
- the porosity can be measured by a conventionally known method such as a mercury intrusion method, an Archimedes method, or a measurement using a scanning electron microscope (SEM).
- a conventionally known method such as a mercury intrusion method, an Archimedes method, or a measurement using a scanning electron microscope (SEM).
- the pore diameters of the atmospheric pores constituting the Hercam structure 10 are those with a pore diameter of 30 to LOO ⁇ m observed by SEM, but the pore diameters of the atmospheric pores are desirable.
- the lower limit is 40 ⁇ m. If the average pore diameter of the atmospheric pores is less than 30 m, the pore size of the atmospheric pores is small, so if the layer of the catalyst carrier or the like is slightly thicker, the pores are likely to be clogged, resulting in pressure loss. On the other hand, when the average pore diameter exceeds 100 m, the pore diameter becomes too large, so that the mechanical strength can be sufficiently increased.
- the Hercam structure 10 includes superatmospheric holes whose pore diameters observed by SEM exceed 100 ⁇ m. The effect of reducing the pressure loss is increased.
- Fig. 6 is a SEM photograph showing the result of observing pores formed in the cell wall by SEM by cutting the cell wall. As shown in the figure, a catalyst layer is formed so as to cover the SiC particles. Small pores of less than 0 m are formed, and atmospheric pores of 30 to 100 m that are thought to have been formed mainly by the pore-forming agent are also observed.
- a large space that can be considered as a pore is formed in addition to small pores and atmospheric pores, and the diameter (length in the longitudinal direction) of the space exceeds 100 m.
- pores which are called superatmospheric pores.
- the her cam structure 10 includes superatmospheric holes having a diameter of 40 to 90% with respect to the thickness of the wall portion (cell wall) separating the cells of the her cam structure 10. I hope that. If the diameter is less than 0%, the effect of suppressing an increase in pressure loss does not sufficiently appear, and if it exceeds 90%, it becomes difficult to maintain the mechanical strength of the honeycomb structure 10.
- the thickness of the cell wall is preferably 0.6 mm or less, and the diameter of the superatmospheric hole is preferably 540 m or less.
- the air holes formed in the honeycomb structure 10 include superatmospheric holes having a diameter of 65 to 80% with respect to the thickness of the wall portion (cell wall) separating the cells of the honeycomb structure 10. I hope it will be.
- the proportion of superatmospheric pores is preferably 30-80 vol%.
- the pore diameter of the small pores formed in the Hercam structure 10 is 30 pore diameters observed by SEM.
- the force is less than ⁇ m and is 5 ⁇ m or more.
- the average pore diameter of the small pores is 30 ⁇ m or more, the small pores become too large and the particulates are filtered through the depth, and the accumulated particulate layer becomes thick and the pressure loss becomes large. If the pore size of the small pores is less than 5, the pore size becomes too small, and the pressure loss increases even if the layer of the catalyst carrier or the like is thin.
- the pore-forming agent include balloons that are fine hollow spheres composed of acid ceramics, organic particles composed of organic substances such as spherical acrylic particles (eg, resin), and inorganic particles such as graphite. Etc.
- the balloon is not particularly limited, and examples thereof include an alumina balloon, a glass micro balloon, a shirasu balloon, a fly ash balloon (FA balloon), and a mullite balloon. Of these, alumina balloons are desirable.
- the particle size of the ceramic used in the production of the Hercam structure 10 is not particularly limited, but it is desirable that the ceramics have less shrinkage in the subsequent firing step, for example, 0.3 to 50 / A combination of 100 parts by weight of powder having an average particle diameter of about ⁇ and 5 to 65 parts by weight of powder having an average particle diameter of about 0.1 to 1.0 m is desirable.
- a ceramic structure having a porous ceramic force can be produced by mixing the ceramic powder having the above particle diameter in the above-described composition.
- the porosity and the proportion of pores having a pore size of 10 m or less can be controlled to some extent.
- the sealing material 22 and the wall portion 23 constituting the porous ceramic member 20 are made of the same porous ceramic.
- the adhesive strength between the two can be increased, and the thermal expansion coefficient of the wall 23 and the thermal expansion coefficient of the sealing material 22 can be adjusted by adjusting the porosity of the sealing material 22 in the same manner as the wall 23.
- the gap between the sealing material 22 and the wall 23 due to thermal stress during manufacturing or use, or the wall of the portion that contacts the sealing material 22 or the sealing material 22 It is possible to prevent the portion 23 from being cracked.
- the wall portion means both the cell wall and the outer peripheral portion that separate the cells 21 from each other.
- the thickness of the sealing material 22 is not particularly limited.
- the sealing material 22 is made of porous silicon carbide, it is desirable that the thickness is 1 to 20 mm. Is more desirable
- the thickness of the cell wall 23 is not particularly limited, but the desirable lower limit is 0.1 mm, and the desirable upper limit is 0.6 mm. If the thickness is less than 1 mm, the strength of the her cam structure 10 may not be sufficient. If it exceeds 0.6mm, the pressure loss increases.
- the adhesive layer 11 is provided between the porous ceramic members 20.
- the sealing material layer 12 is formed on the outer peripheral surface of the her cam block 15, while functioning as an adhesive (or sealing material) that binds the plurality of porous ceramic members 20 to each other.
- the outer peripheral surface force of the her cam block 15 also has a sealing material and shape for preventing the exhaust gas passing through the cell from leaking out. It functions as a trimming or reinforcing material.
- the adhesive layer 11 and the sealing material layer 12 may have the same material strength or different materials. Furthermore, when the adhesive layer 11 and the sealing material layer 12 are made of the same material, the blending ratio of the materials may be the same or different. Also, it may be dense or porous, but it is desirable to be dense when the emphasis is on the sealing ability to prevent the inflow of gas.
- the material constituting the adhesive layer 11 and the sealing material layer 12 is not particularly limited, and examples thereof include those composed of an inorganic binder, an organic binder, inorganic fibers and / or inorganic particles.
- Examples of the inorganic binder include silica sol and alumina sol. These may be used alone or in combination of two or more. Among the inorganic binders, silica zonole is desirable.
- organic binder examples include polybulal alcohol, methyl cellulose, ethyl cellulose, carboxymethyl cellulose, and the like. These may be used alone or in combination of two or more. Among the above organic binders, carboxylmethylcellulose is desired.
- examples of the inorganic fibers include ceramic fibers such as silica alumina, mullite, alumina, silica, and the like. These may be used alone or in combination of two or more. Among the inorganic fibers, silica alumina fibers are desirable.
- Examples of the inorganic particles include carbides, nitrides, and the like. Specific examples include inorganic powders or whiskers such as silicon carbide, silicon nitride, and boron nitride. These may be used alone or in combination of two or more. Of the inorganic particles, silicon carbide having excellent thermal conductivity is desirable.
- the paste used for forming the sealing material layer or the adhesive layer may be used as necessary.
- a pore-forming agent such as balloons that are fine hollow spheres containing oxide ceramics, spherical acrylic particles, or graphite may be added.
- the balloon is not particularly limited, and examples thereof include an alumina balloon, a glass micro balloon, a shirasu balloon, a fly ash balloon (FA balloon), and a mullite balloon. Of these, alumina balloons are desirable.
- the Hercam structure of the present invention on which the catalyst is supported functions as a gas purifier similar to a conventionally known DPF (diesel “particulate” filter) with a catalyst. Therefore, the detailed description in the case where the integrated her-cam structure of the present invention also functions as a catalyst carrier is omitted here.
- extrusion molding is performed using a raw material paste mainly composed of ceramic as described above.
- the raw material paste is not particularly limited, but it is desirable to have a porosity force of 0 to 75% of the manufactured Hercum structure.
- a powder having a ceramic force as described above examples include a pore-forming agent and a dispersion medium.
- the particle size of the ceramic powder is not particularly limited, but it is preferable that the ceramic powder has less shrinkage in the subsequent firing step.
- a combination of 5 to 65 parts by weight of powder having an average particle size of about 1 to 1.0 m is preferred.
- the porosity and the pore diameter can be adjusted by adjusting the particle size of the ceramic powder.
- the binder is not particularly limited, and examples thereof include methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, polyethylene glycol, phenol resin, and epoxy resin.
- the amount of the binder is usually preferably about 1 to about LO parts by weight with respect to 100 parts by weight of the ceramic powder.
- the dispersion medium liquid is not particularly limited, and examples thereof include organic solvents such as benzene, methanol, and the like. Examples thereof include alcohol, water and the like.
- the dispersion medium liquid is blended in an appropriate amount so that the viscosity of the raw material paste is within a certain range.
- a molding aid may be added to the raw material paste as necessary.
- the molding aid is not particularly limited, and examples thereof include ethylene glycol, dextrin, fatty acid sarcophagus, and polyvinyl alcohol.
- a pore-forming agent such as balloons that are fine hollow spheres containing oxide ceramics, spherical acrylic particles, and graphite to the raw material paste.
- a pore-forming agent such as balloons that are fine hollow spheres containing oxide ceramics, spherical acrylic particles, and graphite
- the balloon is not particularly limited, and examples thereof include an alumina balloon, a glass micro balloon, a shirasu balloon, a fly ash balloon (FA balloon), and a mullite balloon. Of these, alumina balloons are desirable.
- the ceramic molded body is dried using a microwave dryer, a hot air dryer, a dielectric dryer, a vacuum dryer, a vacuum dryer, a freeze dryer, or the like to obtain a ceramic dried body.
- a predetermined amount of a sealing material paste as a sealing material is filled in the end of the inlet side cell group on the outlet side and the end of the outlet side cell group on the inlet side, and the cells are sealed.
- the above-mentioned sealing material paste is not particularly limited, but it is desirable that the sealing material produced through a subsequent process has a porosity of 0 to 75%. Can be used.
- the porous ceramic member 20 having a porous ceramic force and having a single sintered body force as a whole can be manufactured.
- the conditions for degreasing and firing the ceramic dried body the conditions conventionally used for producing a filter made of a porous ceramic can be applied.
- the adhesive is then applied to the side surface of the porous ceramic member 20.
- the adhesive paste used to form the material layer 11 is applied with a uniform thickness to form an adhesive paste layer, and the other porous ceramic member 20 is sequentially laminated on the adhesive paste layer.
- a porous ceramic member assembly having a predetermined size is produced.
- this porous ceramic member assembly is heated to dry and solidify the adhesive paste layer to form the adhesive layer 11.
- the porous ceramic member assembly in which a plurality of porous ceramic members 20 are bonded via the adhesive layer 11 is cut to produce a cylindrical ceramic block 15.
- a catalyst support layer is formed. It is desirable that a catalyst such as a noble metal is applied to the catalyst support layer.
- Examples thereof include a method of impregnating a ceramic fired body with a solution containing alumina powder and heating.
- a metal compound containing rare earth elements such as Ce (NO) is used.
- a method for imparting a catalyst to the alumina membrane for example, a method in which a ceramic fired body is impregnated with a dinitrodiammine platinum nitrate solution ([Pt (NH) (NO)] HNO) or the like is heated.
- a dinitrodiammine platinum nitrate solution [Pt (NH) (NO)] HNO
- Etc. can be mentioned.
- the use of the her cam structure of the first aspect of the present invention is not particularly limited, but it is desirable to use it in a vehicle exhaust gas purification device. The same applies to the second hard cam structure of the present invention described below.
- FIG. 3 is a cross-sectional view schematically showing an example of an exhaust gas purifying device for a vehicle in which the her cam structure of the present invention is installed.
- the exhaust gas purifying device 70 mainly includes a her cam structure 10, a casing 71 covering the outer side of the her cam structure 10, and the her cam structure 10. It is composed of a holding sealing material 72 arranged between the casing 71 and an introduction pipe 74 connected to an internal combustion engine such as an engine is connected to the end of the casing 71 on the side where exhaust gas is introduced. A discharge pipe 75 connected to the outside is connected to the other end of the casing 71. In Fig. 3, the arrows indicate the flow of exhaust gas.
- exhaust gas discharged from an internal combustion engine such as an engine is introduced into the casing 71 through the introduction pipe 74, and the inlet side cell power After flowing into the two-cam structure and passing through the wall, particulates are collected and purified by this wall, and then the outlet cell force is also discharged out of the hard-cam structure, and the discharge pipe 75 is discharged. It will be discharged to the outside.
- a catalyst is attached to the Hercam structure, so that harmful gas components in exhaust gas such as CO, HC and NOx can be purified.
- the particulates may be burned and removed using a post-injection method, or a catalyst support layer and a catalyst layer may be formed in front of the her cam structure and the reaction heat may be used. Good.
- a heating means not shown
- the heart cam structure is heated and the particulates deposited on the walls are removed by combustion. Even so.
- the particulates can be burned and removed at a temperature lower than the normal temperature depending on the type of the catalyst.
- the her cam structure of the second aspect of the present invention comprises a plurality of cells penetrating in the longitudinal direction across a wall portion. Any one of the following is sealed, and the above-mentioned wall portion is a her cam structure having a porous ceramic force with a catalyst supporting layer attached thereto,
- the pores formed in the porous ceramic are composed of atmospheric pores having a relatively large pore diameter and small pores having a relatively small pore diameter.
- the thickness of the catalyst support layer is X m
- the ratio of the average pore diameter of the atmospheric pores to the average pore diameter of the small pores (the average pore diameter of the atmospheric pores Z and the average pore diameter of the small pores) multiplied by the porosity (%) of the porous ceramic member Is ⁇ ,
- Fig. 4 (a) is a perspective view schematically showing a specific example of an integrated her cam structure which is another example of the her cam structure of the second invention, ) Is a cross-sectional view taken along the line B-B.
- the hard cam structure 30 of the present invention includes a porous ceramic in which a large number of cells 31 are arranged in parallel in the longitudinal direction with a wall portion (cell wall) 33 therebetween.
- a cylindrical ceramic block 35 is formed.
- the wall means both the cell wall separating the cell 31 and the outer peripheral part.
- the ceramic block 35 is sealed by the sealing material 32 so that the end of the cell 31 is! /, Or shifted, as shown in FIG. 4 (b). Stopped! /
- a predetermined cell 31 is sealed with the sealing material 32 at one end, and the sealing material 32 is sealed at the other end of the ceramic block 35.
- the cells 31 that are not sealed by the sealing are sealed with the sealing material 32.
- the exhaust gas flowing into one cell 31 always passes through the cell wall 33 separating the cells 31 and then flows out from the other cells 31.
- the cell wall 33 separating the two can function as a particle collecting filter.
- a sealing material layer may be formed around the ceramic block 35 in the same manner as the hard structure 10 shown in FIG.
- the porous ceramic constituting the above-mentioned Hercam structure is not particularly limited, for example, Cordierite, alumina, silica, mullite, zirconium oxide, yttria, etc., oxide ceramics, silicon carbide, zirconium carbide, titanium carbide, tantalum carbide, tungsten carbide, etc. carbide ceramics, aluminum nitride, silicon nitride, boron nitride, Examples thereof include nitride ceramics such as titanium nitride.
- an oxide ceramic such as cordierite is preferable. It can be manufactured at a low cost and has a relatively small coefficient of thermal expansion.For example, it can not be broken during the use of the her cam structure of the present invention as the above-mentioned her cam filter. It is never done.
- the shape of the ceramic block 35 is a columnar force.
- the ceramic block is limited to a columnar shape if it is a columnar shape.
- an arbitrary shape such as an elliptical columnar shape or a prismatic shape may be used.
- the second cam structure 30 of the present invention is a two-cam structure configured such that a catalyst support layer adheres and a catalyst is supported on the catalyst support layer.
- the catalyst is not particularly limited, but can reduce the combustion energy of particulates, and can purify harmful gas components in exhaust gases such as CO, HC and NOx.
- noble metals such as platinum, palladium, rhodium and the like can be mentioned. Of these, a so-called three-way catalyst composed of platinum, palladium, and rhodium is desirable.
- alkali metals Group 1 of the Periodic Table of Elements
- alkaline earth metals Group 2 of the Periodic Table of Elements
- rare earth elements Group 3 of the Periodic Table of Elements
- transition metal elements etc.
- Such a hard cam structure 30 can purify CO, HC, NOx and the like in the exhaust gas.
- the her cam structure 10 Since the catalyst is supported on the catalyst support layer of the her cam structure 30, the her cam structure 10 functions as a filter that collects particulates in the exhaust gas and is contained in the exhaust gas. It functions as a catalytic converter for purifying CO, HC and NOx.
- the surface is previously removed. It is desirable to adhere the catalyst after coating with a catalyst support layer such as alumina. As a result, the specific surface area can be increased, the degree of dispersion of the catalyst can be increased, and the number of reaction sites of the catalyst can be increased. Further, since the catalyst carrier can prevent sintering of the catalyst metal, the heat resistance of the catalyst is also improved.
- Examples of the catalyst support layer include oxide ceramics such as alumina, titer, zircoure, silica, and ceria.
- the pores formed in the porous ceramic are composed of atmospheric pores having a relatively large pore diameter and small pores having a relatively small pore diameter.
- the thickness of the catalyst support layer is X (/ z m),
- the ratio of the average pore diameter of the atmospheric pores to the average pore diameter of the small pores (the average pore diameter of the atmospheric pores Z and the average pore diameter of the small pores) multiplied by the porosity (%) of the porous ceramic member Is ⁇ 2,
- the thickness of the layer of the catalyst carrier and the like (the average pore diameter of the atmospheric pores minus the average pore diameter of the small pores)
- X the pores of the porous ceramic member
- the small pores are too large and the atmospheric pores are too small. If the small pores are too large, the particulates are deep-filtered in the small pores when the particulates are collected. As the particulate deposition layer becomes thicker, the pressure loss increases.
- the air hole is too small, the gas permeability is poor and the transient pressure loss may be increased. If the air holes are too small, the super-atmospheric holes formed by the close proximity of two or three air holes are less likely to appear, so the gas permeability is higher than when there are super-atmospheric holes. Tend to get worse.
- the thickness of the layer of the catalyst carrier or the like that satisfies the expressions (3) and (4) is in the range of 8.3 to 33 m, as in the cases of the expressions (1) and (2).
- the thickness X of the catalyst carrier layer is less than 8.3 m, the amount of the catalyst carrier is small.
- the dispersibility of the noble metal catalyst is deteriorated and the honeycomb structure does not have sufficient catalyst durability.
- the thickness X of the catalyst carrier layer exceeds 33 m, the catalyst support
- the porosity of the porous ceramic is not particularly limited, but a desirable lower limit is 40% and a desirable upper limit is 75%. If the porosity force is less than 0%, it becomes difficult to increase the proportion of the atmospheric pores, and the effect of forming the atmospheric pores does not appear, while if the porosity exceeds 75%, the mechanical structure of the honeycomb structure It will be difficult to maintain strength.
- the upper limit of the porosity of the porous ceramic is more preferably 65%.
- the porosity can be measured by a conventionally known method such as a mercury intrusion method, an Archimedes method, or a measurement using a scanning electron microscope (SEM).
- the pore diameters of the atmospheric pores constituting the Hercam structure 30 are those having a pore diameter of 30 to LOO ⁇ m observed by SEM, but the pore diameters of the atmospheric pores are desirable.
- the lower limit is 40 ⁇ m. If the average pore diameter of the atmospheric pores is less than 30 m, the pore size of the atmospheric pores is small, so if the layer of the catalyst carrier or the like is a little thicker, the pores are more likely to be clogged, resulting in pressure loss. On the other hand, when the average pore diameter exceeds 100 m, the pore diameter becomes too large, so that the mechanical strength can be sufficiently increased.
- the Hercam structure 10 includes superatmospheric holes whose pore diameters observed by SEM exceed 100 ⁇ m. The effect of reducing the pressure loss is increased.
- the her cam structure 10 includes superatmospheric holes having a diameter of 40 to 90% with respect to the thickness of the wall portion (cell wall) separating the cells of the her cam structure 10. Better ,. If the diameter is less than 0%, the effect of suppressing an increase in pressure loss does not sufficiently appear, and if it exceeds 90%, it becomes difficult to maintain the mechanical strength of the honeycomb structure 10.
- the thickness of the cell wall is preferably 0.6 mm or less, and the diameter of the superatmospheric hole is preferably 540 m or less.
- the air holes formed in the honeycomb structure 10 include superatmospheric holes having a diameter of 65 to 80% with respect to the thickness of the wall portion (cell wall) separating the cells of the honeycomb structure 10. I hope it will be.
- the proportion of superatmospheric pores is preferably 30-80 vol%.
- the pore size of the small pores of the porous ceramic is less than 30 ⁇ m as observed by SEM, but is preferably 5 ⁇ m or more.
- the average pore diameter of the small pores is 30 ⁇ m or more, the small pores become too large, the particulates are filtered through the depth, and the accumulated particulate layer becomes thick, resulting in a large pressure loss.
- the pore size of the small pores is less than 5, the pore size becomes too small, and the pressure loss increases even if the layer of the catalyst carrier or the like is thin.
- a balloon which is a fine hollow sphere containing an acid oxide ceramic as a component And organic particles composed of organic substances such as spherical acrylic particles (eg, resin) and inorganic particles such as graphite.
- the balloon is not particularly limited, and examples thereof include an alumina balloon, a glass micro balloon, a shirasu balloon, a fly ash balloon (FA balloon), and a mullite balloon. Of these, alumina balloons are desirable.
- the particle size of the ceramic used in the production of the Hercam structure 30 is not particularly limited, but it is desirable that the ceramics have less shrinkage in the subsequent firing step, for example, 0.3 to 50 / A combination of 100 parts by weight of powder having an average particle diameter of about ⁇ and 5 to 65 parts by weight of powder having an average particle diameter of about 0.1 to 1.0 m is desirable.
- the porosity and the proportion of pores having a pore diameter of 10 m or less can be controlled to some extent.
- Examples of the pore-forming agent include the same as those mentioned in the first aspect of the present invention.
- the sealing material of the ceramic block 35, the thickness of the partition wall, the material of the sealing material layer, the size and type of the cell, and the like are the same as in the first aspect of the invention, and therefore detailed description thereof is omitted here. To do.
- extrusion molding is performed using a raw material paste mainly composed of the ceramic as described above to produce a cylindrical ceramic molded body that becomes a ceramic block.
- a raw material paste mainly composed of the ceramic as described above
- the shape of the molded body is a cylinder and the size is larger than that of the first invention
- molding is performed in the same manner using the same binder, pore former, dispersion medium, etc. as in the first invention. Since the body is manufactured, the detailed explanation is omitted here.
- the ceramic molded body is used by using a microwave dryer, a hot air dryer, a dielectric dryer, a vacuum dryer, a vacuum dryer, a freeze dryer, or the like. Dry to make a ceramic dry body.
- a predetermined amount of a sealing material paste serving as a sealing material is filled in the outlet side end portion of the inlet side cell group and the inlet side end portion of the outlet side cell group, and the cells are sealed.
- a ceramic block is manufactured by degreasing and firing, a catalyst carrier is attached to the wall, and the catalyst is supported.
- ⁇ -type silicon carbide powder SiC coarse powder
- ⁇ -type silicon carbide powder having an average particle size of 11 m
- 30 parts by weight of ⁇ -type silicon carbide powder having an average particle size of 0.5 m are wet-mixed, and the resulting mixture is 100 parts by weight.
- 10 parts by weight of acrylic particles having an average particle size of 0 m, 5.7 parts by weight of organic binder (methylcellulose), and 26.6 parts by weight of water were added and kneaded to obtain a mixed composition. It was.
- the generated shaped body was dried using a microwave dryer or the like to form a ceramic dried body, and then a sealing material paste having the same composition as that of the generated shaped body was filled in a predetermined cell.
- alumina fiber having a fiber length of 20 ⁇ m, 21% by weight of silicon carbide particles having an average particle diameter of 0.6 ⁇ m, 15% by weight of silica sol, 5.6% by weight of carboxymethylcellulose, and 28.4% of water
- a large number of porous ceramic members 20 were bonded using a heat-resistant adhesive paste containing wt%, and then cut using a diamond cutter to produce a cylindrical ceramic block 15.
- ceramic fiber made of alumina silicate as inorganic fiber shot content: 3%, fiber length: 5 to: ⁇ / ⁇ ⁇ ) 23. 3% by weight, carbonization of inorganic particles with average particle size of 0. Silicon powder 30.2% by weight, silica sol as inorganic binder (content of SiO in sol: 3
- a sealing material paste layer having a thickness of 0.2 mm was formed on the outer peripheral portion of the ceramic block 15 using the sealing material paste. Then, this sealing material paste layer is dried at 120 ° C to produce a cylindrical aggregate type hard structure 10 having a diameter of 143.8 mm and a length of 150 mm.
- ⁇ -alumina was mixed with water and a nitric acid solution as a dispersant, and further pulverized with a ball mill at 90 min _ 1 for 24 hours to prepare an alumina slurry having an average particle diameter of 2 m. Then, the Hercam structure was immersed in the obtained slurry, pulled up, and dried at 200 ° C.
- alumina layer (catalyst support layer) reached a thickness of 10 m and fired at 600 ° C.
- Table 3 shows the average pore size, atmospheric pore size, porosity, (atmospheric pore size Z average pore size) X porosity after catalyst loading.
- FIG. 5 is a plot of the values for each example when the catalyst thickness is taken on the X axis and the value of (atmospheric pore diameter Z average pore diameter) X porosity after catalyst loading is taken on the y axis.
- Table 3 shows the average pore diameter, atmospheric pore diameter, porosity, (atmospheric diameter Z average pore diameter) X porosity, etc. after catalyst loading.
- FIG. 5 is a plot of the values for each example when the catalyst thickness is plotted on the X axis and the value of the (atmospheric pore diameter Z average pore diameter) X porosity after catalyst loading is plotted on the y axis. .
- talc powder with an average particle size of 10 ⁇ m 10 parts by weight of kaolin powder with an average particle size of 9 ⁇ m, 17 parts by weight of alumina powder with an average particle size of 9.5 m, and water with an average particle size of 5 m 16 parts by weight of acid mineral powder and 15 parts by weight of silica powder having an average particle size of 10 m are wet-mixed, and 10 parts of acrylic particles having an average particle diameter of 0 m are added to 98 parts by weight of the resulting mixture.
- the generated shaped body was dried using a microwave dryer or the like to form a ceramic dried body, and then a sealing material paste having the same composition as that of the generated shaped body was filled in a predetermined cell.
- a sealing material paste having the same composition as that of the generated shaped body was filled in a predetermined cell.
- a cylindrical honeycomb structure 30 made of Wright was manufactured. When the particle size of the ceramic particles in the hard cam structure 30 was observed by SEM, it was 10 ⁇ m.
- the Hercam structure 30 was dipped in an alumina slurry having an average particle diameter of 2 ⁇ m prepared in the same manner as in Example 1, pulled up, and dried at 200 ° C.
- alumina layer (catalyst support layer) reached a thickness of 10 m and fired at 600 ° C.
- platinum concentration 4. 53 weight 0/0 dinitrodiammine platinum nitrate ([Pt (NH) (NO )] HNO)
- Table 3 shows the average pore size, atmospheric pore size, porosity, (atmospheric pore size Z average pore size) X porosity after catalyst loading.
- FIG. 5 is a plot of the values for each example when the catalyst thickness is taken on the X axis and the value of (atmospheric pore diameter Z average pore diameter) X porosity after catalyst loading is taken on the y axis.
- a molded body When forming a molded body, the components as shown in Table 2 were mixed to form a mixed composition, and a molded body was prepared by extrusion molding. The body 30 was manufactured, and a catalyst supporting layer having a thickness as shown in Table 3 was attached to the resulting her cam structure 30 to support the catalyst.
- Table 3 shows the average pore size, atmospheric pore size, porosity, (atmospheric pore size Z average pore size) X porosity after catalyst loading.
- FIG. 5 is a plot of the values for each example when the catalyst thickness is taken on the X axis and the value of (atmospheric pore diameter Z average pore diameter) X porosity after catalyst loading is taken on the y axis.
- porous ceramic member used in each example and comparative example was cut out at about 1 cm square, placed in a plastic container, further degassed with an epoxy resin hardener, and then allowed to stand at normal pressure.
- the cured epoxy resin-containing sample was polished with a diamond disk so that the wall section of the porous ceramic member appeared on the surface.
- the sample prepared in this way is observed with a scanning electron micrograph (SEM) of 100 pores and small pores in the porous ceramic member, the diameters are measured, and the average value is measured in the atmosphere.
- the pore diameter and small pore diameter were used.
- the lengths of the major and minor axes of the pores were measured, and the length of the major axis was taken as the pore diameter.
- the aspect ratio of the major axis and minor axis length was calculated.
- the honeycomb structure to which the catalyst supporting layer according to each of the examples and the comparative examples was attached was processed in the same manner, and the portion where the thickness could be measured by SEM, 100 locations were observed, and the average value was defined as the thickness of the catalyst supporting layer. .
- the pore size of the small pores was used as the catalyst layer. The results are shown in Table 3 below.
- the porosity was measured by the Archimedes method for the Hercam structures according to each Example and Comparative Example. The results are shown in Table 3 below.
- honeycomb structures according to the respective examples, reference examples and comparative examples were placed in a pine furnace and heat-treated at 800 ° C. for 10 hours. Thereafter, disposed in an exhaust oven engine, as an exhaust gas Kiyoshii spoon device, ha - after placing the thermometer in the center of the cam structure, the rotation speed 3000 min _1 the engine, the particulates in the torque 50 Nm 8 g / L was collected.
- Example 1 20 90 Yes 2 or more 60 30 10 18 85 58 273.89 91 16 24
- Example 2 20 90 Yes 2 or more 60 60 15 17 90 57 301.76 93 18 24
- Example 3 20 90 Yes 2 or more 60 90 20 15 90 55 330.00 96 20 26
- Example 4 20 90 Yes 2 or more 60 120 25 14 80 49 280.00 98 22 27
- Example 5 20 90 Yes 2 or more 60 150 30 13 80 45 276.92 96 24 28
- Example 6 25 100 Yes 2 or more 65 90 20 22 90 55 225.00 97 18 20
- Example 7 25 100 Yes 2 or more 65 120 25 19 90 50 236.84 97 20 20
- Example 8 18 80 Yes 2 or more 60 30 15 15 80 56 298.67 90 18 28
- Example 9 20 90 Yes 2 or more 60 30 10 18 85 59 278.61 90 10
- Example 10 20 90 Yes 2 or more 60 90 17 17 80 57 268.24 93 16 10 Compar
- FIG. 1 is a perspective view schematically showing an example of a her cam structure of the first present invention.
- FIG. 2 (a) is a perspective view schematically showing a porous ceramic member constituting the her cam structure of the first invention, and (b) is a cross-sectional view taken along line AA.
- FIG. 2 (a) is a perspective view schematically showing a porous ceramic member constituting the her cam structure of the first invention, and (b) is a cross-sectional view taken along line AA.
- FIG. 3 is a cross-sectional view schematically showing an example of an exhaust gas purifying device for a vehicle provided with the her cam structure of the present invention.
- FIG. 4 (a) is a cross-sectional view schematically showing the second structure of the present invention, and (b) is a cross-sectional view taken along the line BB.
- FIG. 5 is a graph showing the relationship between the thickness of the catalyst carrier layer and the value obtained by multiplying the ratio of (atmospheric pore diameter Z small pore diameter) by the porosity.
- FIG. 6 is a SEM photograph showing the result of observing pores formed in the cell wall by SEM after cutting the cell wall.
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Abstract
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP05809600A EP1818098A4 (en) | 2004-11-26 | 2005-11-25 | hONEYCOMB STRUCTURE |
| JP2006547860A JP5142532B2 (ja) | 2004-11-26 | 2005-11-25 | ハニカム構造体 |
| US11/513,149 US7540898B2 (en) | 2004-11-26 | 2006-08-31 | Honeycomb structured body |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004-343042 | 2004-11-26 | ||
| JP2004343042 | 2004-11-26 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US11/513,149 Continuation US7540898B2 (en) | 2004-11-26 | 2006-08-31 | Honeycomb structured body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2006057344A1 true WO2006057344A1 (ja) | 2006-06-01 |
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ID=36498077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2005/021697 Ceased WO2006057344A1 (ja) | 2004-11-26 | 2005-11-25 | ハニカム構造体 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US7540898B2 (ja) |
| EP (1) | EP1818098A4 (ja) |
| JP (1) | JP5142532B2 (ja) |
| WO (1) | WO2006057344A1 (ja) |
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Cited By (14)
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| US7438967B2 (en) | 2005-02-04 | 2008-10-21 | Ibiden Co., Ltd. | Ceramic honeycomb structural body |
| US7803312B2 (en) | 2005-02-04 | 2010-09-28 | Ibiden Co., Ltd. | Ceramic honeycomb structural body and method of manufacturing the same |
| US7824629B2 (en) | 2005-08-26 | 2010-11-02 | Ibiden Co., Ltd. | Honeycomb structure and manufacturing method for honeycomb structure |
| US7550026B2 (en) | 2005-09-28 | 2009-06-23 | Ibiden Co., Ltd. | Honeycomb filter |
| US7883759B2 (en) | 2006-01-27 | 2011-02-08 | Ibiden Co., Ltd. | Honeycomb structure and method for manufacturing honeycomb structure |
| US7732366B2 (en) | 2006-02-23 | 2010-06-08 | Ibiden Co., Ltd. | Honeycomb structure and exhaust gas purifying device |
| JP2009000663A (ja) * | 2007-06-25 | 2009-01-08 | Honda Motor Co Ltd | 排ガス浄化フィルタ及びその製造方法 |
| JP2011525579A (ja) * | 2008-02-05 | 2011-09-22 | ビー・エイ・エス・エフ、コーポレーション | 微粒子トラップを有するガソリンエンジン排出ガス処理システム |
| JP2011121051A (ja) * | 2009-11-13 | 2011-06-23 | Fujifilm Corp | 凹凸構造体及びその製造方法 |
| JP2013184088A (ja) * | 2012-03-06 | 2013-09-19 | Cataler Corp | 担持触媒製造用組成物 |
| JP2014104421A (ja) * | 2012-11-27 | 2014-06-09 | Ngk Insulators Ltd | ハニカム触媒体 |
| CN113262582A (zh) * | 2015-11-30 | 2021-08-17 | 康宁股份有限公司 | 复合蜂窝主体、尾气处理制品、排放系统及其制造方法 |
| CN113262582B (zh) * | 2015-11-30 | 2022-09-20 | 康宁股份有限公司 | 复合蜂窝主体、尾气处理制品、排放系统及其制造方法 |
| WO2024204078A1 (ja) * | 2023-03-30 | 2024-10-03 | 三井金属鉱業株式会社 | 排ガス浄化用触媒 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1818098A4 (en) | 2008-02-06 |
| EP1818098A1 (en) | 2007-08-15 |
| JP5142532B2 (ja) | 2013-02-13 |
| JPWO2006057344A1 (ja) | 2008-06-05 |
| US7540898B2 (en) | 2009-06-02 |
| US20070044444A1 (en) | 2007-03-01 |
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