WO2018229214A1 - Combined soot filter and urea hydrolysis - Google Patents

Combined soot filter and urea hydrolysis Download PDF

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Publication number
WO2018229214A1
WO2018229214A1 PCT/EP2018/065856 EP2018065856W WO2018229214A1 WO 2018229214 A1 WO2018229214 A1 WO 2018229214A1 EP 2018065856 W EP2018065856 W EP 2018065856W WO 2018229214 A1 WO2018229214 A1 WO 2018229214A1
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WIPO (PCT)
Prior art keywords
exhaust gas
filter unit
catalyst
section
monolith
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2018/065856
Other languages
French (fr)
Inventor
Paer Gabrielsson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Umicore AG and Co KG
Original Assignee
Umicore AG and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Umicore AG and Co KG filed Critical Umicore AG and Co KG
Priority to CN201880028481.3A priority Critical patent/CN110636893A/en
Priority to US16/622,921 priority patent/US11033858B2/en
Priority to EP18732716.8A priority patent/EP3638405A1/en
Publication of WO2018229214A1 publication Critical patent/WO2018229214A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9459—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts
    • B01D53/9463—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on one brick
    • B01D53/9472—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on one brick in different zones
    • 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
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • B01D53/9413—Processes characterised by a specific catalyst
    • B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
    • 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
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/944—Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts
    • 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
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9459—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts
    • B01D53/9477—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on separate bricks, e.g. exhaust systems
    • 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
    • B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
    • B01J21/02—Boron or aluminium; Oxides or hydroxides thereof
    • B01J21/04—Alumina
    • 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
    • B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
    • B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
    • B01J21/063—Titanium; Oxides or hydroxides thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
    • B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
    • B01J21/066—Zirconium or hafnium; Oxides or hydroxides thereof
    • 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
    • B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
    • B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
    • B01J21/08—Silica
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
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    • B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
    • B01J23/42—Platinum
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
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    • B01J29/00—Catalysts comprising molecular sieves
    • B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/40—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/19—Catalysts containing parts with different compositions
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • 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
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features
    • F01N13/16—Selection of particular materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • 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
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    • 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
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    • 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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    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
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    • F01N3/106—Auxiliary oxidation catalysts
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    • 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
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    • F01N3/18—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 methods of operation; Control
    • F01N3/20—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 methods of operation; Control specially adapted for catalytic conversion
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • F01N3/2066—Selective catalytic reduction [SCR]
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    • 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
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D2255/1021—Platinum
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    • B01D2255/1023—Palladium
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/80—Type of catalytic reaction
    • B01D2255/808—Hydrolytic
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B01D—SEPARATION
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    • B01D2255/903—Multi-zoned catalysts
    • B01D2255/9032—Two zones
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B01D2255/915—Catalyst supported on particulate filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/40—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a hydrolysis catalyst
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    • F01N2370/00—Selection of materials for exhaust purification
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    • F01N2510/00—Surface coverings
    • F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
    • F01N2510/068—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings
    • F01N2510/0682—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings having a discontinuous, uneven or partially overlapping coating of catalytic material, e.g. higher amount of material upstream than downstream or vice versa
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    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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
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    • 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

Definitions

  • the present invention is a system to integrate a Urea De ⁇ composition Particle Filter (UDPF) and a Catalyst Diesel Particle Filter (CDPF) , especially for exhaust gas clean ⁇ ing .
  • UDPF Urea De ⁇ composition Particle Filter
  • CDPF Catalyst Diesel Particle Filter
  • the invention addresses the problem of complexity and bulk- iness of exhaust gas cleaning systems.
  • the present inven- tion presents a more compact and less complex exhaust gas cleaning system.
  • urea hydrolysis mix ⁇ er which is a special tube in which the urea is evaporated and partly decomposed and thereafter hydrolysed on the SCR catalyst.
  • the urea is hydrolysed to two ammonia molecules directly in the UDPF part of the filter with a fraction of the exhaust gas, while, another fraction of the exhaust gas is passed through the CDPF part of the filter where NO is reacted to N02.
  • the UDPF could be coated with a urea hydrolysis cata ⁇ lyst, but even without coating, the monolith has some hy ⁇ drolysis activity.
  • a urea spray is directed towards the UDPF fraction area of the filter; this may be enabled using a shield or a guide for the urea spray.
  • the N02 produced in the CDPF fraction of the filter is not used for soot filter regeneration, but for improving the low temperature performance of the SCR (Selective Catalytic Reduction) catalyst located downstream the filter.
  • a mixer may be located upstream the SCR cata ⁇ lyst and downstream the UDPF/CDPF to improve a homogenous mix of the NH3 and N02 exiting the UDPF/CDPF.
  • the invention is useful for the cleaning of exhaust gas of an engine, for instance, but not exclusively diesel engine exhaust .
  • the invention provides a catalyst impregnated exhaust gas particulate filter unit which is suited for vehicle exhaust gas cleaning.
  • the unit comprises at least one monolith which comprises a plurality of channels.
  • the channels are open at one end, to let the exhaust gas in, but closed at the other end, to force the exhaust gas through the filter wall of the mono ⁇ lith to exit the unit, thereby filtering the exhaust gas.
  • the monolith itself has two open ends, a first end for the exhaust gas to enter and a second end which the exhaust gas exits after it has been filtered through the filter wall of the monolith.
  • the filter unit further comprises at least one wall adapted to fit around the at least one monolith.
  • Essential for the invention is, that the at least one mono ⁇ lith is divided in two sections.
  • the first section, the UDPF is particularly adapted to facilitate the urea hydrol- ysis to two ammonia molecules directly as described above.
  • This first section may be coated with a first type of cata ⁇ lyst which is suited for the urea hydrolysis, but it may also not be coated, because ceramics of the filter may help the hydrolysis of urea.
  • hydrolysis catalysts are: Zr02, Ti02, A1203, H-ZSM-5 or Si02.
  • the second sec ⁇ tion, the CDPF, of the at least one monolith is coated with a second type of catalyst which is suited for the reaction of NO to N02.
  • this second type of cata ⁇ lyst is a diesel oxidation catalyst.
  • Examples of diesel ox ⁇ idation catalysts are: Pt/A1203; (Pt, Pd)/A1203; Pt/Ti02; (Pt, Pd)/Ti02; 0-50 g/ft3; precious metals.
  • the filter unit has a cylindrical shape and the first section has the shape of a sector of a circle when seen in a cross sectional view of the filter unit.
  • the impregnation of the filter with catalyst may be performed by screening the section of the filter which is not to be impregnated.
  • the first section may have the shape of a segment of a circle or it may have the shape of a cir ⁇ cle, within the outer circle of the filter unit cross sec- tional viewed.
  • the filter unit comprises a flow guide which is located upstream of the first section.
  • the flow guide is adapted to guide a part of the exhaust gas stream only to the first section and iso ⁇ late this part of the exhaust gas stream from the rest of the exhaust gas stream flowing to the one or more monolith.
  • urea may be injected to the part of the exhaust gas stream flowing within the flow guide.
  • the flow guide provides more exact di ⁇ recting of the injected urea to the first (UDPF) section of the at least one monolith.
  • the flow guide may be in the form of a duct or a pipe.
  • the filter unit comprises a mixer arranged downstream of the at least one monolith (comprising the first and second section) . The mixer is adapted to mix the exhaust gas stream from the first and the second section.
  • the monoliths may be arranged in serial or parallel connection relative to the fluid flow through the filter unit. Consequently, when the monoliths are parallel connected in the filter unit, they are arranged side by side over the inner cross sectional area of the filter unit relative to the fluid flow direction from the first to the second open end of the filter unit. When the monoliths are serial connected, they are arranged one after the other in the fluid flow direction. It is also possible that the plu ⁇ rality of monoliths are arranged both serial and parallel within the filter unit, i.e. both side by side across the cross sectional area of the filter unit and one after the other in the fluid flow direction.
  • the filter unit comprises at least one wall which is adapted to fit around the one or more monolith (s) .
  • the number of walls depends on the shape of the filter unit.
  • a filter unit with a circular or ellipsoid cross sectional shape comprises a single monolith surrounding wall, whereas a filter unit with a rectangular cross sectional shape comprises four walls and a filter unit with a triangular cross sectional shape comprises three walls.
  • Catalyst impregnated exhaust gas particulate filter unit for vehicle exhaust gas the unit comprises
  • the at least one monolith is divided in two sections, a first section which is not coated or which is coated with a first type of catalyst and a second section which is coated with a second type of catalyst.
  • Catalyst impregnated exhaust gas particulate filter unit according to feature 1 wherein the first type of catalyst is a urea hydrolysis catalyst.
  • Catalyst impregnated exhaust gas particulate filter unit according to any of the preceding features, wherein the second type of catalyst is a diesel oxidation catalyst.
  • Catalyst impregnated exhaust gas particulate filter unit according to any of the preceding features, wherein the filter unit has a cylindrical shape and the first section has the shape of a sector of a circle when seen in a cross sectional view of the filter unit.
  • Catalyst impregnated exhaust gas particulate filter unit according to any of the features 1-3, wherein the filter unit has a cylindrical shape and the first section has the shape of a segment of a circle when seen in a cross sec ⁇ tional view of the filter unit.
  • Catalyst impregnated exhaust gas particulate filter unit according to any of the features 1-3, wherein the first section has the shape of a circle when seen in a cross sec ⁇ tional view of the filter unit. 7. Catalyst impregnated exhaust gas particulate filter unit according to any of the preceding features, wherein the unit further comprises a flow guide upstream the first sec ⁇ tion adapted to guide a part of the exhaust gas stream only to the first section and isolate this part of the exhaust gas stream from the rest of the exhaust gas stream.
  • a catalyst impregnated exhaust gas particu ⁇ late filter unit for vehicle exhaust gas comprising at least one monolith comprising a plurality of channels open at one end and closed at the other end, a first open end, a second open end, at least one wall adapted to fit around said at least one monolith, wherein the at least one monolith is divided in two sections, a first section which is not coated or which is coated with a first type of catalyst and a second section which is coated with a second type of catalyst,
  • Process according to feature 9 further including the step of providing a fluid guide upstream the first section of the at least one monolith for the partial stream, adapted to guide the partial stream to the first section of the at least one monolith.
  • Fig. 1 shows an isometric view of the filter unit upstream an SCR catalyst unit
  • Fig. 2 shows a graph of the performance of the invention.
  • Second section (CDPF) of the monolith (s) a filter unit 01 according to an embodiment of the invention is shown with the monolith inside it.
  • the filter unit of this embodiment has one cylindrical cassette wall not shown adapted to enclose the sides of the monolith to be mounted inside it and to fix the monolith against movement relative to the wall.
  • the monolith is mounted within the wall, it is adapted to receive an ex ⁇ haust gas to be cleaned in the monolith.
  • the monolith is separated in two sections. In the first section 03 a sector of the cross sectional area of the cylindrical monolith is the UDPF. In the second section 04, the rest of the mono ⁇ lith is the CDPF.
  • the exhaust gas enters the filter unit through the first open end.
  • One stream of exhaust gas with urea injected enters the first section and another stream of exhaust gas comprising NO enters the second section.
  • the gas streams flows into the monolith which comprises a plu ⁇ rality of channels with a closed end, hence, the gas streams flows through the filter sides of the monolith to exit through the second open end of the filter unit in a gas stream comprising ammonia and N02.
  • a mixer (not shown) may be employed downstream the filter unit and upstream the SCR.

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  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
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Abstract

A monolith filter unit for exhaust gas cleaning combines urea hydrolysis with particle filtering.

Description

Combined Soot Filter and Urea Hydrolysis
The present invention is a system to integrate a Urea De¬ composition Particle Filter (UDPF) and a Catalyst Diesel Particle Filter (CDPF) , especially for exhaust gas clean¬ ing .
The invention addresses the problem of complexity and bulk- iness of exhaust gas cleaning systems. The present inven- tion presents a more compact and less complex exhaust gas cleaning system.
Today truck manufacturers are using a urea hydrolysis mix¬ er, which is a special tube in which the urea is evaporated and partly decomposed and thereafter hydrolysed on the SCR catalyst. In the filter of the present invention, the urea is hydrolysed to two ammonia molecules directly in the UDPF part of the filter with a fraction of the exhaust gas, while, another fraction of the exhaust gas is passed through the CDPF part of the filter where NO is reacted to N02. The UDPF could be coated with a urea hydrolysis cata¬ lyst, but even without coating, the monolith has some hy¬ drolysis activity. Up-stream the UDPF filter fraction, a urea spray is directed towards the UDPF fraction area of the filter; this may be enabled using a shield or a guide for the urea spray. The N02 produced in the CDPF fraction of the filter is not used for soot filter regeneration, but for improving the low temperature performance of the SCR (Selective Catalytic Reduction) catalyst located downstream the filter. A mixer may be located upstream the SCR cata¬ lyst and downstream the UDPF/CDPF to improve a homogenous mix of the NH3 and N02 exiting the UDPF/CDPF. The invention is useful for the cleaning of exhaust gas of an engine, for instance, but not exclusively diesel engine exhaust .
The invention provides a catalyst impregnated exhaust gas particulate filter unit which is suited for vehicle exhaust gas cleaning. According to an embodiment of the invention, the unit comprises at least one monolith which comprises a plurality of channels. The channels are open at one end, to let the exhaust gas in, but closed at the other end, to force the exhaust gas through the filter wall of the mono¬ lith to exit the unit, thereby filtering the exhaust gas. The monolith itself has two open ends, a first end for the exhaust gas to enter and a second end which the exhaust gas exits after it has been filtered through the filter wall of the monolith. To enclose the monolith, protecting it and enabling it to be mounted in an exhaust gas system, the filter unit further comprises at least one wall adapted to fit around the at least one monolith.
Essential for the invention is, that the at least one mono¬ lith is divided in two sections. The first section, the UDPF is particularly adapted to facilitate the urea hydrol- ysis to two ammonia molecules directly as described above.
This first section may be coated with a first type of cata¬ lyst which is suited for the urea hydrolysis, but it may also not be coated, because ceramics of the filter may help the hydrolysis of urea. Examples of hydrolysis catalysts are: Zr02, Ti02, A1203, H-ZSM-5 or Si02. The second sec¬ tion, the CDPF, of the at least one monolith is coated with a second type of catalyst which is suited for the reaction of NO to N02. In one embodiment this second type of cata¬ lyst is a diesel oxidation catalyst. Examples of diesel ox¬ idation catalysts are: Pt/A1203; (Pt, Pd)/A1203; Pt/Ti02; (Pt, Pd)/Ti02; 0-50 g/ft3; precious metals.
In an embodiment of the invention, the filter unit has a cylindrical shape and the first section has the shape of a sector of a circle when seen in a cross sectional view of the filter unit. In this embodiment, the impregnation of the filter with catalyst may be performed by screening the section of the filter which is not to be impregnated. In further embodiments, the first section may have the shape of a segment of a circle or it may have the shape of a cir¬ cle, within the outer circle of the filter unit cross sec- tional viewed.
In a further embodiment of the invention, the filter unit comprises a flow guide which is located upstream of the first section. The flow guide is adapted to guide a part of the exhaust gas stream only to the first section and iso¬ late this part of the exhaust gas stream from the rest of the exhaust gas stream flowing to the one or more monolith. Just before or within the flow guide, urea may be injected to the part of the exhaust gas stream flowing within the flow guide. Hence, the flow guide provides more exact di¬ recting of the injected urea to the first (UDPF) section of the at least one monolith. The flow guide may be in the form of a duct or a pipe. In a further embodiment of the invention the filter unit comprises a mixer arranged downstream of the at least one monolith (comprising the first and second section) . The mixer is adapted to mix the exhaust gas stream from the first and the second section.
In embodiments where the filter unit comprises a plurality of monoliths, the monoliths may be arranged in serial or parallel connection relative to the fluid flow through the filter unit. Consequently, when the monoliths are parallel connected in the filter unit, they are arranged side by side over the inner cross sectional area of the filter unit relative to the fluid flow direction from the first to the second open end of the filter unit. When the monoliths are serial connected, they are arranged one after the other in the fluid flow direction. It is also possible that the plu¬ rality of monoliths are arranged both serial and parallel within the filter unit, i.e. both side by side across the cross sectional area of the filter unit and one after the other in the fluid flow direction. The filter unit comprises at least one wall which is adapted to fit around the one or more monolith (s) . The number of walls depends on the shape of the filter unit. A filter unit with a circular or ellipsoid cross sectional shape comprises a single monolith surrounding wall, whereas a filter unit with a rectangular cross sectional shape comprises four walls and a filter unit with a triangular cross sectional shape comprises three walls.
Features of the invention
1. Catalyst impregnated exhaust gas particulate filter unit for vehicle exhaust gas, the unit comprises
• at least one monolith comprising a plurality of chan¬ nels open at one end and closed at the other end, • a first open end,
a second open end, wherein the at least one monolith is divided in two sections, a first section which is not coated or which is coated with a first type of catalyst and a second section which is coated with a second type of catalyst.
2. Catalyst impregnated exhaust gas particulate filter unit according to feature 1, wherein the first type of catalyst is a urea hydrolysis catalyst.
3. Catalyst impregnated exhaust gas particulate filter unit according to any of the preceding features, wherein the second type of catalyst is a diesel oxidation catalyst.
4. Catalyst impregnated exhaust gas particulate filter unit according to any of the preceding features, wherein the filter unit has a cylindrical shape and the first section has the shape of a sector of a circle when seen in a cross sectional view of the filter unit.
5. Catalyst impregnated exhaust gas particulate filter unit according to any of the features 1-3, wherein the filter unit has a cylindrical shape and the first section has the shape of a segment of a circle when seen in a cross sec¬ tional view of the filter unit.
6. Catalyst impregnated exhaust gas particulate filter unit according to any of the features 1-3, wherein the first section has the shape of a circle when seen in a cross sec¬ tional view of the filter unit. 7. Catalyst impregnated exhaust gas particulate filter unit according to any of the preceding features, wherein the unit further comprises a flow guide upstream the first sec¬ tion adapted to guide a part of the exhaust gas stream only to the first section and isolate this part of the exhaust gas stream from the rest of the exhaust gas stream.
8. Catalyst impregnated exhaust gas particulate filter unit according to any of the preceding features, wherein the filter unit further comprises a mixer arranged downstream the first and second section adapted to mix the exhaust gas stream from the first section with the exhaust gas stream from the second section. 9. Process for vehicle exhaust gas cleaning comprising the steps of
• providing a catalyst impregnated exhaust gas particu¬ late filter unit for vehicle exhaust gas comprising at least one monolith comprising a plurality of channels open at one end and closed at the other end, a first open end, a second open end, at least one wall adapted to fit around said at least one monolith, wherein the at least one monolith is divided in two sections, a first section which is not coated or which is coated with a first type of catalyst and a second section which is coated with a second type of catalyst,
• providing a vehicle exhaust gas upstream the first
open end of the unit
• injecting urea into a partial stream of the vehicle exhaust gas, upstream the first section of the at least one monolith. 10. Process according to feature 9, further including the step of providing a fluid guide upstream the first section of the at least one monolith for the partial stream, adapted to guide the partial stream to the first section of the at least one monolith.
11. Process according to feature 9 or 10, further including the step of providing a mixer downstream the filter unit and mixing the flow of fluids comprising N02 and NH3 exit¬ ing the first and the second section of the filter unit.
12. Process according to any of the features 9 - 11, fur¬ ther including the step of providing an SCR unit downstream the filter unit.
A more detailed description of the invention will be apparent from the following description of a specific embodiment with reference to the drawings in which -
Fig. 1 shows an isometric view of the filter unit upstream an SCR catalyst unit, and
Fig. 2 shows a graph of the performance of the invention. Position numbers
01. Filter unit .
02. SCR catalyst unit
03. First section (UDPF) of the monolith(s).
04. Second section (CDPF) of the monolith (s) . Referring to Fig. 1, a filter unit 01 according to an embodiment of the invention is shown with the monolith inside it. The filter unit of this embodiment has one cylindrical cassette wall not shown adapted to enclose the sides of the monolith to be mounted inside it and to fix the monolith against movement relative to the wall. When the monolith is mounted within the wall, it is adapted to receive an ex¬ haust gas to be cleaned in the monolith. The monolith is separated in two sections. In the first section 03 a sector of the cross sectional area of the cylindrical monolith is the UDPF. In the second section 04, the rest of the mono¬ lith is the CDPF. The exhaust gas enters the filter unit through the first open end. One stream of exhaust gas with urea injected enters the first section and another stream of exhaust gas comprising NO enters the second section. The gas streams flows into the monolith which comprises a plu¬ rality of channels with a closed end, hence, the gas streams flows through the filter sides of the monolith to exit through the second open end of the filter unit in a gas stream comprising ammonia and N02. To homogenize the gas exiting the filter unit before it enters the SCR, a mixer (not shown) may be employed downstream the filter unit and upstream the SCR. Fig. 2 shows how experiments have shown a higher NOX con¬ version when the urea is injected into the exhaust gas stream before the (U) DPF as according to the present inven¬ tion than if the urea is injected into the exhaust gas stream before the SCR (downstream the UDPF) .

Claims

Claims :
1. Catalyst impregnated exhaust gas particulate filter unit for vehicle exhaust gas, the unit comprises
· at least one monolith comprising a plurality of chan¬ nels open at one end and closed at the other end,
• a first open end,
• a second open end,
wherein the at least one monolith is divided in two sec- tions, a first section which is not coated or which is coated with a first type of catalyst and a second section which is coated with a second type of catalyst.
2. Catalyst impregnated exhaust gas particulate filter unit according to claim 1, wherein the first type of catalyst is a urea hydrolysis catalyst.
3. Catalyst impregnated exhaust gas particulate filter unit according to claim 2, wherein the urea hydrolysis catalyst is at least one of Zr02, Ti02, A1203, H-ZSM-5 or Si02.
4. Catalyst impregnated exhaust gas particulate filter unit according to any of the preceding claims, wherein the second type of catalyst is a diesel oxidation catalyst.
5. Catalyst impregnated exhaust gas particulate filter unit according to claim 4, wherein the diesel oxidation catalyst is at least one of Pt/A1203; (Pt, Pd)/A1203; Pt/Ti02; (Pt, Pd)/Ti02; 0-50 g/ft3 or precious metals.
6. Catalyst impregnated exhaust gas particulate filter unit according to any of the preceding claims, wherein the fil- ter unit has a cylindrical shape and the first section has the shape of a sector of a circle when seen in a cross sec¬ tional view of the filter unit.
7. Catalyst impregnated exhaust gas particulate filter unit according to any of the claims 1-5, wherein the filter unit has a cylindrical shape and the first section has the shape of a segment of a circle when seen in a cross sectional view of the filter unit.
8. Catalyst impregnated exhaust gas particulate filter unit according to any of the claims 1-5, wherein the first sec¬ tion has the shape of a circle when seen in a cross sec¬ tional view of the filter unit.
9. Catalyst impregnated exhaust gas particulate filter unit according to any of the preceding claims, wherein the unit further comprises a flow guide upstream the first section adapted to guide a part of the exhaust gas stream only to the first section and isolate this part of the exhaust gas stream from the rest of the exhaust gas stream.
10. Catalyst impregnated exhaust gas particulate filter unit according to any of the preceding claims, wherein the filter unit further comprises a mixer arranged downstream the first and second section adapted to mix the exhaust gas stream from the first section with the exhaust gas stream from the second section.
11. Process for vehicle exhaust gas cleaning comprising the steps of • providing a catalyst impregnated exhaust gas particu¬ late filter unit for vehicle exhaust gas comprising at least one monolith comprising a plurality of channels open at one end and closed at the other end, a first open end, a second open end, at least one wall adapted to fit around said at least one monolith, wherein the at least one monolith is divided in two sections, a first section which is not coated or which is coated with a first type of catalyst and a second section which is coated with a second type of catalyst,
• providing a vehicle exhaust gas upstream the first
open end of the unit
• injecting urea into a partial stream of the vehicle exhaust gas, upstream the first section of the at least one monolith.
12. Process according to claim 11, further including the step of providing a fluid guide upstream the first section of the at least one monolith for the partial stream, adapted to guide the partial stream to the first section of the at least one monolith.
13. Process according to claim 11 or 12, further including the step of providing a mixer downstream the filter unit and mixing the flow of fluids comprising N02 and NH3 exit¬ ing the first and the second section of the filter unit.
14. Process according to any of the claims 11 - 13, further including the step of providing an SCR unit downstream the filter unit.
PCT/EP2018/065856 2017-06-16 2018-06-14 Combined soot filter and urea hydrolysis Ceased WO2018229214A1 (en)

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US16/622,921 US11033858B2 (en) 2017-06-16 2018-06-14 Combined soot filter and urea hydrolysis
EP18732716.8A EP3638405A1 (en) 2017-06-16 2018-06-14 Combined soot filter and urea hydrolysis

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US11033858B2 (en) 2021-06-15
EP3638405A1 (en) 2020-04-22
US20210146305A1 (en) 2021-05-20

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