EP4096811A1 - Catalyseur à trois voies double couche présentant une meilleure stabilité au vieillissement - Google Patents

Catalyseur à trois voies double couche présentant une meilleure stabilité au vieillissement

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Publication number
EP4096811A1
EP4096811A1 EP21703381.0A EP21703381A EP4096811A1 EP 4096811 A1 EP4096811 A1 EP 4096811A1 EP 21703381 A EP21703381 A EP 21703381A EP 4096811 A1 EP4096811 A1 EP 4096811A1
Authority
EP
European Patent Office
Prior art keywords
layer
zirconium
oxide
cerium
lanthanum
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.)
Pending
Application number
EP21703381.0A
Other languages
German (de)
English (en)
Inventor
Joel DESPRES
Martin Roesch
Joerg-Michael Richter
Carolin BRAUN
Marcus Schmidt
Nicole SCHICHTEL
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
Publication of EP4096811A1 publication Critical patent/EP4096811A1/fr
Pending legal-status Critical Current

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Classifications

    • 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
    • B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
    • B01D53/945—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific catalyst
    • 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
    • B01J21/066—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
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/10—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of rare earths
    • 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
    • B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
    • B01J23/44—Palladium
    • 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
    • B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
    • B01J23/46—Ruthenium, rhodium, osmium or iridium
    • B01J23/464—Rhodium
    • 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
    • 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
    • B01J35/19—Catalysts containing parts with different compositions
    • 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
    • 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
    • B01J37/0244—Coatings comprising several layers
    • 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
    • F01N3/101—Three-way catalysts
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/10—Noble metals or compounds thereof
    • B01D2255/102—Platinum group metals
    • B01D2255/1021—Platinum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/10—Noble metals or compounds thereof
    • B01D2255/102—Platinum group metals
    • B01D2255/1023—Palladium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/10—Noble metals or compounds thereof
    • B01D2255/102—Platinum group metals
    • B01D2255/1025—Rhodium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/206—Rare earth metals
    • B01D2255/2061—Yttrium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/206—Rare earth metals
    • B01D2255/2063—Lanthanum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/206—Rare earth metals
    • B01D2255/2065—Cerium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20715—Zirconium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/209—Other metals
    • B01D2255/2092—Aluminium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/40—Mixed oxides
    • B01D2255/407—Zr-Ce mixed oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/90—Physical characteristics of catalysts
    • B01D2255/902—Multilayered catalyst
    • B01D2255/9022—Two layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/90—Physical characteristics of catalysts
    • B01D2255/908—O2-storage component incorporated in the catalyst
    • 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
    • F01N2370/00—Selection of materials for exhaust purification
    • F01N2370/02—Selection of materials for exhaust purification used in catalytic reactors
    • 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

Definitions

  • the present invention relates to a three-way catalytic converter which is composed of two superposed, catalytically active layers and which is suitable for cleaning the exhaust gases of internal combustion engines.
  • Three-way catalytic converters are used to purify the exhaust gases from internal combustion engines that are essentially operated stoichiometrically.
  • the amount of air supplied to the engine corresponds exactly to the amount required to completely burn the fuel.
  • the combustion air ratio l also known as the air number, is exactly 1.
  • the catalytically active materials used are platinum group metals, in particular platinum, palladium and rhodium, which are present, for example, on g-aluminum oxide as a carrier material.
  • three-way catalytic converters contain oxygen storage materials, for example cerium / zirconium mixed oxides. In the latter, cerium oxide, a rare earth metal oxide, is the fundamental component for oxygen storage. In addition to zirconium oxide and cerium oxide, these materials can contain additional components such as other rare earth metal oxides or alkaline earth metal oxides. Oxygen storage materials are activated by applying catalytically active materials such as platinum group metals and thus also serve as a carrier material for the platinum group metals.
  • a three-way catalyst can be present in a single coating layer on an inert catalyst support, see for example EP1541220B1.
  • double-layer catalysts are used, which enable different catalytic processes to be separated and thus optimal coordination of the catalytic effects in the two layers.
  • Catalysts of the latter type are for example in W095 / 35152A1, W02008 / 000449A2, EP0885650A2, EP1046423A2,
  • EP1726359A1 and EP1974809B1 disclosed.
  • EP1974809B1 discloses double-layer three-way catalysts which contain cerium / zirconium mixed oxides in the layers, the cerium / zirconium mixed oxide in the upper layer each having a higher proportion of zirconium than that in the lower layer.
  • EP1900416B1 describes double-layer three-way catalysts which contain mixed oxides of cerium, zirconium and neodymium in the layers and in addition cerium-zirconium-yttrium lanthanum oxide-Al to inium oxide particles in the lower layer.
  • EP1726359A1 describes double-layer three-way catalysts which contain in the layers cerium / zirconium / lanthanum / neodymium mixed oxides with a zirconium content of more than 80 mol%, the cerium / zirconium / lanthanum / neodymium mixed oxide in the upper Layer can each have a higher proportion of zirconium than that in the lower layer.
  • WO2008 / 000449A2 also discloses double-layer catalysts which contain cerium / zirconium mixed oxides in both layers and the mixed oxide in the upper layer again has a higher proportion of zirconium. Some of the cerium / zirconium mixed oxides can also be replaced by cerium / zirconium / lanthanum / neodymium or cerium / zirconium / lanthanum / yttrium mixed oxides.
  • WO2009 / 012348A1 even describes three-layer catalysts, with only the middle and upper layers containing oxygen storage materials.
  • EP3045226A1 discloses double-layer three-way catalysts with improved aging stability, one being directly on the catalyst carrier
  • Layer A contains at least one platinum group metal and a cerium / zirconium / rare earth mixed oxide and a layer B applied to layer A and in direct contact with the exhaust gas flow contains at least one platinum group metal and a cerium / zirconium / rare earth mixed oxide , where RE stands for a rare earth metal other than cerium, characterized in that the proportion of rare earth oxide in the cerium / zirconium / rare earth mixed oxide of layer A is smaller than the proportion of rare earth oxide in the cerium / zirconium / rare earth mixed oxide of layer B.
  • the aging stability of the catalytic converters is therefore becoming even more important.
  • the light-off temperatures of the catalytic converter for converting the pollutants and its dynamic turnover capacity are important criteria for activity after aging.
  • the starting temperature for a pollutant indicates the temperature at which this pollutant is converted to more than 50%, for example. The lower these temperatures are, the earlier the pollutants can be converted after a cold start.
  • exhaust temperatures of up to 1050 ° C can occur directly at the engine outlet. The better the temperature stability of the catalytic converter, the closer it can be arranged to the engine. This also improves the exhaust gas cleaning after a cold start.
  • the present invention thus provides a catalyst which comprises two layers on an inert catalyst support, one layer A containing at least palladium as platinum group metal and a cerium / zirconium / lanthanum / yttrium mixed oxide, and one layer B applied to layer A at least Contains rhodium as platinum group metal and a cerium / zirconium / lanthanum / yttrium mixed oxide.
  • the lanthanum oxide content is between 1% by weight and 5% by weight, based on the cerium / zirconium / lanthanum / yttrium mixed oxide, and the yttrium oxide content is between 8% by weight and 20% by weight .-%, based on the cerium / zirconium / lanthanum / yttrium mixed oxide.
  • a preferred embodiment is characterized in that the yttrium oxide content in both layers A and B is between 10% by weight and 15% by weight, based on the cerium / zirconium / lanthanum / yttrium mixed oxide.
  • An yttrium oxide content between 12% by weight and 13% by weight is particularly preferred. As shown in the examples, this enables a lower light-off temperature to be achieved despite intensive aging, which ultimately leads to fewer emissions in dynamic ferry operations.
  • layer A contains at least palladium as platinum group metal and layer B contains at least rhodium as platinum group metal.
  • layer A and / or layer B additionally contains platinum as a further platinum group metal independently of one another.
  • Layer A preferably contains palladium and platinum and layer B contains rhodium and platinum or rhodium and palladium and platinum.
  • the catalyst according to the invention is free from platinum.
  • Layer A particularly preferably contains only palladium and layer B only contains rhodium or layer B contains only palladium and rhodium.
  • the cerium / zirconium / lanthanum / yttrium mixed oxides can serve as carrier materials for the platinum group metals in layer A and / or in layer B.
  • the platinum group metals in layer A and / or in layer B can also be completely or partially supported on active aluminum oxide.
  • layer A and layer B therefore contain active aluminum oxide. It is particularly preferred if the active aluminum oxide is stabilized by doping, in particular with lanthanum oxide. Preferred active aluminum oxides contain 0.5 to 6% by weight, in particular 3 to 5% by weight, of lanthanum oxide (La203).
  • active aluminum oxide is known to the person skilled in the art. It denotes in particular g-aluminum oxide with a specific surface area of 100 m 2 / g to 200 m 2 / g. Active aluminum oxide is widely described in the literature and is available on the market.
  • cerium / zirconium / lanthanum / yttrium mixed oxide in the context of the present invention excludes physical mixtures of cerium oxide, zirconium oxide, lathane oxide and yttrium oxide. Rather, “cerium / zirconium / lanthanum / yttrium mixed oxides” are largely homogeneous , three-dimensional crystal structure, which is ideally free of phases of pure cerium oxide, zirconium oxide or lathane oxide and yttrium oxide. Depending on the manufacturing process, however, products that are not completely homogeneous can also arise, which can generally be used without any disadvantage.
  • the ratio of cerium oxide to zirconium oxide in the cerium / zirconium / lanthanum / yttrium mixed oxides can vary within wide limits.
  • layer A it is, for example, 0.1 to 1.0, preferably from 0.2 to 0.7, particularly preferably from 0.3 to 0.5.
  • layer B it is, for example, 0.1 to 1.0, preferably from 0.2 to 0.7, particularly preferably from 0.3 to 0.5.
  • cerium / zirconium / lanthanum / yttrium mixed oxides of the present invention contain in particular no aluminum oxide in their crystal structure.
  • one or both layers contain alkaline earth compounds such as barium oxide or barium sulfate.
  • Preferred embodiments contain barium sulfate in layer A.
  • the amount of barium sulfate is in particular 5 g / l to 20 g / l volume of the inert catalyst support.
  • one or both layers additionally contain additives such as rare earth compounds such as lanthanum oxide and / or binders such as aluminum compounds.
  • additives such as rare earth compounds such as lanthanum oxide and / or binders such as aluminum compounds. These additives are used in amounts which can vary within wide limits and which the person skilled in the art can determine with simple means in the specific case.
  • layer A lies directly on the inert catalyst support, ie between the inert one
  • layer B is in direct contact with the exhaust gas flow, ie on layer B there is no further layer or no “overcoat”.
  • the catalyst according to the invention consists of layers A and B on an inert catalyst support. This means that layer A lies directly on the inert catalyst carrier, layer B is in direct contact with the exhaust gas flow and that there are no further layers.
  • Honeycomb bodies made of ceramic or metal with a volume V which have parallel flow channels for the exhaust gases from the internal combustion engine, are suitable as catalytically inert catalyst carriers. It can be both so-called flow-through honeycombs and wall-flow filters. Particularly in the case of a wall flow filter, the catalytic coating according to the invention can be located completely on, partially in or completely in the wall of the wall flow filter.
  • the wall surfaces of the flow channels are coated with those of the catalyst layers A and B.
  • the solids provided for this layer are suspended in water and, if necessary, coated with the resulting coating suspension of the catalyst carrier on and / or in the wall. The process is repeated with a coating suspension which contains the solids intended for layer B suspended in water.
  • Both layer A and layer B are preferably coated over the entire length of the inert catalyst support. This means that layer B completely covers layer A and consequently only layer B comes into direct contact with the exhaust gas flow.
  • a zoned coating variant is possible, however, in which layer A is at least partially covered by layer B. Examples:
  • Example 1 and Comparative Example 1 two-layer catalysts were produced by coating flow-through honeycomb carriers made of ceramic with 93 cells per cm 2 and a wall thickness of 0.11 mm, and the dimensions 10.6 cm in diameter and 11.4 cm in length, twice. For this purpose, two different suspensions for each of layers A and B were produced. The support was then first coated with the suspension for layer A and then calcined in air at 550 ° C. for 4 hours. The carrier coated with layer A was then coated with the suspension for layer B and then calcined under the same conditions as for layer A.
  • a two-layer catalyst was made by first making two suspensions.
  • the composition of the first suspension for layer A was (based on the volume of the catalyst support) 66 g / L activated aluminum oxide stabilized with 4% by weight of La2O3, 66 g / L cerium / zirconium / lanthanum / yttrium mixed oxide with 24% by weight .-% CeÜ2, 60 wt .-% ZrÜ2,
  • the composition of the second suspension for layer B was (based on the volume of the catalyst support) 60 g / L with 4 wt. -% CeÜ2, 60 wt .-% ZrÜ2, 3.5 wt .-% La2Ü3 and
  • a two-layer catalyst was produced analogously to Example 1.
  • the composition of the first suspension for layer A was 66 g / L, activated aluminum oxide stabilized with 4% by weight of La2O3, 66 g / L Cerium / zirconium / lanthanum / yttrium mixed oxide with 25% by weight Ce0 2 , 67.5% by weight Zr0 2 , 3.5% by weight La 2 0 3 and 4% by weight Y 2 0 3 , 16 g / L BaSC, 1.143 g / L Pd.
  • the composition of the second suspension for layer B was 60 g / L activated aluminum oxide stabilized with 4% by weight La 2 0 3 , 47 g / L cerium / zirconium / lanthanum / yttrium mixed oxide with 24% by weight Ce0 2 , 60% by weight Zr0 2 , 3.5% by weight La 2 0 3 and 12.5% by weight Y 2 0 3 , 0.177 g / L Rh.
  • Example 1 and Comparative Example 1 were aged in an engine test bench aging facility.
  • the hot exhaust gas was applied to two identical catalytic converters one behind the other.
  • the aging consisted of overrun switching aging with an exhaust gas temperature of 950 ° C before the catalytic converter inlet. This led to a maximum bed temperature of 1100 ° C in the first catalyst (CC1) and a maximum bed temperature of 1040 ° C in the second catalyst (CC2).
  • the aging time was 100 hours.
  • Table 1 contains the temperatures Tso at which 50% of the components considered are implemented.
  • the dynamic conversion behavior was determined in a range for l from 0.99 to 1.01 at a constant temperature of 510 ° C.
  • the amplitude of l was ⁇ 3.4%.
  • Table 2 contains the conversion at the intersection of the CO and NOx conversion curves, as well as the associated HC conversion.
  • Example 1 according to the invention shows a significant improvement in the start-up behavior and in the dynamic CO / NOx conversion after aging.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Toxicology (AREA)
  • General Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Catalysts (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

La présente invention concerne un catalyseur comprenant deux couches sur un support catalytique inerte, une couche A contenant au moins du palladium en tant que métal du groupe du platine, en plus d'un oxyde mixte de cérium/zirconium/lanthane/yttrium, et une couche B, qui est appliquée sur la couche A, contenant au moins du rhodium en tant que métal du groupe du platine, en plus d'un oxyde mixte de cérium/zirconium/lanthane/yttrium.
EP21703381.0A 2020-01-27 2021-01-26 Catalyseur à trois voies double couche présentant une meilleure stabilité au vieillissement Pending EP4096811A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020101876.2A DE102020101876A1 (de) 2020-01-27 2020-01-27 Doppelschichtiger Dreiweg-Katalysator mit weiter verbesserter Alterungsstabilität
PCT/EP2021/051728 WO2021151876A1 (fr) 2020-01-27 2021-01-26 Catalyseur à trois voies double couche présentant une meilleure stabilité au vieillissement

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WO2021151876A1 (fr) 2021-08-05
DE102020101876A1 (de) 2021-07-29
US20230045409A1 (en) 2023-02-09
US12296298B2 (en) 2025-05-13
KR20220128670A (ko) 2022-09-21
JP2023511668A (ja) 2023-03-22
JP7751586B2 (ja) 2025-10-08
CN114828988A (zh) 2022-07-29

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