EP2958660A1 - Catalyseur et procédé de réduction d'oxydes d'azote - Google Patents

Catalyseur et procédé de réduction d'oxydes d'azote

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Publication number
EP2958660A1
EP2958660A1 EP14706538.7A EP14706538A EP2958660A1 EP 2958660 A1 EP2958660 A1 EP 2958660A1 EP 14706538 A EP14706538 A EP 14706538A EP 2958660 A1 EP2958660 A1 EP 2958660A1
Authority
EP
European Patent Office
Prior art keywords
washcoat
washcoat layer
platinum
storage catalyst
amount
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.)
Withdrawn
Application number
EP14706538.7A
Other languages
German (de)
English (en)
Inventor
Ruediger Hoyer
Anke Schuler
Thomas UTSCHIG
Elena Mueller
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 EP14706538.7A priority Critical patent/EP2958660A1/fr
Publication of EP2958660A1 publication Critical patent/EP2958660A1/fr
Withdrawn legal-status Critical Current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
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • B01D53/9413—Processes characterised by a specific catalyst
    • B01D53/9422—Processes characterised by a specific catalyst for removing nitrogen oxides by NOx storage or reduction by cyclic switching between lean and rich exhaust gases (LNT, NSC, NSR)
    • 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
    • B01D53/9481—Catalyst preceded by an adsorption device without catalytic function for temporary storage of contaminants, e.g. during cold start
    • 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
    • B01D53/9468—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 layers
    • 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
    • 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
    • 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
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/40—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
    • B01D2255/903—Multi-zoned catalysts
    • B01D2255/9032—Two zones
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/90—Physical characteristics of catalysts
    • B01D2255/91—NOx-storage component incorporated in the catalyst
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/90—Physical characteristics of catalysts
    • B01D2255/911—NH3-storage component incorporated in the 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
    • B01J2523/00—Constitutive chemical elements of heterogeneous catalysts

Definitions

  • the present invention relates to a catalyst for the reduction of nitrogen oxides, which is contained in the exhaust lean burned internal combustion engines.
  • the exhaust of motor vehicles which are operated with lean-burn internal combustion engines, for example with diesel engines, in addition to carbon monoxide (CO) and nitrogen oxides (NO x ) also contains components resulting from the incomplete combustion of the fuel in the combustion chamber of the cylinder.
  • HC residual hydrocarbons
  • Diesel soot or “soot particles”.
  • Diesel soot particles particulate emissions
  • These are complex agglomerates of predominantly carbon-containing solid particles and an adhering liquid phase, which mostly consists of relatively long-chain hydrocarbon condensates.
  • the liquid phase adhering to the solid components is also referred to as "Soluble Organic Fraction SOF” or “Volatile Organic Fraction VOF".
  • nitrogen oxide storage catalysts for which the term “lean NOx trap” or LNT is customary, are known, whose cleaning effect is based on the fact that in a lean phase of operation of the engine, the nitrogen oxides from the storage material of the
  • Storage catalytic converter are stored mainly in the form of nitrates and this decomposes again in a subsequent rich phase of operation of the engine and the thus released nitrogen oxides with the reducing
  • Exhaust gas components are converted to the storage catalyst to nitrogen, carbon dioxide and water. This procedure is described for example in SAE SAE 950809.
  • Suitable storage materials are, in particular, oxides, carbonates or hydroxides of magnesium, calcium, strontium, barium, the alkali metals, the rare earth metals or mixtures thereof. Due to their basic properties, these compounds are able to form nitrates with the acidic nitrogen oxides of the exhaust gas and produce them in this way
  • nitrogen oxide storage catalysts generally contain noble metals such as platinum, palladium and / or rhodium as catalytically active components. Their task is, on the one hand, to oxidise NO to NO 2, CO and HC to CO 2 under lean conditions and, on the other hand, to reduce released NO 2 to nitrogen during the rich operating phases in which the nitrogen oxide storage catalyst is regenerated.
  • EP 0 885 650 A2 describes an exhaust gas purification catalyst for internal combustion engines with two catalytically active layers on a support body.
  • the layer located on the support body comprises one or more highly dispersed alkaline earth oxides, at least one platinum group metal, as well as at least one finely divided, oxygen-storing material.
  • the platinum group metals are in close contact with all components of the first layer.
  • the second layer is in direct contact with the exhaust gas and contains at least one platinum group metal, as well as at least a finely divided, oxygen-storing material. Only a part of
  • finely divided solids of the second layer serves as a carrier for the
  • the catalyst is a three-way catalyst that removes the harmful exhaust gas components substantially at stoichiometric conditions, ie. at the air ratio ⁇ of 1.
  • a nitrogen oxide storage catalyst which comprises two superimposed catalyst layers on a carrier substrate.
  • the lower layer lying directly on the carrier substrate comprises one or more noble metals, as well as one or more nitrogen oxide storage components.
  • the upper layer comprises one or more
  • Precious metals, as well as cerium oxide and is free of alkali or alkaline earth components Catalyst substrates containing nitrogen oxide storage materials and having two or more layers are also described in WO 2012/029050.
  • the first layer is directly on the carrier substrate and comprises platinum and / or palladium, while the second layer is on the first and comprises platinum.
  • Both layers also contain one or more oxygen storage materials and one or more nitric oxide storage materials comprising one or more alkali and / or alkaline earth metals.
  • the total amount of alkali and alkaline earth metal in the nitrogen oxide storage materials is 0.18 to 2.5 g / in 3 calculated as alkali metal oxide M 2 O and alkaline earth metal oxide MO.
  • the present invention relates to a nitrogen oxide storage catalyst comprising at least two catalytically active washcoat layers on one
  • washcoat layer B which is disposed above the washcoat layer A, contains cerium oxide, as well as platinum and / or palladium and no alkaline earth metal compound
  • washcoat layer B is present in an amount of 50 to 200 g / l, based on the volume of the support body, and the minimum mass fraction in% of cerium oxide in the washcoat layer B is of the formula
  • washcoat layers A and B can be any cerium oxide used in washcoat layers A and B.
  • cerium oxide is used in the washcoat layer A in an amount of 30 to 120 g / l, in particular 30 to 80 g / l.
  • washcoat B the minimum mass fraction in% of cerium oxide calculated according to the above formula.
  • amount of washcoat B in g / l in this formula means the dimensionless number which corresponds to the amount of washcoat layer B stated in g / l.
  • Mass fraction of cerium oxide in the washcoat B at least 50%, which, depending on the total load of Washcoat caring B amounts of at least 25 to 100 g / l, based on the volume of the support body corresponds.
  • the washcoat layer B is present in an amount of 75 to 150 g / l, based on the volume of the support body. Accordingly, in this case, the cerium oxide amounts at least 28.1 to 67.5 g / l, each based on the volume of the support body.
  • the washcoat layer B is present in an amount of 80 to 130 g / l, based on the volume of the support body. Accordingly, in this case, the cerium oxide amounts to at least 30.4 to 55.9 g / l, each based on the volume of the support body.
  • washcoat B The upper limit of the amount of ceria contained in washcoat B results from the maximum washcoat loading of 200 g / l less the
  • Washcoat B except cerium oxide, precious metal and support materials for the
  • the maximum amount of cerium oxide, which may be contained in washcoat B, can thus be calculated in a simple manner.
  • Washcoat layer B not only no alkaline earth compound, but also no alkali compound.
  • the washcoat A contains platinum or platinum and palladium. in the
  • the ratio of platinum to palladium is 1: 2 to 20: 1, in particular 1: 1 to 10: 1, for example 1: 1, 2: 1, 4: 1 and 10: 1.
  • the washcoat layer B contains platinum or palladium, in preferred embodiment
  • Embodiments of the present invention include platinum or platinum and palladium.
  • the ratio is platinum to Palladium 1: 2 to 20: 1, in particular 1: 1 to 10: 1, for example 1: 1, 2: 1,
  • Washcoat A and / or Washcoat B as another noble metal rhodium.
  • Rhodium is in this case, in particular in amounts of 0.1 to 10 g / ft 3 (equivalent to 0.003 to 0.35 g / l), based on the volume of the support body before.
  • the noble metals platinum and / or palladium and optionally rhodium are usually present on suitable support materials.
  • high surface area, high melting oxides are used, for example
  • Aluminum oxide silicon dioxide, titanium dioxide, but also mixed oxides such as cerium-zirconium mixed oxides.
  • alumina is used as support material for the noble metals, in particular those stabilized by 1 to 6 wt.%, In particular 4 wt.%, Lanthanum oxide. It is preferred if the noble metals platinum, palladium or rhodium are supported only on one or more of the abovementioned carrier materials and thus not with all components of the respective
  • Suitable alkaline earth compounds in the washcoat A are, in particular, oxides, carbonates or hydroxides of strontium and barium, in particular barium oxide and strontium oxide.
  • Suitable alkali compounds in the washcoat A are, in particular, oxides, carbonates or hydroxides of lithium, potassium and sodium.
  • the alkaline earth or, alkali compound is present in amounts of 10 to 50 g / l, especially 15 to 20 g / l, calculated as alkaline earth or alkali oxide.
  • the present invention relates to a nitrogen oxide storage catalyst comprising at least two catalytically active washcoat layers on a support body,
  • o cerium oxide in an amount of 30 to 80 g / l
  • o barium oxide contains and
  • an upper washcoat layer B is disposed over the lower washcoat layer A and
  • Washcoat caring B is present in amounts of 80 to 130 g / l and wherein the quantity g / l each on the volume of
  • the application of the catalytically active Waschcoattiken A and B on the support body is carried out by the usual dip coating process or pump and suction coating method with subsequent thermal treatment (calcination and optionally reduction with forming gas or hydrogen). These methods are well known in the art.
  • the nitrogen oxide storage catalysts according to the invention are outstandingly suitable for the conversion of NO x in exhaust gases from
  • the nitrogen oxide storage catalysts according to the invention are thus suitable for Euro 6 applications.
  • the present invention thus also relates to a method for
  • washcoat layer B is present in an amount of 50 to 200 g / l, based on the volume of the carrier body, and the minimum mass fraction of cerium oxide in% in the washcoat layer B is of the formula
  • Nitrogen storage catalyst correspond to the above
  • Figure 1 NOx conversion of the catalysts Kl, VK1A as a function of temperature.
  • FIG. 2 NOx conversion of the catalysts K2 and VK2A as a function of the temperature.
  • Figure 3 Stored NOx mass in the first 800s of a NEDC drive cycle based on the catalyst volume as a function of the Washcoatbeladung the upper Washcoat caring B and the ceria mass fraction in the
  • the loading of Pt and Pd is 50 g / cft (1.776 g / l) and 5 g / cft (0.177 g / l) and the total loading of the
  • washcoat 181 g / l based on the volume of the ceramic support.
  • another washcoat layer B is applied which also contains Pt and Pd as well as Rh supported on a lanthanum stabilized alumina.
  • the loading of Pt, Pd and Rh in this washcoat layer is 50 g / cft (1.776 g / l), 5 g / cft (0.177 g / l) and 5 g / cft (0.177 g / l).
  • the washcoat layer B also contains 93 g / L of cerium oxide with a layer B washcoat loading of 181 g / L.
  • the catalyst thus obtained is hereinafter called Kl.
  • Comparative examples la to lc differ from Example 1 in that the amounts of cerium oxide in washcoat A and B are varied at a constant total ceria amount of 140 g / l and constant washcoat loading of the washcoat A and B.
  • the cerium oxide distribution Comparative Examples la to le are shown in Table 1 below.
  • the catalysts thus obtained are hereinafter called VK1A, VK1B and VK1C, respectively.
  • Example 2 differs from the preceding examples in that the lower washcoat layer A has a washcoat loading of 300 g / l and a cerium oxide amount of 116 g / l. In contrast, the upper
  • Washcoat B has a washcoat loading of 62 g / l and a ceria loading of 24 g / l. This corresponds to a cerium oxide content in the
  • Comparative Examples 2a to 2c differ from Example 2 in that washcoat loadings of the washcoat layers A and B are varied, with the total washcoat loadings of both layers being constant at 362 g / l. Similarly, the ceria content in the washcoat layer B is constant at 39% and the total amount of cerium oxide is constant at 140 g / l based on the catalyst volume.
  • the washcoat loadings of the washcoat layer B and the amounts of cerium oxide in the washcoat layers A and B are shown in Table 1 below.
  • Example 3 differs from the previous examples in that lower washcoat A has a washcoat loading of 235 g / L and a cerium oxide amount of 65 g / L. In contrast, the upper
  • Washcoat B has a washcoat loading of 127 g / L and a ceria loading of 75 g / L. This corresponds to a cerium oxide content in the
  • the catalyst thus obtained is hereinafter called K2.
  • Example Catalyst 1 has two washcoat layers, the first layer having a washcoat loading of 1.7 g / in 3 (104 g / L) and the second layer having a washcoat loading of 2.6 g / in 3 (159 g / L) , The amount of ceria in the second washcoat layer is not clear.
  • the NOx conversion of the catalyst K2 according to the invention and the comparison catalyst VK2A is from the temperature before
  • Table 1 shows the summary of all catalysts.
  • the amount of NOx stored relative to catalyst volume is shown in the first 800 seconds of a NEDC drive cycle.
  • the exhaust gas of a typical Euro 6 diesel engine is simulated in a model gas reactor and passed over the catalyst sample.
  • the first 800s of the NEDC cycle show the NOx storage behavior at temperatures ⁇ 200 ° C. In order to meet the Euro 6 emissions standard, it is particularly important to show a high NOx storage capacity in this area.
  • the values for the stored NOx mass in Table 1 show that only in the
  • FIG. 3 shows the relationship between the amount of NOx stored in the first 800 seconds of a NEDC driving cycle
  • a further catalyst according to the invention is obtained if, starting from catalyst K2 of Example 2, a quantity of cerium oxide in the washcoat layer B of 40 g / l is selected. This corresponds to a cerium oxide content in the washcoat layer B of 64.5%.
  • Example 5
  • a further catalyst according to the invention is obtained if, starting from catalyst K1 of example 1, a quantity of cerium oxide in the washcoat B of 145 g / l is selected. This corresponds to a cerium oxide content in the washcoat layer B of 80%.
  • a honeycomb-shaped ceramic support is coated with a first washcoat A comprising Pt and Pd in combination with a magnesium-aluminum mixed oxide, cerium oxide in an amount of 160 g / l, and 18 g / l
  • Barium oxide contains.
  • the loading of Pt and Pd is 60 g / cft (2.119 g / l) and 6 g / cft (0.212 g / l) and the total loading of the
  • Washcoat layer 258 g / l based on the volume of the ceramic carrier.
  • another washcoat layer B containing Pt and Pd and Rh supported on a lanthanum stabilized alumina.
  • the loading of Pt, Pd and Rh in this washcoat layer is 20 g / cft (0.706 g / l), 10 g / cft (0.353 g / l) and 5 g / cft (0.177 g / l).
  • the washcoat layer B also contains 55 g / l of cerium oxide with a layer B washcoat loading of 100 g / l.

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  • Exhaust Gas After Treatment (AREA)

Abstract

La présente invention concerne un catalyseur accumulateur d'oxyde d'azote, constitué d'au moins deux couches de washcoat (revêtement imprégnateur) catalytiquement actif sur un substrat porteur. Une couche de washcoat inférieure (A) contient de l'oxyde de cérium, un composé de métal alcalino-terreux et/ou un composé de métal alcalin ainsi que du platine, et une couche de washcoat supérieure (B), disposé par-dessus la couche de washcoat A, contient de l'oxyde de cérium, du platine et/ou du palladium et aucun composé de métal alcalino-terreux. L'invention concerne en outre un procédé de conversion des NOx contenus dans les gaz d'échappement de véhicules à moteur propulsés par des moteurs utilisant un mélange pauvre.
EP14706538.7A 2013-02-21 2014-02-21 Catalyseur et procédé de réduction d'oxydes d'azote Withdrawn EP2958660A1 (fr)

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EP14706538.7A EP2958660A1 (fr) 2013-02-21 2014-02-21 Catalyseur et procédé de réduction d'oxydes d'azote

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EP13156095.5A EP2769760A1 (fr) 2013-02-21 2013-02-21 Catalyseur destiné à la réduction d'oxyde d'azote
PCT/EP2014/053383 WO2014128236A1 (fr) 2013-02-21 2014-02-21 Catalyseur et procédé de réduction d'oxydes d'azote
EP14706538.7A EP2958660A1 (fr) 2013-02-21 2014-02-21 Catalyseur et procédé de réduction d'oxydes d'azote

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EP2958660A1 true EP2958660A1 (fr) 2015-12-30

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EP13156095.5A Withdrawn EP2769760A1 (fr) 2013-02-21 2013-02-21 Catalyseur destiné à la réduction d'oxyde d'azote
EP14706538.7A Withdrawn EP2958660A1 (fr) 2013-02-21 2014-02-21 Catalyseur et procédé de réduction d'oxydes d'azote

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US (1) US20150352495A1 (fr)
EP (2) EP2769760A1 (fr)
JP (1) JP2016508872A (fr)
KR (1) KR20150120460A (fr)
CN (1) CN104968416A (fr)
WO (1) WO2014128236A1 (fr)

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US9662638B2 (en) 2013-01-08 2017-05-30 Umicore Ag & Co. Kg Catalyst for reducing nitrogen oxides
US10376839B2 (en) 2014-01-22 2019-08-13 Umicore Shokubai Japan Co., Ltd. Exhaust gas purification catalyst for lean burn engine
MX2017011249A (es) * 2015-03-03 2018-07-06 Basf Corp Trampa pobre en nox con rendimiento mejorado a alta y baja temperatura.
CN108778490A (zh) * 2016-02-22 2018-11-09 优美科股份公司及两合公司 用于还原氮氧化物的催化剂
CN105749911B (zh) * 2016-02-26 2019-02-12 凯龙蓝烽新材料科技有限公司 一种氨氧化催化剂的制备方法
DE102016207484A1 (de) * 2016-05-02 2017-11-02 Umicore Ag & Co. Kg Dieseloxidationskatalysator
GB2557673A (en) * 2016-12-15 2018-06-27 Johnson Matthey Plc NOx adsorber catalyst
GB2560943A (en) * 2017-03-29 2018-10-03 Johnson Matthey Plc NOx adsorber catalyst
KR101971638B1 (ko) * 2017-08-28 2019-04-23 희성촉매 주식회사 비-백금족 ＮＯｘ 트랩층을 가지는 ＮＯｘ 트랩 촉매
CN113164920A (zh) 2018-12-28 2021-07-23 罗地亚经营管理公司 氧化铈用于制备贫NOx捕集催化组合物的用途以及使用该组合物处理排气的方法
WO2024014409A1 (fr) * 2022-07-13 2024-01-18 三井金属鉱業株式会社 Composition de catalyseur pour purification de gaz d'échappement, catalyseur pour purification de gaz d'échappement, et système de purification de gaz d'échappement

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EP2769760A1 (fr) 2014-08-27
CN104968416A (zh) 2015-10-07
WO2014128236A1 (fr) 2014-08-28
US20150352495A1 (en) 2015-12-10
KR20150120460A (ko) 2015-10-27
JP2016508872A (ja) 2016-03-24

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