EP3411143A1 - Catalyseur à stockage des oxydes d'azote multicouche contenant du manganèse - Google Patents

Catalyseur à stockage des oxydes d'azote multicouche contenant du manganèse

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Publication number
EP3411143A1
EP3411143A1 EP17705036.6A EP17705036A EP3411143A1 EP 3411143 A1 EP3411143 A1 EP 3411143A1 EP 17705036 A EP17705036 A EP 17705036A EP 3411143 A1 EP3411143 A1 EP 3411143A1
Authority
EP
European Patent Office
Prior art keywords
oxide
storage catalyst
washcoat
catalyst according
nitrogen
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Withdrawn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
EP17705036.6A
Other languages
German (de)
English (en)
Inventor
Thomas UTSCHIG
Elena Mueller
Ruediger Hoyer
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 EP3411143A1 publication Critical patent/EP3411143A1/fr
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/56—Platinum group metals
    • B01J23/63—Platinum group metals with rare earths or actinides
    • 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
    • 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
    • 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
    • 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
    • B01J23/58—Platinum group metals with alkali- or alkaline earth metals
    • 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
    • B01J23/64—Platinum group metals with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J23/656—Manganese, technetium or rhenium
    • B01J23/6562—Manganese
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/19—Catalysts containing parts with different compositions
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/02—Impregnation, coating or precipitation
    • B01J37/024—Multiple impregnation or coating
    • B01J37/0244—Coatings comprising several layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/02—Impregnation, coating or precipitation
    • B01J37/03—Precipitation; Co-precipitation
    • B01J37/038—Precipitation; Co-precipitation to form slurries or suspensions, e.g. a washcoat
    • 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
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—Nitrogen oxides
    • 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
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    • 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
    • B01D2255/202—Alkali metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D2255/20—Metals or compounds thereof
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    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
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    • B01D2255/2042—Barium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/204—Alkaline earth metals
    • B01D2255/2047—Magnesium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
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    • B01D2255/2063—Lanthanum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
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    • 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
    • B01D2255/2073—Manganese
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D2255/00—Catalysts
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    • B01D2255/209—Other metals
    • B01D2255/2092—Aluminium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D2255/00—Catalysts
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    • B01D2255/9022—Two layers
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    • 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
    • B01D2258/00—Sources of waste gases
    • B01D2258/01—Engine exhaust gases
    • B01D2258/012—Diesel engines and lean burn gasoline engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
    • B01J35/396—Distribution of the active metal ingredient
    • 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
    • B01J37/0201—Impregnation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/02—Impregnation, coating or precipitation
    • B01J37/0215—Coating
    • 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
    • B01J37/16—Reducing
    • B01J37/18—Reducing with gases containing free hydrogen
    • 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
    • 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
    • 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
    • F01N2510/0684—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings having more than one coating layer, e.g. multi-layered coatings

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.
  • nitrogen oxide storage catalysts for which the term “lean NOx trap” or "LNT” is common known.
  • Their cleaning effect is based on the fact that in a lean phase of operation of the engine, the nitrogen oxides are stored by the storage material of the storage catalyst mainly in the form of nitrates and decomposed in a subsequent rich phase of operation of the engine again and released so the nitrogen oxides with the reducing
  • 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 capable of forming nitrates with the acidic nitrogen oxides of the exhaust gas and of storing them in this way. They are suitable for generating a large interaction area with the exhaust gas in the highest possible dispersion
  • 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 directly 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 and at least one finely divided oxygen storing material. Only part of the finely divided solids of the second layer serve as a carrier for the platinum group metals.
  • the catalyst is a three-way catalytic converter that controls the harmful components of the exhaust gas
  • 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 M2O and alkaline earth metal oxide MO.
  • manganese compounds in particular manganese oxide
  • DE102011109200A1 and US2015 / 165422 describe manganese-containing diesel oxidation catalysts.
  • DE102012204524A1 describes LNT catalysts which contain manganese-containing mixed oxides, for example MnOx-CeO 2 .
  • US2013 / 336865 also describes NOx absorber catalysts which may contain manganese.
  • the present invention relates to a nitrogen oxide storage catalyst comprising at least two catalytically active washcoat layers on one
  • cerium oxide as well as platinum and palladium and is free of alkali and alkaline earth compounds.
  • the cerium oxide used in 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 from 110 to 160 g / l, for example from 125 to 145 g / l.
  • cerium oxide is used in amounts of 22 to 120 g / l, for example 40 to 100 g / l or 45 to 65 g / l.
  • Suitable alkaline earth compounds in the washcoat A are, in particular, oxides, carbonates and / or hydroxides of magnesium, strontium and / or barium, in particular magnesium oxide, barium oxide and strontium oxide.
  • Suitable alkali compounds in the washcoat A are, in particular, oxides, carbonates and / or hydroxides of lithium, potassium and / or sodium.
  • the alkaline earth or alkali compound in washcoat A is present in amounts of 10 to 50 g / l, especially 15 to 20 g / l, calculated as alkaline earth oxide and based on the volume of the support body.
  • manganese oxide in washcoat A is present in amounts of from 1 to 10 weight percent, preferably 2.5 to 7.5 Wt .-%, based on the sum of Washcoattiken A and B, each calculated as MnO before.
  • the washcoat layer B also contains
  • Washcoat layer B at up to 2.5 wt .-%, preferably 0.5 to 2.5 wt .-%, based on the sum of Washcoat füren A and B.
  • manganese oxide is not used as a carrier material, neither for the noble metals platinum, palladium and optionally rhodium, nor for another component of washcoat A and optionally washcoat B.
  • manganese oxide in the context of the present invention means in particular MnO, MnCh or Mn 2 O 3 or combinations of MnO 2 , MnO
  • manganese oxide is not in the form of mixed oxides with other oxides of washcoat A and B layers.
  • manganese oxide is not present in the form of a mixed oxide with cerium oxide, for example not in the form of MnOx-CeO 2 , MnO-ZrO 2 and
  • the ratio platinum to palladium in the washcoat A in embodiments of the present invention is for example 4: 1 to 18: 1 or 6: 1 to 16: 1, for example 8: 1, 10: 1, 12: 1 or 14: 1.
  • the ratio platinum to palladium in the washcoat layer B is also in embodiments of the present invention, for example 4: 1 to 18: 1 or 6: 1 to 16: 1, for example 8: 1, 10: 1, 12: 1 or 14: 1 but independent of the ratio in washcoat A
  • washcoat B contains rhodium as another precious metal. Rhodium is in this case
  • the total amount of noble metal i. of platinum, palladium and
  • optionally rhodium, in the nitrogen oxide storage catalyst according to the invention is in embodiments of the present invention, 2.12 to 7.1 g / l (60 to 200 g / ft 3 ), based on the volume of the support body.
  • the noble metals are platinum and palladium and optionally rhodium
  • alumina silica
  • titanium dioxide but also mixed oxides such as aluminum-silicon mixed oxides and cerium-zirconium mixed oxides.
  • platinum and palladium and, optionally, rhodium are used as support material for the noble metals
  • Alumina is used, in particular those which is stabilized by 1 to 6 wt .-%, in particular 4 wt .-%, lanthanum oxide.
  • Manganese oxide preferably does not serve as a support for platinum and palladium and optionally rhodium.
  • the total washcoat load of the support body is in
  • Embodiments of the present invention 300 to 600 g / l, based on the volume of the support body.
  • 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 100 to 160 g / l
  • o contains manganese oxide in an amount of 10 to 20 g / l and
  • washcoat caring A in amounts of 250 to 350 g / l and the Washcoat caring B in amounts of 80 to 130 g / l is present and wherein the amount g / l each refers to the volume of the support body.
  • thermal aftertreatment (calcination and optionally reduction with forming gas or hydrogen). These methods are well known in the art.
  • the necessary coating suspensions can after the
  • the nitrogen oxide storage catalysts according to the invention are outstandingly suitable for converting NOx into exhaust gases of
  • 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
  • Figure 1 NOx conversion of the catalysts Kl (dashed line) and VK1 (solid line) as a function of temperature.
  • Figure 2 NOx conversion of the catalysts K2 (solid line) and K3 (dashed) as a function of temperature.
  • Figure 3 NOx conversion of the catalysts K2 (solid line) and K4 (dashed) as a function of temperature.
  • the loading of Pt and Pd is 35 g / ft 3 (1.236 g / l) and 3.5 g / ft 3 (0.124 g / l) and the total loading of the washcoat layer about 293 g / l based on the volume of the ceramic - Carrier.
  • a further washcoat layer B is applied to the first washcoat layer, also containing Pt and Pd supported on alumina, and Rh supported on a lanthanum stabilized alumina.
  • the loading of Pt, Pd and Rh in this washcoat layer is 35 g / ft 3 (1.236 g / l), 3.5 g / ft 3 (0.124 g / l) and 5 g / ft 3 (0.177 g / l).
  • the washcoat layer B also contains 55 g / l of cerium oxide with a layer B washcoat loading of about 81 g / l.
  • the catalyst thus obtained is hereinafter called Kl.
  • Example 1 was repeated with the difference that washcoat A did not contain manganese oxide.
  • the catalyst thus obtained is hereinafter called VK1.
  • Atmosphere aged b) The NOx conversion of Kl or VK1 as a function of the temperature before the catalyst was determined in a model gas reactor in the so-called NOx conversion test.
  • Hydrocarbon mixture (consisting of 33 ppm propene and 17 ppm propane) and a residual oxygen content of 7 vol .-% at one
  • FIG. 1 shows the NO x conversions of the inventive catalyst K 1 and of the comparative catalyst VK 1 thus determined.
  • the turnover of Kl in the entire temperature range is higher than the sales of VK1.
  • a honeycomb ceramic support is coated with a first washcoat A, the Pt and Pd supported on alumina, ceria in an amount of 125 g / l, 21 g / l barium oxide, 7.5 g / l magnesium oxide and 7.5 g / l manganese oxide in the form of manganese carbonate.
  • the loading of Pt and Pd is 35 g / ft 3 (1.236 g / l) and 3.5 g / ft 3 (0.124 g / l) and the
  • Total loading of the washcoat layer about 299 g / l based on the volume of the ceramic carrier.
  • another washcoat layer B is applied, which also contains Pt and Pd, and Rh supported on alumina.
  • the loading of Pt, Pd and Rh in this washcoat layer is 35 g / ft 3 (1.236 g / l), 3.5 g / ft 3 (0.124 g / l) and 5 g / ft 3 (0.177 g / l).
  • Washcoat layer B also contains 55 g / l of cerium oxide at one
  • the catalyst thus obtained is hereinafter called K2.
  • Example 2 was repeated with the difference that washcoat B additionally contained 2.5 g / l of manganese oxide in the form of manganese carbonate.
  • the catalyst thus obtained is hereinafter called K3.
  • Example 2 was repeated with the difference that washcoat A contained 15 g / l of manganese oxide in the form of manganese carbonate.
  • the catalyst thus obtained is hereinafter called K4.
  • Example 1 was repeated with the difference that the amounts of cerium oxide and manganese oxide indicated in Table 1 below were used.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Combustion & Propulsion (AREA)
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  • Environmental & Geological Engineering (AREA)
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Abstract

L'invention concerne un catalyseur à stockage des oxydes d'azote, composé d'au moins deux couches d'imprégnation catalytiquement actives sur un corps de support. Une couche d'imprégnation inférieure A contient de l'oxyde de cérium, un composé alcalino-terreux et/ou un composé alcalin, du platine et du palladium, ainsi que de l'oxyde de manganèse, et une couche d'imprégnation supérieure B disposée sur la couche d'imprégnation A contient de l'oxyde de cérium, ainsi que du platine et du palladium et ne contient pas de composé alcalin et alcalino-terreux. L'invention concerne également un procédé de conversion des NOx dans des gaz d'échappement de véhicules automobiles entraînés par des moteurs fonctionnant avec un mélange pauvre.
EP17705036.6A 2016-02-02 2017-02-01 Catalyseur à stockage des oxydes d'azote multicouche contenant du manganèse Withdrawn EP3411143A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016101761.2A DE102016101761A1 (de) 2016-02-02 2016-02-02 Katalysator zur Reduktion von Stickoxiden
PCT/EP2017/052081 WO2017134065A1 (fr) 2016-02-02 2017-02-01 Catalyseur à stockage des oxydes d'azote multicouche contenant du manganèse

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EP3411143A1 true EP3411143A1 (fr) 2018-12-12

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US (1) US20200032687A1 (fr)
EP (1) EP3411143A1 (fr)
KR (1) KR20180111903A (fr)
CN (1) CN108602051A (fr)
DE (1) DE102016101761A1 (fr)
WO (1) WO2017134065A1 (fr)

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EP3623047B1 (fr) 2018-09-17 2021-02-24 Umicore Ag & Co. Kg Catalyseur de réduction d'oxydes d'azote
EP3695902B1 (fr) 2019-02-18 2021-09-01 Umicore Ag & Co. Kg Catalyseur destiné à la réduction d'oxydes d'azote
KR102211944B1 (ko) * 2019-04-04 2021-02-03 희성촉매 주식회사 귀금속 박층을 최상층으로 포함하는 다층구조의 배기가스 정화용 촉매 및 이의 제조방법
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JP2026508740A (ja) * 2022-12-02 2026-03-12 ビーエーエスエフ モバイル エミッションズ カタリスツ エルエルシー ホルムアルデヒド、窒素酸化物（ｎｏ）、及び炭化水素のうちの１つ以上を含有する排気ガス流の処理のための硫黄捕捉材料を含む触媒
EP4605129A1 (fr) 2022-12-02 2025-08-27 BASF Corporation Catalyseur contenant un composant de stockage d'oxygène pour le traitement d'un flux de gaz d'échappement contenant au moins un parmi le formaldéhyde, l'oxyde d'azote (no) et les hydrocarbures

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KR20180111903A (ko) 2018-10-11
US20200032687A1 (en) 2020-01-30
DE102016101761A1 (de) 2017-08-03
CN108602051A (zh) 2018-09-28

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