Umicore Ag & Co Kg

Christoph Hengst

Frank-Walter Schuetze

Michael Schiffer

Michael Lennartz

Christoph Reith

Marcus Pfeifer

Gerald Jeske

Marco Lopez

Franz Dornhaus

Stéphanie Frantz

Davion Onuga Clark

Naohiro Kato

Birgit Friedrich

Martin Symalla

Markus Pfeifer

The invention relates to the use of a catalyst as a passive nitrogen oxide adsorber, which has a carrier substrate, a zeolite, palladium, and platinum, wherein the palladium is provided in a quantity of 0.01 to 10 wt. %, based on the sum of the weights of zeolite, platinum, and palladium and calculated as a palladium metal, and platinum in a quantity of 0.1 to 10 wt. %, based on the weight of the palladium and calculated as a platinum metal. The invention also relates to the use of said catalyst in connection with a SCR catalyst in an exhaust gas system.

Use of a palladium/platinum/zeolite-based catalyst as passive nitrogen oxide adsorber for purifying exhaust gas

The invention relates to a catalyst which comprises a carrier substrate, palladium, and a zeolite, the largest channels of which are formed by 10 tetradrically coordinated atoms; to the use of said catalyst as a passive nitrogen oxide adsorber, an exhaust gas system which contains said catalyst and an SCR catalyst, and to a method for purifying the exhaust gas of motor vehicles using said exhaust gas system.

Palladium/zeolite-based passive nitrogen oxide adsorber catalyst for purifying exhaust gas

The present invention relates to a diesel oxidizing catalytic converter which comprises a supporting body with a length L which extends between a first end surface a and a second end surface b, and catalytically active material zones A and B of different composition which are arranged on the supporting body, wherein &#x2014;material zone A comprises palladium or platinum and palladium in a weight ratio Pt:Pd of &#x3c;1 and, starting from the end surface a, extends to from 20% to 80% of the length L, and &#x2014;material zone B comprises platinum and palladium in a weight ratio Pt:Pd of &#x3c;10 and extends to from 80% to 100% of the length L, and wherein material zone B is arranged above material zone A and the weight ratio Pt:Pd in relation to the material zones A and B is from 1.5 to 3.0.

Diesel oxidizing catalytic converter

The present invention relates to a method for preventing an SCR catalyst from being contaminated with platinum group metal in an emission control system comprising, upstream of the SCR catalyst, a catalyst that contains platinum group metal, characterized in that a material zone containing a mixture of aluminum oxide and cerium oxide is located upstream of the SCR catalyst.

Method for preventing a selective catalytic reduction (SCR) catalyst from being contaminated with platinum

The present invention relates to a diesel oxidation catalyst, which comprises a carrier body having a length L extending between a first end face a and a second end face b and a catalytically active material zone A arranged on the carrier body, wherein the material zone A contains palladium and platinum on a manganese-containing carrier oxide, wherein the carrier oxide consists of a carrier oxide component A and a carrier oxide component B and the carrier oxide component B consists of manganese and/or a manganese compound and is present in an amount of 5 to 15 wt. %, calculated as MnOand based on the total weight of the manganese-containing carrier oxide.

Diesel oxidation catalyst containing manganese

The invention relates to a diesel oxidation catalyst which has a support body with a length L extending between a first end face a and a second end face b and catalytically active material zones A, B, and C arranged on the support body, wherein&#x2014;material zone A contains palladium or platinum and palladium in a weight ratio of Pt:Pd of &#x2264;1 and an alkaline earth metal and extends over 20 to 80% of the length L starting from the end face a, material zone B contains ceroxide, is free of platinum, and extends over 20 to 80% of the length L starting from the end face b, material zone C contains platinum or platinum and palladium in a weight ratio of Pt:Pd of &#x2265;5, and neither material zone A nor material zone C is arranged over material zone B.

Three-zone diesel oxidation catlayst

The present invention relates to a catalyst comprising a carrier substrate of the length L, a passive nitrogen oxide adsorber and means to control the temperature of the carrier substrate, as well as a process for cleaning of an exhaust gas emitted from a lean burn engine.

Passive nitrogen oxide adsorber catalyst

The present invention relates to a catalyst that comprises a carrier body with a length L, which extends between a first end face 'a' and a second end face 'b', and differently composed, catalytically-active material zones A, B, and C arranged on the carrier body, wherein

Catalyst for purifying the exhaust gases of diesel engines

The invention relates to a method for preventing the contamination by platinum of an SCR catalyst in an exhaust-gas treatment system, said system comprising an oxidation catalyst containing platinum on the inflow side of the SCR catalyst. The outflow side of the oxidation catalyst comprises a material zone which removes traces of platinum contained in the exhaust-gas stream.

Method for preventing the contamination by platinum of an SCR catalyst

The invention relates to a catalyst for purifying the exhaust gases from diesel engines, in particular an oxidation catalyst which is particularly well suited for the purification of exhaust gases from heavy goods vehicles when further exhaust gas purification units such as a particle filter and/or a nitrogen oxide reduction catalyst are installed downstream thereof. The catalyst contains two catalytically active coatings which have different compositions and of which only one is in direct contact with the outflowing exhaust gas. The coating () which is in direct contact with the outflowing exhaust gas is platinum-rich and contains a total amount of noble metal (platinum and palladium) which is greater than that in the coating () which is not in direct contact with the outflowing exhaust gas. The platinum-rich coating () displays an extremely high oxidizing power, in particular in the NO oxidation, while the coating () which is not in direct contact with the outflowing exhaust gas ensures a good 'heat-up performance' of the catalyst.

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Butzbach, Germany

Christoph Hengst