Heraeus Deutschland Gmbh & Co Kg

Heraeus Precious Metals Gmbh & Co. Kg

Heraues Deutschland Gmbh & Co. Kg

Ansgar Wille

Marcus Bonifer

Martina Kemmer

Christian Breuer

Uwe Endruschat

Prasanna Rajagopalan

The present invention relates to a catalytically effective composition for a multilayer catalyst for exhaust gas after-treatment of combustion facilities and to a multilayer catalyst containing the catalytically effective composition. Moreover, the invention relates to an exhaust gas after-treatment system and to a vehicle which both contain the catalyst according to the invention.

Method for preparing catalyst composition for exhaust gas after-treatment

The present invention relates to a method for producing a multilayer catalyst, to the multilayer catalyst produced by the method, and to the use of the catalyst for after-treatment of exhaust gases.

Catalyst with highly annealed Pd layer

Catalytically effective composition for a multilayer catalyst for exhaust gas after-treatment of combustion exhaust gases

A catalyst for selective oxidation of hydrocarbons relative to carbon monoxide includes a mixed oxide based on the compound CeTiCrO, wherein x is (the total of the valences of the metals)/2. Preferably, the mixed oxide is fixed as a coating on a molded body or less than 0.5 wt. % precious metal is doped to the mixed oxide. Oxidizable exhaust-gas components are oxidized for exhaust-gas purification by a mixed oxide based on the compound CeTiCrOas the catalyst. Preferably, hydrocarbons are preferentially oxidized relative to carbon monoxides or nitrogen oxides. For producing an oxidation catalyst for internal combustion engines, a mixed oxide made of cerium oxide, titanium oxide, chromium oxide, and optionally other metal oxides is fixed to a metallic or oxide or carbide, high temperature-stable molded body or an oxide ceramic, wherein the oxide ceramic is fixed to a molded body. Preferably, here the molded body is a wire mesh or a honeycomb structure, or the oxide ceramic on which the mixed oxide is fixed is a wash coat. Within a combustion chamber and an exhaust-gas pipe or exhaust-gas return pipe connected to this combustion chamber, a mixed oxide is fixed based on cerium oxide, titanium oxide, and chromium oxide as an oxidation catalyst.

Oxidation catalyst

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Hanau-Mittelbuchen, Germany

Ansgar Wille