Catalysts to reduce nox in an exhaust gas stream and methods...

Details Catalysts to reduce nox in an exhaust gas stream and methods... Catalysts to reduce nox in an exhaust gas stream and methods...

B - Operations, Transporting

01

D

B01D 53/94 (2006.01) B01J 23/40 (2006.01) B01J 23/50 (2006.01) F01N 3/08 (2006.01)

Patent

CA 2664401

Catalysts, systems and methods are described to reduce NOx emissions of an internal combustion engine. In one embodiment, an emissions treatment system for an exhaust stream is provided having a catalyst comprising silver and a platinum group metal on a particulate alumina support, the atomic fraction of the platinum group metal being less than or equal to about 0.25. Methods of manufacturing catalysts are described in which silver is impregnated on alumina particles.

L'invention concerne des catalyseurs, des systèmes et des procédés pour réduire le NOx émis par un moteur à combustion interne. Dans un mode de réalisation, un système de traitement d'émissions pour un flux de gaz d'échappement est fourni. Ledit système comporte un catalyseur contenant de l'argent et un métal du groupe du platine sur un support d'alumine particulaire, la fraction atomique du métal de groupe du platine étant inférieure ou égale à environ 0,25. Des procédés de fabrication de catalyseurs sont décrits, dans lesquels de l'argent est imprégné sur des particules d'alumine.

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