Catalyst arrangement and method of purifying the exhaust gas...

Details Catalyst arrangement and method of purifying the exhaust gas... Catalyst arrangement and method of purifying the exhaust gas...

B - Operations, Transporting

01

D

B01D 53/94 (2006.01) F01N 3/28 (2006.01)

Patent

CA 2534806

The invention relates to a catalyst arrangement for purifying the exhaust gases of internal combustion engines operated under lean conditions. It is proposed that a thinwalled, porous carrier be coated on one side with a nitrogen oxide storage catalyst and on the other side with an SCR catalyst. When the exhaust gas is passed through the catalytic coatings and the support material, a significant improvement in the nitrogen oxide conversion is achieved compared to a series arrangement of the catalysts on separate carriers. Wall flow filters have been found to be useful as thin-walled carriers.

L'invention concerne un ensemble catalyseur destiné à purifier des gaz d'échappement de moteurs à combustion interne actionnés dans des conditions pauvres. Plus spécifiquement, un support poreux est revêtu sur un côté avec un catalyseur à stockage d'oxyde d'azote et sur l'autre côté avec un catalyseur à réduction sélective catalytique (SCR). Lorsque le gaz d'échappement passe à travers ces revêtements catalytiques et le matériau de support, une amélioration significative de la conversion d'oxyde d'azote est obtenue comparée à des ensembles de séries de catalyseurs situés sur des supports séparés. Des filtres d'écoulement sur paroi se sont montrés utiles en tant que supports à paroi fine.

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