Close coupled catalyst

Details Close coupled catalyst Close coupled catalyst

B - Operations, Transporting

01

D

B01D 53/94 (2006.01) B01J 23/58 (2006.01) F01N 3/20 (2006.01) F02B 1/04 (2006.01)

Patent

CA 2200430

A stable, close-coupled catalyst, an article comprising the close-coupled catalyst and a related method of operation. The close-coupled catalyst comprises a catalyst support and a palladium catalytic component. Preferably and optionally, there are stabilizers including alkaline metal oxide, and rare earth metal components selected from the neodymium and lanthanum components. The close-coupled catalyst composition includes substantially no additional oxygen storage component such as praseodymium or cerium compounds. There is preferably a catalyst such as a three-way catalyst downstream of the close- coupled catalyst. The downstream catalyst preferably includes an oxygen storage component such as cerium oxide or praseodymium oxide.

L'invention concerne un catalyseur à accouplement direct, stable, un article comprenant ce catalyseur et un procédé permettant de faire fonctionner un tel catalyseur. Le catalyseur à accouplement direct présenté comprend un support de catalyseur et du palladium comme composant catalytique. De préférence et éventuellement, ledit catalyseur comporte des stabilisants comprenant un oxyde de métal alcalin, et des métaux des terres rares choisis parmi le néodyme et le lanthane. La composition du catalyseur à accouplement direct ne comprend sensiblement aucun composant additionnel stockant l'oxygène tel que des composés de praséodyme et de cérium. En aval du catalyseur à accouplement direct, est monté, de préférence, un catalyseur tel qu'un catalyseur à trois voies. Le catalyseur monté en aval comporte de préférence un composant stockant l'oxygène tel que de l'oxyde de cérium ou de l'oxyde de praséodyme.

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