Exhaust purification device of internal combustion engine

Details Exhaust purification device of internal combustion engine Exhaust purification device of internal combustion engine

F - Mech Eng,Light,Heat,Weapons

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F01N 3/20 (2006.01) B01D 53/94 (2006.01) F01N 3/36 (2006.01) F02D 41/04 (2006.01) F02D 43/00 (2006.01)

Patent

CA 2498568

An exhaust purification catalyst (11) for purifying NO x under a lean air-fuel ratio is arranged in exhaust passage of an internal combustion engine. As a catalyst carrier (50) of this exhaust purification catalyst (11), alumina, which has base points on the carrier surface, is used. The surface of the alumina is made to carry platinum (51) dispersed on it without forming a layer of a NO x absorbent able to absorb NO x. The air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst (11) is temporarily switched from lean to rich before the entire surface of the platinum (51) suffers from oxygen poisoning.

La présente invention un dispositif de clarification de gaz d'échappement pour un moteur à combustion interne dans lequel un catalyseur de clarification de gaz d'échappement (11) pour la clarification de NOx sous un rapport de mélange air/essence pauvre est prévu dans le passage d'un gaz d'échappement en provenance du moteur, dans lequel une alumine présentant un point de base à sa surface est utilisée en tant que support de catalyseur (50) du catalyseur de clarification de gaz d'échappement (11), du platine (51) est porté à la surface de l'alumine en phase dispersée, sans formation d'une couche d'agent d'absorption de NOx apte à l'absorption de NOx, et un rapport du mélange air/carburant pour le gaz d'échappement circulant dans le catalyseur de clarification de gaz d'échappement (11) est temporairement permuté d'un rapport pauvre à un rapport riche avant que la surface entière du platine (51) soit empoisonné par l'oxygène.

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