Catalyst for purifying exhaust gases

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 53/94 (2006.01) B01D 53/86 (2006.01) B01J 23/63 (2006.01) B01J 35/04 (2006.01)

Patent

CA 2485893

A catalyst for purifying exhaust gases includes a substrate including an exhaust-gas passage, a coating layer formed on the exhaust-gas passage, and a catalytic ingredient loaded on the coating layer. A loading density of the catalytic ingredient on an upstream area discriminated from a downstream area by a predetermined length from an upstream end of the substrate is greater than a loading density of the catalytic ingredient on the downstream area. The catalytic ingredient is loaded more on the downstream area of the exhaust-gas passage than on the upstream area thereof. Thus, it is possible to suppress the catalytic ingredient being poisoned by poisoning substances.

La présente invention concerne un convertisseur catalytique pour gaz d'échappement comprenant un substrat, y compris un passage des gaz d'échappement, une couche d'enduit sur le passage des gaz d'échappement et un ingrédient catalytique chargé dans la couche d'enduit. La densité de chargement de l'ingrédient catalytique sur une zone en amont séparée de la zone en aval par une longueur prédéterminée d'une extrémité en amont du substrat est supérieure à une densité de chargement de l'ingrédient catalytique dans la zone en aval. La charge d'ingrédient catalytique est plus grande dans la zone en aval du passage des gaz d'échappement que dans la zone en amont. Il est donc possible d'en éliminer une partie de l'ingrédient catalytique qui a été contaminé par des substances toxiques.

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