Exhaust gas purification system for reducing hydrocarbon...

F - Mech Eng,Light,Heat,Weapons – 01 – N

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F01N 3/20 (2006.01) B01D 53/04 (2006.01) B01D 53/94 (2006.01) F01N 3/08 (2006.01) F01N 13/02 (2010.01) F02B 1/04 (2006.01) F01N 7/02 (2006.01)

Patent

CA 2110139

The invention relates to an exhaust gas purification system for reducing hydrocarbon emissions during the cold start of combustion engines. The exhaust gas purification system contains a hydrocarbon adsorber and a downstream catalyst system which may comprise one individual three-way catalyst or a combination of oxidation, reduction and/or three-way catalysts in one or more beds . The hydrocarbon emissions during the cold start phase may be reduced considerably by using oxidation or three-way catalysts which have at least twice the loading with platinum and/or palladium compared with conventional catalyst.

L'invention a trait à un système de purification des gaz d'échappement en vue de réduire les émissions d'hydrocarbures au cours du démarrage à froid des moteurs à combustion. Le système comprend un adsorbeur d'hydrocarbures et un système de catalyse qui peut comprendre un seul catalyseur à trois voies ou une combinaison de catalyseur d'oxydation, de catalyseur de réduction et/ou de catalyseur à trois voies dans un ou plusieurs lits. Les émissions d'hydrocarbures au cours du démarrage à froid peuvent être réduites sensiblement en utilisant des catalyseurs d'oxydation ou des catalyseurs à trois voies dont la capacité de charge avec du platine et/ou du palladium est au moins deux fois supérieure à celle des catalyseurs classiques.

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