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SYSTEM FOR PURIFYING EXHAUST GASES SO AS TO REDUCE EMISSION OF HYDROCARBONS WHILE COLD STARTING INTERNAL COMBUSTION ENGINES
SYSTEM FOR PURIFYING EXHAUST GASES SO AS TO REDUCE EMISSION OF HYDROCARBONS WHILE COLD STARTING INTERNAL COMBUSTION ENGINES
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机译:净化排放气体的系统,以减少冷启动内燃发动机时的碳氢化合物排放
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摘要
The invention relates to an exhaust gas purification system for decreasing the emissions of hydrocarbons during the cold start of internal combustion engines. The exhaust gas purification system contains a hydrocarbon adsorber and a downstream catalyst system which can be composed of a single three-way catalyst or of a combination of oxidation, reduction and/or three-way catalysts in one or more beds. The hydrocarbon emissions during the cold start phase can be significantly decreased by using oxidation catalysts or three-way catalysts which, in comparison with conventional catalysts, have at least twice the loading of platinum and/or palladium.
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