Engine exhaust system for reduction of hydrocarbon emissions

Details Engine exhaust system for reduction of hydrocarbon emissions Engine exhaust system for reduction of hydrocarbon emissions

F - Mech Eng,Light,Heat,Weapons

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F01N 3/02 (2006.01) B01D 53/94 (2006.01) F01N 3/08 (2006.01) F01N 3/28 (2006.01) F02M 25/07 (2006.01) F02M 25/08 (2006.01) F01N 3/20 (2006.01)

Patent

CA 2068454

ENGINE EXHAUST SYSTEM FOR REDUCTION OF HYDROCARBON EMISSIONS Abstract of the Disclosure An engine exhaust system disclosed which is designed to reduce hydrocarbon emissions caused by the evaporation of fuel from the fuel tank and by the inefficiency of combustion and catalytic conversion during cold engine start-up. This system utilizes molecular sieves, such as high-silica zeolites, which adsorb hydrocarbons evaporating from the fuel tank or emitted during engine start-up, before the catalytic converter has attained an effective operating temperature. This system is designed so that hydrocarbons that would otherwise be emitted to the atmo- sphere from the fuel tank or by passing through the con- verter unconverted are held within the system either for combustion in the engine or passage through the converter once it is operating efficiently.

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