Patent ID: 6171557
Filing Date: 2001-01-09
Classification: B01D,B01J,Y02T

Abstract:
A system for exhaust gas purification disposed in an exhaust pipe of an internal combustion engine, said system comprising an exhaust pipe for an internal combustion engine and installed therein a zeolite as adsorbent component capable of adsorbing hydrocarbons present in an exhaust gas emitted from the engine and a catalyst capable of reducing harmful substances present in the exhaust gas, which system satisfies the following condition:a/c=3 to 50 cc/gwherein a is a total volume of the pores of diameters of 10 .ANG. or smaller possessed by the zeolite as measured using N.sub.2, and c is a total amount of hydrocarbons emitted from the engine during a period of 140 seconds from the start of the engine when the engine is operated in accordance with the LA-4 mode of FTP.