Patent ID: 6447735
Filing Date: 2002-09-10
Classification: B01D,B01J,F01N,Y02T,Y10T

Abstract:
An exhaust purifier disposed in an exhaust passage of an engine, comprising:a shell having an inlet and an outlet, the inlet being connected to said exhaust passage, a plurality of hydrocarbon adsorbing units (HC adsorbing units) accommodated in said shell, and a plurality of three-way catalysts accommodated in said shell, wherein, said adsorbing units and catalysts are alternately disposed in series and one of said adsorbing units is disposed immediately downstream of said inlet, wherein said HC adsorbing units and said three-way catalysts respectively have a heat capacity which increases as a respective distance from each HC adsorbing unit and each three-way catalyst to said outlet, decreases, and wherein said HC adsorbing units each has a heat capacity which is greater than a heat capacity of the three-way catalyst which is adjacent to and downstream thereof.