Patent ID: 6287527
Filing Date: 2001-09-11
Classification: B01D,B01J,Y02T

Abstract:
A method for controlling emission of exhaust comprising bringing exhaust containing hydrocarbon and nitrogen oxide in a mole ratio (hydrocarbon/nitrogen oxide) within a range of 0.5 to 30 into contact with an exhaust emission control catalyst, wherein:said exhaust emission control catalyst includes a catalytic component containing copper, praseodymium, and yttrium, and a refractory carrier for carrying the catalytic component, anda weight ratio of the copper, praseodymium and yttrium in terms of oxides thereof is arranged so that praseodymium oxide is between 0.2 to 20 weight parts, and yttrium oxide is between 0.2 to 20 weight parts based on 1 weight part of copper oxide.