초록 ▼

Exhaust emission control catalysts capable of efficiently removing nitrogen oxide in exhaust containing a large amount of oxygen emitted from a diesel engine and the like and reducing the generation of particulate matter in the exhaust under high temperature conditions, and a method for controlling

Exhaust emission control catalysts capable of efficiently removing nitrogen oxide in exhaust containing a large amount of oxygen emitted from a diesel engine and the like and reducing the generation of particulate matter in the exhaust under high temperature conditions, and a method for controlling the emission of exhaust using the exhaust emission control catalysts. The exhaust emission control catalysts contain copper, praseodymium, and yttrium. The method for controlling the emission of exhaust purifies exhaust containing hydrocarbon and nitrogen oxide in a mole ratio (hydrocarbon/nitrogen oxide) within a range of 0.5 to 30 by bringing the exhaust into contact with the exhaust emission control catalysts. It is possible to efficiently remove nitrogen oxide in the exhaust by reduction while suppressing the oxidation of sulfur dioxide in the exhaust.

대표청구항 ▼

[ What is claimed is:] [1.]1. 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 emiss

[ What is claimed is:] [1.]1. 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.