Patent ID: 6887444

Claim:
An exhaust gas purifying system for an internal combustion engine, comprising: an exhaust gas purifying catalyst including a monolithic substrate, a HC adsorbing layer for adsorbing hydrocarbons (HC), said HC absorbing layer being formed on said monolithic substrate, and a catalytic layer for producing hydrogen (H 2 ) and reducing NOx, said catalytic layer functioning to produce hydrogen (H 2 ) from at least one of hydrocarbons and carbon monoxide (CO) and to reduce nitrogen oxides (NOx) with the produced hydrogen and at least one of hydrocarbons and carbon monoxide in exhaust gas, said catalytic layer being formed on said HC adsorbing layer; and a device for controlling combustion in the engine to produce exhaust gas, to be brought into contact with said catalytic layer, having a composition meeting a relation [(a concentration of hydrogen/a concentration of total reducing components)â‰§0.3].