Diesel exhaust gas purification system and a diesel exhaust gas purification catalyst

摘要

Exhaust gas purification superior performance, in particular, I want to achieve _the NO _x purification superior performance. Diesel exhaust gas purification catalyst (1), I includes a base member (10), a catalyst layer formed on the substrate (10) on (20). A carrier, the catalyst layer (20) includes its oxide, a composite oxide of Group 4 elements and group 3 or / and one or more cerium and noble and / or supported on a carrier. (1), is used by placing the upstream side of the exhaust gas flow for the denitration catalyst for diesel exhaust gas purification catalyst.