초록 ▼

A stable, close-coupled catalyst, an article comprising the close-coupled catalyst and a related method of operation. The close-coupled catalyst comprises a catalyst support and a palladium catalytic component. Preferably and optionally, there are stabilizers including alkaline metal oxide, and rare

A stable, close-coupled catalyst, an article comprising the close-coupled catalyst and a related method of operation. The close-coupled catalyst comprises a catalyst support and a palladium catalytic component. Preferably and optionally, there are stabilizers including alkaline metal oxide, and rare earth metal components selected from the neodymium and lanthanum components. The close-coupled catalyst composition includes substantially no additional oxygen storage component such as praseodymium or cerium compounds. There is preferably a catalyst such as a three-way catalyst downstream of the close-coupled catalyst. The downstream catalyst preferably includes an oxygen storage component such as cerium oxide or praseodymium oxide.

대표청구항 ▼

[ What is claimed is:] [1.] An article comprising:a gasoline engine having an exhaust outlet and optionally an exhaust manifold outlet;a close coupled catalyst located less than about one foot from the engine exhaust outlet or exhaust manifold outlet and in communication with the exhaust outlet to b

[ What is claimed is:] [1.] An article comprising:a gasoline engine having an exhaust outlet and optionally an exhaust manifold outlet;a close coupled catalyst located less than about one foot from the engine exhaust outlet or exhaust manifold outlet and in communication with the exhaust outlet to be exposed to temperatures including at least 920.degree. C., the close coupled catalyst comprising a close coupled catalyst composition having substantially no oxygen storage components selected from the group consisting of cerium components and praseodymium components, the catalyst composition comprising:a support; anda palladium component; anda downstream catalyst located downstream of and in communication with the close-coupled catalyst, the downstream catalyst comprising an oxygen storage component selected from the group consisting of cerium components and praseodymium components.