Exhaust gas purifying catalyst and method of producing same

Details Exhaust gas purifying catalyst and method of producing same Exhaust gas purifying catalyst and method of producing same

2007-01-30

2007-01-30

Langel, Wayne A. (Department: 1754)

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

C502S303000, C502S304000, C502S328000, C502S330000

Reexamination Certificate

active

11059454

ABSTRACT:
An exhaust gas purifying catalyst for an internal combustion engine of an automotive vehicle. The exhaust gas purifying catalyst comprises a monolithic substrate. A first catalytic layer is formed on the monolithic substrate. The first catalytic layer contains at least one noble metal selected from the group consisting of rhodium, platinum and palladium, compound of at least one metal selected from the group consisting of alkali metal, alkaline earth metal and rare earth metal, and alumina. Additionally, a second catalytic layer is formed on the first catalytic layer and contains rhodium, at least one noble metal selected from the group consisting platinum and palladium, compound of at least one metal selected from the group consisting of alkali metal, alkaline earth metal and rare earth metal, and alumina. A content of the compound of the at least one metal in the second catalytic layer is larger than that in the first catalytic layer.

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