Exhaust gas purifying catalyst, and method for producing the...

Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide

Reexamination Certificate

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C502S328000, C502S330000, C502S332000, C502S334000, C502S339000, C502S349000, C502S350000, C502S351000, C502S355000, C502S415000, C502S439000, C502S527130, C502S304000

Reexamination Certificate

active

07867943

ABSTRACT:
An exhaust gas purifying catalyst which is made excellent in heat resistance and in S-resistance by keeping the catalytic activity of Pt particles in a satisfactory state. The exhaust gas purifying catalyst is made such that a coating layer containing a compound oxide of cerium and an oxide of a metal for stabilizing the oxide of said cerium and an oxide containing no cerium is formed on a substrate, and such that platinum particles are carried on the catalyst. Said compound oxide has a pore volume of 0.1 cc/g or more, and said platinum particles are selectively adsorbed at the electron accepting points on said compound oxide.

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