Catalyst for purifying exhaust gas

Details Catalyst for purifying exhaust gas Catalyst for purifying exhaust gas

1997-12-18

1999-06-08

Straub, Gary P.

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

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

423221, 423231, 423605, 423632, 502102, 502300, C01B 1716, C01G 4502, C01G 4902, B01J 2358

Patent

active

059104660

ABSTRACT:
The present invention relates to a catalyst for purifying an exhaust gas, and in particular provides a catalyst for purifying an exhaust gas using a complex oxide, which is not deteriorated in its purifying performance even in a lean atmosphere containing sulfur dioxide SO.sub.2 at temperatures as high as at least 1,000.degree. C., comprising at least one of the noble metals and one or at least two elements selected from the group consisting of alkaline earth metals and Group IIIA elements, and at least one member selected from the group consisting of iron, nickel and cobalt is supported in the surface portion of the catalyst, the catalyst further comprising, as a constituent element of the complex oxide, at least one element selected from the group consisting of iron, nickel and cobalt.

REFERENCES:
patent: 4916106 (1990-04-01), Koschlig et al.
patent: 5439865 (1995-08-01), Abe et al.
patent: 5610117 (1997-03-01), Horiuchi et al.
patent: 5622680 (1997-04-01), Monceaux et al.
patent: 5643543 (1997-07-01), Guibard et al.
patent: 5670444 (1997-09-01), Yoshida et al.

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