Catalyst for purifing exhaust gases

Details Catalyst for purifing exhaust gases Catalyst for purifing exhaust gases

1988-12-21

1990-05-01

Shine, W. J.

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

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

502303, 502304, 502525, 4232135, B01J 2106, B01J 2310, B01J 2358

Patent

active

049218298

ABSTRACT:
A catalyst for purifying exhaust gases comprises: a perovskite-type complex oxide represented by the general formula Ln.sub.1-x A.sub.x MO.sub.3, wherein Ln represents at least one rare earth metal, A presents at least one alkaline earth metal and M represents at least one transition metal, and 0<x<1; at least one heat resistant complex oxide; and at least one precious metal. The heat resistant complex oxide is one of ABO.sub.3, LnAlO.sub.3 or Ln.sub.2 B.sub.2 O.sub.7, wherein A represents at least one alkaline earth metal, B represents at least one of Ti, Zr and Hf, and Ln represents at least one rare earth metal, and the precious metal is at least one of Pt, Pd, Rh, Ir, Ru and Os. The catalyst is usable as a temperature of 900.degree. C. or above without sintering or reduction of a catalytic activity.

REFERENCES:
patent: 3905918 (1975-09-01), Mai et al.
patent: 4089810 (1978-05-01), Diwell et al.
patent: 4151123 (1979-04-01), McCann

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