Catalyst for purifying exhaust gas

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

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502327, 502331, 502334, B01J 2358

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active

059069597

ABSTRACT:
This invention relates to a catalyst for purifying an exhaust gas using a complex oxide having good heat-resistant and a purification performance which does not undergo degradation, particularly in a lean atmosphere at a high temperature of about 1,000.degree. C., by using the complex oxide containing platinum and at least one member of element selected from the group from an alkaline earth metal element and the Group IIIA element and, furthermore, by using at least one member of platinum complex oxides selected from the group of those Pt complex oxides expressed by the chemical structural formulas X.sub.4 PtO.sub.6 (X=Ca, Sr, Ba, Mg), X'.sub.2 Pt.sub.2 O.sub.7 (X'=Sc, La, Pr), SrX"PtO.sub.6 (X"=Co, Ni, Cu), Ba.sub.2 ZPtO.sub.6 (Z=Pr, Ce) and Ba.sub.8 Y.sub.3 Pt.sub.4 O.sub.17.5.

REFERENCES:
patent: 4134852 (1979-01-01), Volin
patent: 4522706 (1985-06-01), Wheelock et al.
patent: 4959339 (1990-09-01), Arai
patent: 5384110 (1995-01-01), Muramatsu et al.
patent: 5439865 (1995-08-01), Abe et al.
L. Ben-Dor, et al. "The Growth Of Single Crystals of Sr.sub.4 PtO.sub.6 " Journal of Crystal Growth, vol. 64, 1983 pp. 395-396 North-Holland Publishing Company.
Y. Laligant, et al., "Synthesis and Single-Crystal Refinement Of Ba.sub.2 Y.sub.2 CuPtO.sub.8.", Europhyics Letters, vol. 4, No. 9, pp. 1023-1029 (1987).
Database WPI, AN 88-016561 & JP-A-62 277 150, Dec. 2, 1987.

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