Zirconium/cerium mixed oxide catalyst/catalyst support compositi

Details Zirconium/cerium mixed oxide catalyst/catalyst support compositi Zirconium/cerium mixed oxide catalyst/catalyst support compositi

1994-02-10

1996-07-02

McFarland, Anthony

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

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

502303, 502349, 502355, 502439, 502351, B01J 2310

Patent

active

055321984

ABSTRACT:
Zirconium/cerium mixed oxides (optionally including thermally stabilizing dopant values), comprising solid solutions thereof, having contents of zirconium of up to 99% by weight, and having high specific surface areas, are well suited as catalysts and/or catalyst supports, notably for the treatment/conversion of vehicular exhaust gases; such ZrO.sub.2 /CeO.sub.2 mixed oxides are conveniently prepared by (i) intimately admixing a zirconium sol with a cerium sol, the ratio r of the mean diameter r.sub.1 of the particles of the zirconium sol to the diameter r.sub.2 of the particles of the cerium sol being at least 5, (ii) spray drying the admixture thus obtained, and (iii) calcining the dried material.

REFERENCES:
patent: 4731234 (1988-03-01), Wada et al.
patent: 4820667 (1989-04-01), Tsunekawa
patent: 5004711 (1991-04-01), Grodek
patent: 5091348 (1992-02-01), Woodhead et al.
patent: 5275759 (1994-01-01), Osaka et al.

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