Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Mixture is exhaust from internal-combustion engine
Patent
1995-05-25
1997-05-06
Caldarola, Glenn A.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Mixture is exhaust from internal-combustion engine
4232391, 42324409, 4232441, 423247, 502304, B01D 5394, B01D 5338
Patent
active
056268262
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.l 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) adding a precipitating amount of a base thereto, (iii) recovering the precipitate thus formed, and (iv) calcining the recovered precipitate.
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.
Chopin Thierry
Vilmin Gabriel
Caldarola Glenn A.
Rhone-Poulenc Chimie
Yildirim Bekir L.
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