Composition based on zirconium, cerium and tin oxides,...

C - Chemistry – Metallurgy – 01 – G

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C01G 25/02 (2006.01) B01D 53/94 (2006.01) B01J 21/06 (2006.01) B01J 23/10 (2006.01) B01J 23/14 (2006.01) B01J 37/03 (2006.01) B01J 37/08 (2006.01) B01J 37/12 (2006.01) C01F 17/00 (2006.01) C01G 19/02 (2006.01)

Patent

CA 2554464

The invention concerns a composition based on zirconium oxide and cerium oxide and, optionally, an oxide of another rare earth, characterized in that it contains tin oxide in a proportion of more than 25 wt. % of oxide. Said composition is obtained by a method which consists in forming a mixture comprising zirconium, cerium and tin compounds and, optionally a compound of another rare earth; in bringing said mixture in the presence of a basic compound whereby a precipitate is obtained; heating said precipitate in an aqueous medium and calcining same. The composition can be used as catalyst, in particular for treating motor vehicle exhaust gases.

L'invention concerne une composition à base d'oxyde de zirconium et d'oxyde de cérium et, éventuellement, d'un oxyde d'une autre terre rare, qui est caractérisée en ce qu'elle contient de l'oxyde d'étain dans une proportion d'au plus 25% en masse d'oxyde. Elle est obtenue par un procédé dans lequel on forme un mélange comprenant des composés du zirconium, du cérium et de l'étain et, éventuellement, de l'autre terre rare; on met en présence ce mélange avec un composé basique ce par quoi on obtient un précipité; on chauffe en milieu aqueux ce précipité et on le calcine. La composition peut être utilisée comme catalyseur, notamment pour le traitement des gaz d'échappement d'automobiles.

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