Composition based on cerium oxide and on zirconium oxide...

C - Chemistry – Metallurgy – 01 – G

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C01G 25/00 (2006.01)

Patent

CA 2536276

The inventive composition is based on cerium oxide and on zirconium oxide in an atomic proportion Ce/Zr of at least 1, and has a reducibility rate of at least 70 % and a surface area of at least 15 m?2¿/g. This composition is obtained by a method in which: a mixture is made containing cerium and zirconium compounds; this mixture is provided with a basic compound whereby obtaining a precipitate that is heated in an aqueous medium; a surfactant-type additive or a polyethylene glycol or a carboxylic acid is added to this medium or to the separated precipitate; the mixture is ground; the precipitate obtained thereof is calcined under inert gas or vacuum, in a first period of time, at a temperature of at least 850 ·C and then under an oxidizing atmosphere, in a second period of time, at a temperature of at least 400 ·C.

La composition de l'invention est à base d'oxyde de cérium et d'oxyde de zirconium dans une proportion atomique Ce/Zr d'au moins 1, elle présente un taux de réductibilité d'au moins 70% et une surface d'au moins 15 m2/g. Elle est obtenue par un procédé dans lequel on forme un mélange comprenant des composés de cérium et de zirconium; on met en présence ce mélange avec un composé basique ce par quoi on obtient un précipité que l'on chauffe en milieu aqueux; on ajoute à ce milieu ou au précipité séparé un additif du type tensioactif ou un polyéthylène-glycols ou un acide carboxylique; on broie; on calcine le précipité ainsi obtenu sous gaz inerte ou sous vide, dans un premier temps, à une température d'au moins 850~C puis sous atmosphère oxydante, dans un second temps, à une température d'au moins 400~C.

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