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

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B01J 21/06 (2006.01) B01D 53/94 (2006.01) B01J 23/10 (2006.01) C01F 17/00 (2006.01) C01G 25/02 (2006.01)

Patent

CA 2645588

The composition of the invention based on zirconium and cerium oxides has a cerium oxide content of at most 50% by weight, a level of reproducibility of at least 95% after calcination in air at 600°C, and a specific surface area after calcination for 4 hours at 1100°C of at least 15 m2/g. It is prepared: by forming an aqueous mixture comprising zirconium and cerium compounds; by heating this mixture to at least 100°C and, after the heating, bringing it to a basic pH; by adding an additive of the surfactant type to the precipitate obtained from this mixture and by calcinating the precipitate in an inert gas or under vacuum at a temperature of at least 900°C and then in an oxidizing atmosphere at a temperature of at least 600°C. The composition may be used in the treatment of motor vehicle exhaust gases.

La composition de l'invention à base d'oxydes de zirconium et de cérium présente une proportion en oxyde de cérium d'au plus 50 % en masse, un taux de réductibilité d'au moins 95 % après calcination sous air à 600 °C et une surface spécifique après calcination 4 heures à 1100 °C d'au moins 15 m2/g. Elle est préparée en formant un mélange aqueux comprenant des composés du zirconium, du cérium; en chauffant ce mélange à au moins 100 °C et en l'amenant à l'issue du chauffage à un pH basique; en ajoutant un additif de type tensioactif au précipité issu de ce mélange et en calcinant ce précipité sous gaz inerte ou sous vide à une température d'au moins 900 °C puis sous atmosphère oxydante à une température d'au moins 600 °C. La composition peut être utilisée dans le traitement des gaz d'échappement d'automobiles.

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