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

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B01J 23/10 (2006.01) B01D 53/92 (2006.01) B01D 53/94 (2006.01) C01G 25/00 (2006.01) C01G 25/02 (2006.01)

Patent

CA 2224409

A zirconium oxidebased composition containing cerium oxide and having a specific surface area of at least 30 m?2¿/g after calcining for six hours at 900 ·C. The composition is a pure solid solution of cerium oxide in zirconium oxide. In an alternative embodiment, the composition may further include a doping element and have a specific surface area of at least 25 m?2¿/g after calcining for six hours at 1000 ·C. A method for preparing such compositions is also disclosed, wherein a mixture containing a zirconium compound and a cerium IV compound is prepared in a liquid medium; the mixture is heated to over 100 ·C; after heating, the resulting reaction medium is adjusted to a basic pH; the resulting precipitate is recovered; and said precipitate is calcined. If required, the doping element is added to the starting liquid mixture or to the reaction mixture obtained after the heating step.

L'invention concerne une composition à base d'oxyde de zirconium et comprenant de l'oxyde de cérium, possédant une surface spécifique d'au moins 30m2/g après calcination 6 heures à 900 ~C et se présentant sous la forme d'une solution solide pure de l'oxyde de cérium dans l'oxyde de zirconium. Suivant un autre mode de réalisation, cette composition peut comprendre en outre un élément dopant et présenter une surface spécifique d'au moins 25 m2/g après calcination 6 heures à 1000 ~C. Un procédé de préparation de ces compositions comprend les étapes suivantes: on prépare un mélange en milieu liquide contenant un composé du zirconium et un composé du cérium IV; on chauffe ledit mélange à une température supérieure à 100 ~C; on amène le milieu réactionnel obtenu à l'issue du chauffage à un pH basique; on récupère le précipité ainsi obtenu; on calcine ledit précipité; l'élément dopant étant, le cas échéant, ajouté soit au mélange en milieu liquide de départ soit au mélange réactionnel obtenu à l'issue du chauffage.

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