Process for preparing zirconium-cerium-based mixed oxides

Details Process for preparing zirconium-cerium-based mixed oxides Process for preparing zirconium-cerium-based mixed oxides

B - Operations, Transporting

01

J

B01J 21/06 (2006.01) B01D 53/94 (2006.01) B01J 23/10 (2006.01) B01J 35/00 (2006.01) B01J 37/03 (2006.01) C01G 25/00 (2006.01) B01J 23/00 (2006.01) B01J 35/10 (2006.01)

Patent

CA 2465376

A process for preparing zirconium-cerium-based mixed oxides which comprises reacting an alkali with an aqueous solution of a zirconium salt containing 0.42-0.7 mole of sulphate anion (SO42-) per mole of zirconium cation at a temperature of not greater than 50 ~C, in the presence of a cerium salt to form a cerium-zirconium mixed hydroxide, and then calcining the cerium- zirconium mixed hydroxide to form a mixed oxide. The mixed oxides possess good thermal stability and are essentially single phase and are suitable as promoters and catalyst supports in, particularly, automobile exhaust systems.

L'invention concerne un procédé de préparation d'oxydes mélangés à base de zirconium et de cérium. Ce procédé consiste à faire réagir un alcali avec une solution aqueuse d'un sel de zirconium renfermant entre 0,42 et 0,7 mole d'un anion de sulfate (SO¿4??2-¿) par mole de cation de zirconium, à une température qui n'est pas supérieure à 50 ·C, en présence d'un sel de cérium, de manière à former un hydroxyde mélangé de cérium et de zirconium, et puis à calciner l'hydroxyde mélangé de cérium et de zirconium, afin de constituer un oxyde mélangé. Les oxydes mélangés présentent une bonne stabilité thermique, ils sont essentiellement en phase simple et ils sont appropriés en tant que promoteurs et supports catalytiques, notamment, des systèmes d'échappement automobiles.

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