Composition precursor and cerium and zirconium mixed oxide...

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 35/10 (2006.01) C01F 17/00 (2006.01) C01G 25/00 (2006.01)

Patent

CA 2178834

Method for the preparation of a cerium and zirconium mixed oxide based composition. The method is characterized by the following stages: a liquid mixture is prepared comprising cerium and zirconium compounds; said mixture is placed in contact with a carbonate or bicarbonate and a reactive medium is formed having, during the reaction, a neutral or basic pH, the resulting precipitate is then recovered. A cerium and zirconium mixed oxide based composition is obtained by calcining this precursor. The composition is characterized by having a total porous volume of at least 0.6 cm3/g and in that at least 40 %, and more particularly 50 %, of the total porous volume is provided by pores having a diameter of a maximum of 1 'mu'm.

L'invention concerne un procédé de préparation d'un précurseur d'une composition à base d'un oxyde mixte de cérium et de zirconium, caractérisé par les étapes suivantes: on prépare un mélange liquide comprenant des composés du cérium et du zirconium; on met en contact le mélange précédent avec un carbonate ou un bicarbonate et on forme un milieu réactionnel présentant pendant la réaction un pH neutre ou basique; on récupère le précipité obtenu. On obtient une composition à base d'un oxyde mixte de cérium et de zirconium en calcinant ce précurseur. Cette composition est caractérisée en ce qu'elle présente un volume poreux total d'au moins 0,6 cm3/g et en ce qu'au moins 40 %, plus particulièrement au moins 50 %, du volume poreux total est apporté par des pores de diamètre d'au plus 1 µm.

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