COMPOSITION PRECURSOR AND CERIUM AND ZIRCONIUM MIXED OXIDE BASED COMPOSITION, METHOD FOR ITS PREPARATION AND USE THEREOF

摘要

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 cm<3>/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.