COMPOSITION BASED ON OXIDES OF ZIRCONIUM, CERIUM, YTTRIUM, LANTHANUM ANH OF ANOTHER RARE EARTH, METHOD FOR PREPARING SAME AND CATALYTIC USE

摘要

The composition of the invention is based on zirconium oxide in a mass proportion of at least 25%, and it comprises between 15% and 60% of cerium oxide, between 10% and 25% of oxide of yttrium, between 2% and 10% lanthanum oxide and between 2% and 15% oxide of another rare earth; it has, in addition, after calcination for 10 hours at 1150 ° C., a specific surface area of at least 15 m 2 / g and a cubic phase. It is obtained by forming a mixture comprising compounds of zirconium, cerium, yttrium, lanthanum and the additional rare earth; precipitating this mixture with a base; by heating in an aqueous medium said precipitate; adding a surfactant and calcining the precipitate. This composition can be used as a catalyst.