COMPOSITION CONTAINING OXIDES OF ZIRCONIUM, CERIUM AND ANOTHER RARE EARTH HAVING REDUCED MAXIMAL RE

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The invention relates to a composition containing oxides of zirconium, cerium and another rare earth different from cerium, having a cerium oxide content not exceeding 50 wt% and, after calcination at 1000°C for 6 hours, a maximal reducibility temperature not exceeding 500°C and a specific surface of at least 45 m2/g. The composition is prepared according to a method that comprises continuously reacting a mixture containing compounds of zirconium, cerium and another rare earth having a basic compound for a residence time not exceeding 100 milliseconds, wherein the precipitate is heated and contacted with a surfactant before calcination.