Composition containing zirconium, cerium and yttrium oxides, useful for the treatment of exhaust f

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The composition of the invention is containing zirconium oxide in a mass proportion of to the moins25%, and it includes/understands between 15% and 60% of cerium oxide, between 10% and 25% of yttrium oxide, between 2% et10% of lanthanum oxide and between 2% and oxide 15% of another rare earth; it. present moreover, aprescalcination 10 hours with 1150°C, a specific surface of at least 15 m2/g as well as a cubic phase. Elleest obtained by forming a mixture including/understanding of composed of zirconium, cerium, yttrium, dulanthane and of additional rare earth; by precipitating this mixture with a base; while heating into milieuaqueux the aforementioned precipitate; by adding surface-active to it and by calcining the precipitate. This peutêtre composition used as catalyst.