COMPOSITION CONTAINING OXIDES OF ZIRCONIUM, CERIUM AND AT LEAST ONE OTHER RARE EARTH AND HAVING A S

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The invention relates to a composition that contains zirconium oxide, cerium oxide and yttrium oxide, or zirconium oxide, cerium oxide and at least two oxides of two rare earths different from cerium in a mass proportion of at least 20 % of zirconium oxide and of at most 70 % of cerium oxide, characterized in that said composition comprises, after calcination at 900°C for 4 hours, two populations of pores having respective diameters centered, for the first population, about a value of between 20 and 40 nm and, for the second, about a value of between 80 and 200 nm. The composition can be used for processing exhaust gases of internal combustion engines.