COMPOSITION BASED ON ZIRCONIUM OXIDE AND ON AT LEAST ONE OXIDE OF A RARE EARTH OTHER THAN CERIUM, H

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The composition of the invention is based on zirconium oxide and on at least one oxide of a rare earth other than cerium, in a zirconium oxide weight proportion of at least 50%, and it is characterized in that it has, after calcination at a temperature of 900°C for 4 hours, two populations of pores, the respective diameters of which are centred in the first case, around a value of between 20 and 40 nm and, in the second case, around a value of between 80 nm and 200 nm. The composition may be used for treating the exhaust gases of internal combustion engines.