COMPOSITION BASED ON OXIDES OF ZIRCONIUM, CERIUM AND LANTHANUM AND OF YTTRIUM, GADOLINIUM OR SAMAR

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Catalyst/catalyst support composition essentially consist of oxides of zirconium, cerium and lanthanum and of another rare earth selected from among yttrium, gadolinium and samarium, having a proportion of the lanthanum oxide and the oxide of the other rare earth of at least 15% and specific surfaces of at least 40 m2/g and at least 15 m2/g after calcination respectively for 4 hours at 1, 000° C. and 10 hours at 1, 150° C.; after calcination for 10 hours at 1, 200° C. these have a surface of at least 7 m2/g and such surface is at least 5 m2/g for an embodiment in which after 10 hours of calcination at 1, 150° C. the composition is in the form of a pure solid solution.