REDOX LOOP METHOD IN WHICH A COMPOSITION COMPRISING OXIDES OF CERIUM, OF A RARE EARTH OTHER THAN CE

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The invention relates to a redox loop method characterised in that, by way of a redox mass, it uses a mass comprising a composition which contains cerium oxide and either : consists essentially of cerium oxide and at least one oxide of another rare earth, with a specific surface area of at least 20 m2/g after calcination at 1000°C for 5 hours; or which contains cerium oxide, zirconium oxide and, optionally, at least one oxide of a rare earth other than cerium.