PROCEDE D'OXYDO-REDUCTION EN BOUCLE UTILISANT COMME MASSE OXYDO-REDUCTRICE UNE COMPOSITION A BASE D'OXYDE SUPPORTE DE CERIUM OU DE CERIUM, DE ZIRCONIUM ET/OU DE TERRE RARE

摘要

The invention relates to a redox loop method which, by way of a redox mass, uses a mass comprising a composition containing an oxide consisting of a cerium oxide or a mixture of a cerium oxide and at least an oxide of one other element selected from zirconium and rare earths other than cerium, said oxide being supported on a on a substrate containing silica, alumina, oxide of titanium or zirconium and taking the form of particles deposited on the substrate individually or as aggregates, with a maximum size of 500 nm. Following calcination at a temperature of at least 800°C for 6 hours, the composition has a reducibility value of at least 80%, measured between 50°C et 900°C.