COMPOSITION A SUPPORT A BASE D'UN OXYDE DE CERIUM, D'UN OXYDE DE ZIRCONIUM ET D'UN OXYDE DE SCANDIUM OU DE TERRE RARE ET UTILISATION POUR LE TRAITEMENT DES GAZ D'ECHAPPEMENT

摘要

A composition is disclosed for reducing nitrogen oxide emissions from gases which comprises a support based on a cerium oxide, a zirconium oxide and an oxide of scandium or a rare earth other than cerium, and a supported phase based on manganese and at least one other element which is an alkali metal, alkaline-earth metal or a rare earth.