SUPPORT COMPOSITION BASED ON A CERIUM OXIDE, A ZIRCONIUM OXIDE AND A SCANDIUM OR RARE EARTH OXIDE A

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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.