SUPPORT COMPOSITION BASED ON A CERIUM OXIDE, A ZIRCONIUM OXIDE AND A SCANDIUM OR RARE EARTH OXIDE AND USE FOR TREATING EXHAUST GAS

摘要

The invention concerns a composition characterised in that it comprises a support based on cerium oxide, zirconium oxide and scandium or rare earth oxide other than cerium and a supported phase based on manganese and at least another element selected among alkaline, alkaline-earth and rare earth elements. Said composition can used to trap NOx and can therefore be used in a gas treatment process for reducing nitrogen oxides, in particular exhaust gas with excess of oxygen.