Support composition based on a cerium oxide, a zirconium...

Details Support composition based on a cerium oxide, a zirconium... Support composition based on a cerium oxide, a zirconium...

B - Operations, Transporting

01

D

B01D 53/94 (2006.01) B01J 23/10 (2006.01) B01J 23/34 (2006.01) B01J 35/00 (2006.01)

Patent

CA 2310123

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.

La présente invention concerne une composition caractérisée en ce qu'elle comprend un support à base d'un oxyde de cérium, d'un oxyde de zirconium et d'un oxyde de scandium ou de terre rare autre que le cérium et une phase supportée à base de manganèse et d'au moins un autre élément choisi parmi les alcalins, les alcalino-terreux et les terres rares. Cette composition peut fonctionner comme piège à NOx et elle peut donc être utilisée dans un procédé de traitement de gaz en vue de la réduction des émissions des oxydes d'azote, notamment de gaz d'échappement présentant un excès d'oxygène.

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