Exhaust gas catalyst

B - Operations – Transporting – 01 – J

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B01J 23/22 (2006.01) B01D 53/94 (2006.01) B01J 23/10 (2006.01)

Patent

CA 2545332

Catalyst composition represented by the general formula REVO/S wherein RE is at least one of the group of rare earth metals Y, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Er and Yb in an amount of up to 6.0 wt.-%; V is vanadium in an amount of 0.2- 2.5 wt.-%; O is oxygen in an amount of up to 3,5 wt.-%; and S is a support containing TiO2 in an amount of at least 70 wt.-%, with the rest being WO3 and optionally SiO2. This catalyst composition shows high removal efficiencies for NOx even after aging at 750~C.

L'invention concerne une composition catalytique représentée par la formule générale REVO/S, dans laquelle RE est au moins un des groupes des métaux des terres rares Y, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Er et Yb présent selon une quantité pouvant atteindre 6,0 % en poids; V est vanadium selon une quantité de 0,2 à 2,5 % en poids; O est oxygène selon une quantité pouvant atteindre 3,5 % en poids; et S est un support contenant TiO¿2? selon une quantité d'au moins 70 % en poids; le reste étant composé de WO¿3? et éventuellement de SiO¿2?. Cette composition catalytique présente une haute efficacité de retrait du NO¿x?, même après vieillissement à 750 ·C.

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