Nitrogen oxide-reducing catalyst and process for reducing...

B - Operations – Transporting – 01 – J

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B01J 29/76 (2006.01) B01D 53/56 (2006.01) B01D 53/86 (2006.01) B01D 53/94 (2006.01)

Patent

CA 2192935

The present invention provides a NOx reducing catalyst comprising BEA zeolite which is ion-exchanged with Co to have a Co/Al ratio between 0.2 and 0.6 and is loaded with at least one metal selected from among Ca, Sr, Ba, La, Mn, Ag, In, and Ni. The present invention also provides a NOx reduction process comprising the use of the catalyst of the present invention. The catalyst of this invention provides high activity, high NOx reduction selectivity and durability at low temperature in an actual exhaust gas containing water vapor and other substances disturbing catalytic activity even at low temperature and at low NOx and hydrocarbon concentration.

Catalyseur réducteur du NOx renfermant une zéolite BEA subissant un échange d'ions avec Co pour obtenir un rapport Co/Al situé entre 0,2 et 0,6 avant d'être chargé d'au moins un métal choisi dans le groupe CA, Sr, Ba, La, Mn, Ag, In et Ni. L'invention porte également sur un procédé de réduction de NOx prévoyant l'utilisation du catalyseur visé par cette même invention. Ce catalyseur se caractérise par une activité élevée, une haute sélectivité de réduction de NOx, une grande longévité à basse température dans des gaz d'échappement effectifs renfermant de la vapeur d'eau et d'autres substances perturbant l'activité catalytique même à basse température et pour de faibles taux de concentration de NOx et d'hydrocarbure.

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