Nitrogen oxide reducing catalyst compositions based on...

B - Operations – Transporting – 01 – D

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B01D 53/92 (2006.01) B01D 53/94 (2006.01) B01J 23/18 (2006.01) B01J 23/20 (2006.01) B01J 23/847 (2006.01)

Patent

CA 2202185

Catalyst compositions for reducing nitrogen oxide emissions during gas processing. In a first embodiment, the compositions are characterised in that they are based on at least one element selected from the group which consists of tantalum, vanadium, niobium and antimony. In a second embodiment, they are characterised in that they are based on at least one element selected from a first group which includes tantalum, vanadium, niobium and antimony, plus at least one other element selected from a second group which includes copper, silver and gold. In a third embodiment, the compositions are based on at least one element selected from a first group which includes tantalum, vanadium, niobium, antimony and copper, plus at least one other element selected from a second group which includes zinc and the elements in groups IIIb, IVb and Vb of the periodic table. In a fourth embodiment, the compositions include copper and at least one other element selected from group VIa of the periodic table.

La présente invention concerne des compositions catalytiques pour la réduction des émissions des oxydes d'azote dans le traitement d'un gaz. Selon un premier mode de réalisation de l'invention, les compositions sont caractérisées en ce qu'elles sont à base d'au moins un élément choisi dans le groupe comprenant le tantale, le vanadium, le niobium et l'antimoine. Selon un second mode, elles sont caractérisées en ce qu'elles sont à base d'au moins un élément choisi dans un premier groupe comprenant le tantale, le vanadium, le niobium et l'antimoine et d'au moins un autre élément choisi dans un deuxième groupe comprenant le cuivre, l'argent et l'or. Selon un troisième mode, les compositions de l'invention sont à base d'au moins un élément choisi dans un premier groupe comprenant le tantale, le vanadium, le niobium, l'antimoine et le cuivre, et d'au moins un autre élément choisi dans un deuxième groupe comprenant le zinc et les éléments des groupes IIIb, IVb et Vb de la classification périodique. Selon un quatrième mode, les compositions comprennent du cuivre et au moins un autre élément choisi parmi le groupe VIa de la classification périodique.

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