Catalyst for removing nitrogen oxides, method for production...

B - Operations – Transporting – 01 – J

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B01J 23/30 (2006.01) B01D 53/86 (2006.01) B01D 53/94 (2006.01) B01J 21/06 (2006.01) B01J 23/10 (2006.01) B01J 37/02 (2006.01)

Patent

CA 2486158

Disclosed is a method for producing a catalyst for removing nitrogen oxides which comprises dispersing a hydrated titanium (Ti) oxide or dried material thereof, tungstic acid or a salt thereof, and cerium (Ce) dioxide in a dispersion medium to form a sol-like material, mixing the sol-like material with an aqueous medium to form a catalyst slurry or paste, supporting the catalyst slurry or paste on a catalyst carrier, and then calcinating the carrier; in which catalyst the Ce dioxide is prevented from being embedded in the Ti oxide to realize such a high degree of dispersion of the Ce dioxide on the surface of the Ti oxide as comparable with the case wherein cerium ions are dispersed in micro voids of a zeolite by ion exchange; and the catalyst is free from the occurrence of such phenomena as sintering of the Ti oxide, and deterioration of zeolite with steam when a zeolite is used as carrier.

L'invention concerne un procédé de production d'un catalyseur permettant d'ôter des oxydes d'azote et consistant à disperser de l'oxyde de titanium hydraté ou un matériau séché à partir de ce dernier, de l'acide tungstique ou un sel correspondant, et du dioxyde de cérium de manière à former un matériau de type sol, à mélanger le matériau de type sol avec un milieu aqueux afin de préparer une boue ou une pâte catalysante, et à permettre à un excipient de porter la boue ou la pâte dessus, suivi de la cuisson. Ce procédé empêche que l'oxyde de Ce ne soit enterré dans de l'oxyde de Ti et permet d'obtenir une dispersion à degré élevé d'oxyde de Ce sur la surface d'oxyde de titanium, ce degré étant comparable à l'utilisation d'un zéolite échangeur d'ions, et permet également la production d'un catalyseur permettant d'ôter des oxydes d'azote libérés du frittage de l'oxyde de titanium, de la détérioration d'un zéolite en raison de la vapeur, et autre similaire.

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