Catalyst for removal of nitrogen oxide, and method for...

B - Operations – Transporting – 01 – J

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B01J 35/10 (2006.01) B01D 53/94 (2006.01) B01J 29/14 (2006.01) F01N 3/10 (2006.01)

Patent

CA 2661635

The object is to prevent the poisoning of a nitrogen oxide removal catalyst (i.e., a catalyst for removing a nitrogen oxide from an exhaust gas containing the nitrogen oxide) by a phosphorus compound contained in the exhaust gas. Thus, disclosed are: a nitrogen oxide removal catalyst having excellent durability; and a method for removing a nitrogen oxide. Specifically disclosed is a catalyst comprising a porous material having a controlled pore size and an active ingredient carried inside of a pore of the porous material. The pore of the porous material may have a diameter of 8 to 9 ~. Preferably, the diameter of the pore is 8 to 9 ~ as measured by a gas adsorption method which can measure a pore size ranging from 3.4 to 14 ~ or as calculated from a crystalline structure. Alternatively, the porous material may be a mesoporous silica. Preferably, the mesoporous silica has a primary particle diameter of 150 to 300 nm.

La présente invention concerne la prévention d'empoisonnement d'un catalyseur d'élimination d'oxyde d'azote (c'est à dire, un catalyseur d'élimination d'oxyde d'azote à partir d'un gaz d'échappement contenant de l'oxyde d'azote) par un composé phosphore contenu dans le gaz d'échappement. L'invention concerne donc un catalyseur d'élimination d'oxyde d'azote ayant une excellente durabilité; ainsi qu'un procédé d'élimination d'oxyde d'azote. D'une manière spécifique, l'invention concerne un catalyseur comportant un matériau poreux ayant une taille de pores contrôlée et un agent actif contenu dans le pore du matériau poreux. Le pore du matériau poreux peut avoir un diamètre de 8 à 9 ~. De préférence le diamètre du pore est de 8 à 9 ~ tel que mesuré par un procédé d'adsorption de gaz pouvant mesurer une taille de pore comprise entre 3,4 et 14 ~ ou tel que calculé à partir d'une structure cristalline. En variante, le matériau poreux peut être une silice mésoporeuse. De préférence, la silice mésoporeuse présente un diamètre de particules primaire compris entre 150 et 300 nm.

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