Exhaust gas purification catalyst and method of producing...

B - Operations – Transporting – 01 – J

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B01J 23/31 (2006.01) B01D 53/86 (2006.01) B01J 27/199 (2006.01) B01J 37/04 (2006.01)

Patent

CA 2676953

Disclosed are: an exhaust gas purification catalyst which comprises a composition comprising oxides of titanium (Ti), molybdenum (Mo) and/or tungsten (W), vanadium (V) and bismuth (Bi), wherein the [Ti:(Mo and/or W):V] ratio is 75-98.9:1-15:0.1-10 on an atom basis and the [Bi/(Mo and/or W)] ratio is 0.1 to 0.8 on an atom basis; a method for producing the catalyst; and an exhaust gas purification method using the catalyst. The exhaust gas purification catalyst is less likely to be deteriorated when a volatile catalyst-poisoning compound such as P and As is accumulated, and enables to reduce the SO2 oxidation rate to a fraction of that of a conventional catalyst. Further, when used in the purification of a coal combustion gas, the exhaust gas purification catalyst can keep its activity at a high level over a long period and can keep its SO2 oxidation rate at a low level even if the coal becomes diversified.

L'invention porte sur un catalyseur de purification de gaz d'échappement qui comprend une composition comprenant des oxydes de titane (Ti), de molybdène (Mo) et/ou de tungstène (W), de vanadium (V) et de bismuth (Bi), le rapport [Ti:(Mo et/ou W):V] étant de 75-98,9:1-15:0,1-10 sur une base atomique et le rapport [Bi/(Mo et/ou W)] est de 0,1 à 0,8 sur une base atomique ; sur un procédé de fabrication du catalyseur ; et sur un procédé de purification de gaz d'échappement utilisant un catalyseur. Le catalyseur de purification de gaz d'échappement est moins susceptible d'être détérioré lorsqu'un composé volatil poison du catalyseur tel que P et As s'accumule, et permet de réduire la vitesse d'oxydation de SO2 à une fraction de celle d'un catalyseur classique. De plus, lorsqu'il est utilisé dans la purification d'un gaz de combustion du charbon, le catalyseur de purification de gaz d'échappement peut conserver son activité à un niveau élevé sur une longue période de temps et peut conserver sa vitesse d'oxydation de SO2 à un faible niveau même si le charbon se diversifie.

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