Exhaust gas treatment catalyst and exhaust gas treatment system

B - Operations – Transporting – 01 – J

Patent

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Details

B01J 23/652 (2006.01) B01D 53/86 (2006.01) B01D 53/94 (2006.01) B01J 37/02 (2006.01) B01J 37/04 (2006.01)

Patent

CA 2677060

Disclosed is an exhaust gas treatment catalyst which enables to reduce the thickness of a coat layer relative to the thickness of a catalyst base material, and also enables to reduce the ratio of the amount of leaked ammonia while keeping the NOx reduction rate at a satisfactory level. Also disclosed is an exhaust gas treatment system. Specifically disclosed is an exhaust gas treatment catalyst which can remove a nitric oxide contained in the exhaust gas in a catalytic manner by utilizing ammonia as a reducing agent and can decompose and remove unreacted ammonia. The exhaust gas treatment catalyst comprises: a porous catalyst base material comprising at least one member selected from an oxide of vanadium (V), an oxide of tungsten (W) and an oxide of molybdenum (Mo) and titania; and a coat layer formed on the surface of the porous catalyst base material and comprising titania having platinum carried thereon.

L'invention porte sur un catalyseur de traitement de gaz d'échappement permettant de réduire l'épaisseur d'une couche de revêtement par rapport à l'épaisseur d'une matière de base de catalyseur, et le rapport de la quantité d'ammoniac échappé tout en conservant le taux de réduction de NOx à un niveau satisfaisant. L'invention porte également sur un système de traitement de gaz d'échappement. De façon spécifique, l'invention porte sur un catalyseur de traitement de gaz d'échappement qui peut retirer un oxyde nitrique contenu dans le gaz d'échappement d'une manière catalytique par utilisation d'ammoniac comme agent réducteur et peut décomposer et retirer l'ammoniac n'ayant pas réagi. Le catalyseur de traitement de gaz d'échappement comprend : une matière de base catalytique poreuse comprenant au moins un élément choisi parmi un oxyde de vanadium (V), un oxyde de tungstène (W) et un oxyde de molybdène (Mo) et de l'oxyde de titane ; et une couche de revêtement formée sur la surface de la matière de base catalytique poreuse et comprenant de l'oxyde de titane ayant du platine porté sur celui-ci.

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