Exhaust emission control catalyst and method for controlling...

B - Operations – Transporting – 01 – J

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B01J 23/83 (2006.01) B01D 53/86 (2006.01) B01D 53/94 (2006.01)

Patent

CA 2245970

An exhaust gas purification catalyst and an exhaust gas purification method using the same which can effectively remove oxides of nitrogen in an exhaust gas containing a large amount of oxygen and reduce the amount of particulate materials formed in the exhaust gas under high temperature conditions. The catalyst comprises a catalytic component comprising copper, praseodymium, and yttrium. The method comprises bringing an exhaust gas having a molar ratio of hydrocarbons to oxides of nitrogen (hydrocarbon/nitrogen oxide) of 0.5 to 30 into contact with the above catalyst to purify the exhaust gas. This enables oxides of nitrogen in the exhaust gas to be efficiently removed by reduction while preventing the oxidation of sulfur dioxide in the exhaust gas.

L'invention concerne un catalyseur pour épuration de gaz d'échappement et un procédé d'épuration de gaz de combustion ayant recours audit catalyseur, permettant d'éliminer de façon efficace les oxydes d'azote présents dans un gaz d'échappement renfermant une grande proportion d'oxygène, et de réduire la proportion de matériaux particulaires formés dans le gaz d'échappement à haute température. Ce catalyseur comprend un constituant catalytique contenant du cuivre, du praséodyme et de l'yttrium. Ledit procédé consiste à mettre en contact un gaz d'échappement présentant un rapport molaire hydrocarbures/oxydes d'azote de 0,5 à 10, avec le catalyseur mentionné ci-dessus pour épurer ce gaz d'échappement. Ce procédé permet d'éliminer de façon efficace les oxydes d'azote présents dans le gaz d'échappement, par réduction, tout en empêchant l'oxydation de l'anhydride sulfureux dans le gaz d'échappement.

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