Bifunctional catalysts for selective ammonia oxidation

B - Operations – Transporting – 01 – J

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B01J 23/42 (2006.01) B01J 23/89 (2006.01) B01J 29/72 (2006.01) B01J 29/74 (2006.01) B01J 35/00 (2006.01) B01J 35/04 (2006.01)

Patent

CA 2679599

Catalysts, methods, and systems for treating diesel engine exhaust streams are described. In one or more embodiments, the catalyst comprises platinum, a second metal from one of the groups VB, VIB, VIIB, VIIIB, IB, or IIB of the periodic table, a refractory metal oxide, and a zeolite, the oxidation catalyst already being effective to remove ammonia at temperatures less than about 300°C and exhibiting no significant decrease in ammonia oxidation efficiency upon hydrothermal aging. A method aspect includes first passing a vehicle's engine exhaust stream through a NOx abatement catalyst; and passing the exhaust stream exiting the NOx abatement catalyst and containing ammonia through the ammonia oxidation catalyst. Systems including such catalysts are also provided.

L'invention concerne des catalyseurs, des procédés et des systèmes pour traiter les flux d'échappement d'un moteur diesel. Dans un ou plusieurs modes de réalisation, le catalyseur comprend le platine, un second métal de l'un des groupes VB, VIB, VIIB, VIIIB, IB ou IIB du tableau périodique, un oxyde de métal réfractaire et une zéolite, le catalyseur d'oxydation étant déjà efficace pour éliminer l'ammoniac à des températures inférieures à environ 300°C et ne présentant aucune diminution significative du rendement d'oxydation d'ammoniac lors d'un vieillissement hydrothermique. Un aspect du procédé comprend d'abord le fait de passer un flux d'échappement du moteur d'un véhicule à travers un catalyseur d'abaissement de NOx; et le fait de passer le flux d'échappement quittant le catalyseur d'abaissement de NOx et contenant de l'ammoniac à travers le catalyseur d'oxydation d'ammoniac. Les systèmes comprenant de tels catalyseurs sont également proposés.

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