Layered catalyst composite

B - Operations – Transporting – 01 – J

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Details

B01J 23/63 (2006.01) B01D 53/94 (2006.01) B01J 37/02 (2006.01)

Patent

CA 2661564

A layered, three-way conversion catalyst having the capability of simultaneously catalyzing the oxidation of hydrocarbons and carbon monoxide and the reduction of nitrogen oxides is disclosed. In one or more embodiments, the catalyst comprises three layers in conjunction with a carrier: a first layer deposited on the carrier and comprising palladium deposited on a refractory metal oxide and an oxygen storage component; a second layer deposited on the first layer and comprising rhodium deposited on a refractory metal oxide and an oxygen storage component; and a third layer deposited on the second layer and comprising palladium deposited on a refractory metal oxide.

L'invention concerne un catalyseur de conversion trois voies multicouche ayant la capacité de catalyser simultanément l'oxydation d'hydrocarbures et du monoxyde de carbone et la réduction d'oxydes d'azote. Dans un ou plusieurs modes de réalisation, le catalyseur comprend trois couches combinées à un support : une première couche déposée sur le support et comprenant du palladium déposé sur un oxyde de métal réfractaire et un composant de stockage de l'oxygène; une seconde couche déposée sur la première couche et comprenant du rhodium déposé sur un oxyde de métal réfractaire et un composant de stockage de l'oxygène; et une troisième couche déposée sur la seconde couche et comprenant du palladium déposé sur un oxyde de métal réfractaire.

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