B - Operations – Transporting – 01 – D

Patent

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B01D 53/86 (2006.01) B01D 53/94 (2006.01)

Patent

CA 2620088

The invention concerns a method for treating a gas containing nitrogen oxides (NOx) characterized in that it consists in using as NOx trap a composition based on a catalyst for oxidizing NOx into NO2 and a compound based on zirconium oxide and praseodymium oxide in a proportion of praseodymium oxide ranging between 5 wt. % and 50 wt. % of oxide. Said compound may further comprise cerium oxide. The inventive method can be used for treating exhaust gas of a Diesel or lean mixture gasoline internal combustion engine.

L'invention concerne un procédé de traitement d'un gaz contenant des oxydes d'azote (NOx) qui est caractérisé en ce qu'on utilise comme piège à NOx une composition à base d'un catalyseur d'oxydation des NOx en NO2 et d'un composé à base d'oxyde de zirconium et d'oxyde de praséodyme dans une proportion d'oxyde de praséodyme comprise entre 5 % et 50 % en poids d'oxyde. Ce composé peut comprendre en outre de l'oxyde de cérium. Le procédé de l'invention peut être utilisé dans le traitement de gaz d'échappement de moteur à combustion interne de type Diesel ou de type essence fonctionnant en mélange pauvre.

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