Nox storage materials and traps resistant to thermal aging

Details Nox storage materials and traps resistant to thermal aging Nox storage materials and traps resistant to thermal aging

B - Operations, Transporting

01

J

B01J 37/00 (2006.01) B01D 53/94 (2006.01) B01J 23/10 (2006.01) B01J 23/63 (2006.01)

Patent

CA 2671020

Nitrogen oxide storage materials and methods of manufacturing nitrogen oxide storage materials are disclosed. The nitrogen oxide storage materials can be used to manufacture catalytic trap disposed in an exhaust passage of an internal combustion engine which is operated periodically between lean and stoichiometric or rich conditions, for abatement of NOx in an exhaust gas stream which is generated by the engine. In one embodiment, the nitrogen oxide storage material comprises alkaline earth material supported on ceria particles having a crystallite size of between about 10 and 20 nm and the alkaline earth oxide having a crystallite size of between about 20-40 nm.

L'invention concerne des matériaux de stockage d'oxyde d'azote et des procédés de fabrication de ces matériaux. Les matériaux de stockage d'oxyde d'azote peuvent être utilisés pour fabriquer un piège catalytique placé dans l'échappement d'un moteur à combustion interne qui passe périodiquement de conditions pauvres à des conditions stAEchiométriques ou riches, pour lutter contre le NOx dans le courant de gaz d'échappement généré par le moteur. Dans un mode de réalisation, le matériau de stockage d'oxyde d'azote comprend un matériau alcalino-terreux reposant sur des particules d'oxyde de cérium avec une taille de cristallites comprise entre environ 10 et 20 nm, l'oxyde alcalino-terreux ayant une taille de cristallites comprise entre environ 20 et 40 nm.

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