Catalyst for purifying exhaust gas, process for producing...

B - Operations – Transporting – 01 – J

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23/353, 252/88

B01J 23/56 (2006.01) B01D 53/94 (2006.01) B01J 21/06 (2006.01) B01J 23/00 (2006.01) B01J 23/58 (2006.01) B01J 23/63 (2006.01) F01N 3/28 (2006.01) F02D 41/04 (2006.01) F01N 3/08 (2006.01)

Patent

CA 2316185

An exhaust gas purifying catalyst comprising a carrier containing rutile titania, an NOx occluding material supported on a carrier comprising at least one member selected among alkali metal, alkaline earth metal and rare earth elements, and a noble metal supported on the carrier. Since the rutile TiO2 and the NOx occluding material form a finely divided composite oxide, a catalyst poison is liable to be decomposed even when the NOx occluding material is poisoned by sulfur, and thus this material can readily recover the capability of occluding NOx. Therefore it is possible to inhibit the sulfur poisoning of the NOx occluding material and to maintain a high NOx purifying rate even after high-temperature application.

L'invention concerne un catalyseur de purification de gaz d'échappement comprenant un support contenant du rutile de titane, une matière d'occlusion de NOx disposée sur un support comprenant au moins un élément sélectionné parmi un métal alcalin, un métal alcalino-terreux et des éléments des terres rares, et un métal noble disposé sur le support. Puisque le rutile de TiO2 et la matière d'occlusion de NOx forment un oxyde composite finement séparé, un poison du catalyseur peut être décomposé même lorsque la matière d'occlusion de NOx est empoisonné par du soufre, cette matière étant donc capable de récupérer facilement la capacité d'occlusion de NOx. Il est donc possible d'inhiber l'empoisonnement par soufre de la matière d'occlusion de NOx et de maintenir un taux élevé de purification de NOx même après une application à haute température.

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