B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
B01J 23/58 (2006.01) B01D 53/86 (2006.01) B01D 53/94 (2006.01) B01J 35/04 (2006.01) F01N 3/08 (2006.01) F01N 3/10 (2006.01) F01N 3/24 (2006.01) F01N 3/28 (2006.01) B01J 20/04 (2006.01)
Patent
CA 2626964
An exhaust gas purification apparatus for diesel engine that is enhanced in NOx purification performance and PM purification performance. There is provided an exhaust gas purification apparatus comprising upstream catalyst (3) of straight flow structure carrying a first NOx occluding material capable of effectively occluding NOx in a low temperature region and carrying a noble metal; midstream catalyst (4) of straight flow structure carrying a second NOx occluding material capable of effectively occluding NOx in an intermediate temperature region and carrying a noble metal; and downstream catalyst (5) of wall flow structure carrying a third NOx occluding material capable of effectively occluding NOx in a high temperature region and carrying a noble metal. Enhancing of the NOx purification performance and PM purification performance can be attained as the three types of catalysts individually occlude NOx satisfactorily in correspondence to exhaust gas temperatures.
La présente invention concerne un appareil d~épuration des gaz d~échappement pour moteur diesel, dont l~efficacité en matière d~épuration de NOx et PM est accrue. L~appareil d~épuration des gaz d~échappement selon l~invention comprend un catalyseur en amont (3) de structure à écoulement rectiligne, contenant un premier matériau d~absorption de NOx capable d~absorber efficacement le NOx dans une région de basse température et contenant un métal noble, un catalyseur médian (4) de structure à écoulement rectiligne contenant un second matériau d~absorption de NOx capable d~absorber efficacement le NOx dans une région de température intermédiaire et contenant un métal noble, ainsi qu~un catalyseur en aval (5) de structure à écoulement de paroi contenant un troisième matériau d~absorption de NOx capable d~absorber efficacement le NOx dans une région de température élevée et contenant un métal noble. Comme les trois types de catalyseurs absorbent individuellement le NOx de façon satisfaisante en fonction des températures des gaz d~échappement, il est possible d~accroître l~efficacité en matière d~épuration de NOx et d~épuration de PM.
Gowling Lafleur Henderson Llp
Toyota Jidosha Kabushiki Kaisha
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