公开(公告)号：US20050188684A1

公开(公告)日：2005-09-01

申请号：US11053930

申请日：2005-02-10

申请人： Norihiro Shinotsuka ,  Osamu Kuroda ,  Yuichi Kitahara ,  Takeshi Inoue ,  Toshiufumi Hiratsuka ,  Hiroko Watanabe ,  Hidehiro Iizuka

发明人： Norihiro Shinotsuka ,  Osamu Kuroda ,  Yuichi Kitahara ,  Takeshi Inoue ,  Toshiufumi Hiratsuka ,  Hiroko Watanabe ,  Hidehiro Iizuka

IPC分类号： F01N3/02 ,  B01D53/94 ,  B01J23/58 ,  B01J23/63 ,  B01J35/04 ,  F01N3/022 ,  F01N3/08 ,  F01N3/10 ,  F01N3/24 ,  F01N3/28 ,  F01N13/02 ,  F01N3/00

CPC分类号： F01N3/0842 ,  B01D53/9422 ,  B01D53/9431 ,  B01D53/944 ,  B01D53/9477 ,  B01D2255/91 ,  F01N3/0814 ,  F01N3/101 ,  F01N13/009 ,  F01N13/0093 ,  F01N2250/02 ,  F01N2330/02 ,  F01N2330/06 ,  F01N2330/10 ,  F01N2330/12 ,  F01N2570/14 ,  Y02A50/2344 ,  Y02T10/22 ,  Y02T10/24

摘要： In an exhaust gas purifying apparatus provided with a lean NOx catalyst supporting a catalyst layer, which contains a NOx trapping component, on a honeycomb substrate formed so as not to cause an alkali attack, the invention prevents trapped NOx from being dissociated and exhausted during the time of a rich spike. A NOx reducing catalyst with the function of reducing NOx by a reductant in a rich or stoichiometric condition, e.g., a three-way catalyst, is disposed downstream of the lean NOx catalyst. In the case of increasing the amount of the NOx trapping component in the lean NOx catalyst to enhance a NOx trapping capability, even if a part of trapped NOx is dissociated during the time of the rich spike, the dissociated NOx can be reduced by the NOx reducing catalyst disposed on the downstream side.

摘要翻译： 在具有含有NOx捕获成分的催化剂层的稀薄NOx催化剂的废气净化装置中，在不会引起碱侵蚀的蜂窝状基材上形成，能够防止捕获的NOx在 时间丰富的尖峰。 在富NOx或化学计量条件下，例如三元催化剂的还原剂还原NOx的功能的NOx还原催化剂设置在贫NOx催化剂的下游。 在增加稀NOx催化剂中的NOx捕获成分的量以提高NOx捕获能力的情况下，即使在富峰期间部分捕获的NOx离解，也可以通过NOx降低解离的NOx 配置在下游侧的还原催化剂。