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发明公开
CN101479449A 内燃机的排气净化装置 有权

内燃机的排气净化装置
摘要：
以微小燃料液滴的形式向发动机的排气通路内添加燃料的燃料添加阀(14)、上游侧NOx吸附还原型催化剂(12)和下游侧NOx吸附还原型催化剂(13)按照所述的顺序设置。铂Pt和钯Pd一起作为贵金属载持于下游侧NOx吸附还原型催化剂(13)上，使得铂Pt的摩尔数与铂Pt和钯Pd的摩尔数总和的比率为约50％至约80％。上游侧NOx吸附还原型催化剂(12)上仅载持有铂Pt。根据该结构，即使当向排气中供给液体燃料时，NOx也能够有效地从NOx吸附还原型催化剂中释放，此外，NOx吸附还原型催化剂在低温下能够吸附的NOx的量增加。
摘要（英）：

A fuel addition valve (14) that adds fuel into the exhaust gas passage of the engine in the form of fine fuel droplets, an upstream NOx adsorption-reduction catalyst (12), and a downstream NOx adsorption-reduction catalyst (13) are arranged in this order. Platinum Pt and palladium Pd, as noble metal, are supported on the downstream NOx adsorption-reduction NOx catalyst (13) such that the ratio of the mole number of the platinum Pt to the sum of the mole numbers of the platinum Pt and the palladium Pd is approx. 50% to approx. 80%. Only platinum Pt is supported on the upstream NOx adsorption-reduction catalyst (12). According to this structure, even when liquid fuel is supplied into exhaust gas, NOx can be effectively released from the NOx adsorption-reduction catalyst, and further the amount of NOx that the NOx adsorption-reduction catalyst can adsorb at a low temperature increases.

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