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Invention Application
WO2008029263A3 EXHAUST GAS PURIFICATION APPARATUS OF NOX FOR INTERNAL COMBUSTION ENGINE 审中-公开
内燃机NOX排气净化装置

EXHAUST GAS PURIFICATION APPARATUS OF NOX FOR INTERNAL COMBUSTION ENGINE
Abstract:
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.
Abstract(Chinese):

一种燃料添加阀（14），其将燃料添加到发动机的细小燃料液滴的形式的排气通道中，上游的NOx吸附还原催化剂（12）和下游的NOx吸附还原催化剂（13） 按此顺序 作为贵金属的铂Pt和钯Pd负载在下游NOx吸附还原NOx催化剂（13）上，使得铂Pt的摩尔数与铂Pt和钯的摩尔数之和的比率 钯约为 50％〜约 80％。 在上游NOx吸附还原催化剂（12）上仅负载铂Pt。 根据该结构，即使向排气供给液体燃料，也可以从NOx吸附还原催化剂中有效地释放NOx，并且进一步降低NOx吸附还原催化剂在低温下吸附的NOx量。

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