Exhaust system for lean burn IC engines
    2.
    发明授权
    Exhaust system for lean burn IC engines 有权
    稀燃IC发动机排气系统

    公开(公告)号:US07178331B2

    公开(公告)日:2007-02-20

    申请号:US10526511

    申请日:2003-09-03

    IPC分类号: F01N3/10

    摘要: An exhaust system (10) for a lean-burn internal combustion engine comprises a nitrogen oxide (NOx) absorbent (28), a catalyst (30) for catalyzing the selective catalytic reduction (SCR) of a NOx with a NOx specific reactant, first means (18, 22) for introducing a NOx specific reactant or a precursor thereof into an exhaust gas upstream of the SCR catalyst (30) and means (24) for controlling the introduction of the NOx-specific reactant or precursor thereof into the exhaust gas via the first introducing means (18, 22), wherein the SCR catalyst (30) is disposed upstream of the NOx absorbent (28) and optionally with the NOx absorbent, wherein the control means (24) is arranged to introduce the NOx-specific reactant or the precursor thereof to exhaust gas via the first introducing means (18, 22) only when the SCR catalyst (30) is active, whereby exhaustion of NOx-specific reactant to atmosphere is substantially prevented.

    摘要翻译: 用于稀燃内燃机的排气系统(10)包括氮氧化物(NO x)吸收剂(28),用于催化选择性催化还原(SCR)的催化剂(30) NO x x特异性反应物的第一装置(18,22),用于将NO x x特异性反应物或其前体引入到 SCR催化剂(30)上游的废气和用于控制通过第一引入装置(18,22)将NO x - x特异性反应物或其前体引入废气的装置(24) ,其中所述SCR催化剂(30)设置在所述吸收剂(28)的上游,并且任选地设置有所述吸收剂,其中所述控制装置(24)被布置 仅当SCR催化剂(30)是活性的时,通过第一引入装置(18,22)将NO x - x特异性反应物或其前体引入排气, x -speci 基本上防止了与气氛的反应物。