Mechanical apparatus having a catalytic NOx storage and conversion device
    5.
    发明授权
    Mechanical apparatus having a catalytic NOx storage and conversion device 有权
    具有催化NOx储存和转化装置的机械装置

    公开(公告)号:US07673445B2

    公开(公告)日:2010-03-09

    申请号:US10985576

    申请日:2004-11-09

    IPC分类号: F01N3/00

    摘要: A mechanical apparatus including a combustion engine, a conduit for transporting an exhaust stream away from the engine, a first catalytic NOx storage and conversion region disposed along the conduit, and a second catalytic NOx storage and conversion region disposed along the conduit at a location downstream from the first catalytic NOx storage and conversion region is disclosed. Each of the first catalytic NOx storage and conversion region and the second catalytic NOx storage and conversion region includes at least one catalytic metal configured to convert NOx to NO2 when the engine is supplied a lean air/fuel mixture, and at least one NOx adsorbing compound configured to adsorb NO2 for storage when the engine is supplied a lean air/fuel mixture, and wherein the one of the first and the second catalytic NOx storage and conversion regions has a lower concentration of catalytic metal than the other of the first and second catalytic NOx storage and conversion regions.

    摘要翻译: 一种机械设备,包括内燃发动机,用于将排气流输送离开发动机的导管,沿导管设置的第一催化剂NOx存储和转化区,以及沿下游位置设置的第二催化剂NOx储存和转化区 公开了从第一催化剂NOx储存和转化区域。 第一催化剂NOx存储和转化区域和第二催化剂NOx储存和转化区域中的每一个包括至少一种催化金属,其被配置为当发动机供应稀薄空气/燃料混合物时将NOx转化为NO 2,并且至少一种NOx吸附化合物 被配置为当所述发动机供应贫空气/燃料混合物时吸附NO 2用于储存,并且其中所述第一和第二催化剂NOx储存和转化区域中的所述一个与所述第一和第二催化剂中的另一个具有较低的催化金属浓度 NOx储存和转化区域。