METHOD FOR COATING A CATALYSED PARTICULATE FILTER AND A PARTICULATE FILTER
    4.
    发明申请
    METHOD FOR COATING A CATALYSED PARTICULATE FILTER AND A PARTICULATE FILTER 审中-公开
    用于涂覆催化颗粒过滤器和颗粒过滤器的方法

    公开(公告)号:US20140170033A1

    公开(公告)日:2014-06-19

    申请号:US14131653

    申请日:2012-06-14

    IPC分类号: F01N3/28

    摘要: Method for the preparation of a wall flow particulate filter catalysed at its inlet side with a first catalyst having activity in the removal of residual hydrocarbons and carbon monoxide and catalysing at rich burn engine operation conditions the reaction of nitrogen oxides with hydrogen and/or carbon monoxide to ammonia and catalysed at its outlet side with a second catalyst having activity in the selective reduction of NOx by reaction with ammonia being formed in the inlet side. The method involves the provision of a first catalyst having a particle size smaller than the filter wall mean pore size, and a second catalyst having a particle size larger than the filter wall mean pore size, and mixing the first and second catalyst into one suspension, which is used for wash-coating from the outlet end. The first catalyst thereby diffuses into the partition wall.

    摘要翻译: 制备在其入口侧催化的壁流微粒过滤器的方法,该第一催化剂具有去除残余烃和一氧化碳的活性,并在富燃烧发动机运行条件下催化氮氧化物与氢气和/或一氧化碳的反应 并且在其出口侧用具有在入口侧形成的氨的反应选择性还原NOx的活性的第二催化剂催化。 该方法包括提供具有小于滤壁平均孔径的粒度的第一催化剂和具有大于过滤壁平均孔径的粒度的第二催化剂,并将第一催化剂和第二催化剂混合成一种悬浮液, 其用于从出口端进行洗涂。 第一催化剂因此扩散到分隔壁中。