Exhaust gas cleaner
    19.
    发明授权
    Exhaust gas cleaner 失效
    排气清洁剂

    公开(公告)号:US5075274A

    公开(公告)日:1991-12-24

    申请号:US493974

    申请日:1990-03-15

    摘要: An exhaust gas cleaner having a heat-resistant, porous foam-type filter as a carrier, the filter being constituted by two portions consisting of a portion having a relatively low density and a high-density, thin layer portion formed on one side of the low density portion, the low-density portion supporting a base metal catalyst consisting essentially of (a) at least one of alkali metal elements, and (b) one or more elements selected from the group consisting of transition elements (excluding platinum-group elements) and Sn, and the high-density, thin layer portion supporting a platinum-group element catalyst. The base metal catalyst may further contain at least one of rare earth elements. The exhaust gas cleaning method is conducted by using this cleaner with its low-density portion on the exhaust gas inlet or outlet side.

    摘要翻译: 一种具有耐热多孔泡沫型过滤器作为载体的排气净化器,所述过滤器由两部分组成,所述两部分由具有较低密度的部分和形成在所述多孔泡沫型过滤器的一侧上的高密度薄层部分组成 低密度部分,支持基本上由(a)至少一种碱金属元素组成的贱金属催化剂的低密度部分,和(b)一种或多种选自过渡元素(不包括铂族元素 )和Sn,以及支持铂族元素催化剂的高密度薄层部分。 贱金属催化剂还可以含有稀土元素中的至少一种。 废气净化方法是通过在排气入口或出口侧具有低密度部分的这种清洁器来进行的。