METHOD AND APPARATUS FOR AMMONIA FORMATION IN A CATALYTIC CONVERTER
    4.
    发明申请
    METHOD AND APPARATUS FOR AMMONIA FORMATION IN A CATALYTIC CONVERTER 有权
    在催化转化器中形成氨的方法和装置

    公开(公告)号:US20100293930A1

    公开(公告)日:2010-11-25

    申请号:US12624709

    申请日:2009-11-24

    IPC分类号: F01N3/10

    摘要: An exhaust gas aftertreatment system for treating an engine-out exhaust gas feedstream of a spark-ignition direct-injection engine includes a multi-stage catalytic converter comprising a converter inlet, a converter outlet, and a substrate having a first end associated with the converter inlet and a second end associated with the converter outlet. The substrate further includes a multiplicity of flow passages between the first and second ends of the substrate, a first surface location corresponding to the first end of the substrate, and a second surface location corresponding to the second end of the substrate. A first washcoat stage is applied to the substrate at the first surface location corresponding to the first end of the substrate. A second washcoat stage is applied to the substrate at the second surface location corresponding to the second end of the substrate. The first and second washcoat stages include washcoats formulated to generate hydrogen and ammonia from the engine-out exhaust gas feedstream. An ammonia-selective catalytic reduction device is downstream of the first and second washcoat stages.

    摘要翻译: 一种用于处理火花点火直喷式发动机的发动机排气进料流的废气后处理系统包括多级催化转化器,其包括转化器入口,转换器出口和具有与转换器相关联的第一端的基板 入口和与转换器出口相关联的第二端。 衬底还包括在衬底的第一和第二端之间的多个流动通道,对应于衬底的第一端的第一表面位置和对应于衬底的第二端的第二表面位置。 在对应于衬底的第一端的第一表面位置处,将第一洗涂阶段施加到衬底。 在对应于衬底的第二端的第二表面位置处,将第二洗涂层阶段施加到衬底。 第一和第二洗涂阶段包括配制成从发动机排出的废气进料流产生氢气和氨的洗涂层。 氨选择性催化还原装置在第一和第二洗涂阶段的下游。