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    EXHAUST GAS PURIFYING CATALYST
    3.
    发明公开
    EXHAUST GAS PURIFYING CATALYST 审中-公开
    排气净化催化剂

    公开(公告)号：EP3260189A1

    公开(公告)日：2017-12-27

    申请号：EP17184322.0

    申请日：2010-12-23

    申请人： TOYOTA JIDOSHA KABUSHIKI KAISHA ,  Cataler Corporation

    发明人： AOKI, Yuki ,  YOSHIDA, Takeru ,  SAKAGAMI, Shingo ,  KAWAI, Masaaki ,  HATANAKA, Miho ,  TANABE, Toshitaka ,  TAKAHASHI, Naoki

    IPC分类号： B01D53/94 ,  B01J23/63 ,  B01J37/02 ,  B01J23/44 ,  B01J21/06 ,  B01J27/24

    摘要： An exhaust gas purifying catalyst includes a substrate (1) that defines an exhaust gas passage; a lower catalyst layer (2) formed over the substrate, and an upper catalyst layer (3) formed over the lower catalyst layer (2). The lower catalyst layer (2) has a lower catalytic precious metal that contains at least one of Pt and Pd, and a lower-layer carrier that supports the lower catalytic precious metal. The upper catalyst layer (3) has an upper catalytic precious metal that contains Rh, and an upper-layer carrier that supports the upper catalytic precious metal. The upper-layer carrier comprises an inorganic mixed oxide that contains Ce, Zr, Al, Nd, and at least one element selected from the group consisting of rare earth elements other than Ce. The inorganic mixed oxide has interior regions containing a mixed aggregate composed of first particles comprising Ce and Zr in a form of a composite oxide, and second particles comprising Al in a form of alumina, and has cover layers containing Nd that cover surfaces of the respective interior regions. The Nd is unevenly present in the cover layers or the Nd is concentrated in the cover layers.

    摘要翻译： 一种废气净化催化剂，包括限定废气通道的基板（1） 形成在基底上的下催化剂层（2），和形成在下催化剂层（2）上的上催化剂层（3）。 下催化剂层（2）具有包含Pt和Pd中的至少一种的较低催化贵金属和负载较低催化贵金属的下层载体。 上催化剂层（3）具有含Rh的上催化贵金属和负载上催化贵金属的上层载体。 上层载体包含含有Ce，Zr，Al，Nd和选自Ce以外的稀土元素中的至少一种元素的无机混合氧化物。 所述无机混合氧化物具有内部区域，所述内部区域包含由复合氧化物形式的包含Ce和Zr的第一颗粒和包含Al的氧化铝形式的第二颗粒构成的混合聚集体，并且具有包含Nd的覆盖层，所述覆盖层覆盖各自的表面 内部区域。 Nd不均匀地存在于覆盖层中或Nd集中在覆盖层中。