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    Oxidizing catalyst and process for producing the same
    5.
    发明公开
    Oxidizing catalyst and process for producing the same 失效
    Oxidationskatalysator和Verfahren zur Herstellung

    公开(公告)号：EP0732145A1

    公开(公告)日：1996-09-18

    申请号：EP96104255.3

    申请日：1996-03-18

    申请人： TOYOTA JIDOSHA KABUSHIKI KAISHA ,  KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO ,  CATALER INDUSTRIAL CO., LTD.

    发明人： Yamashita, Kohichi ,  Nagami, Tetsuo ,  Sato, Akemi ,  Banno, Kouji, c/o K.K. Toyota Chuo Kenkyusho ,  Sugiura, Masahiro, K.K. Toyota Chuo Kenkyusho ,  Watanabe, Yoshihide, c/o KK Toyota Chuo Kenkyusho ,  Kumai, Yoko, c/o K.K. Toyota Chuo Kenkyusho ,  Kasahara, Koichi, c/o Cataler Industrial Co., Ltd.

    IPC分类号： B01J21/16 ,  B01D53/86 ,  B01D53/94

    CPC分类号： B01D53/944 ,  B01J21/16

    摘要： A process for producing an oxidizing catalyst includes the steps of thermally treating a double-chained-structure type clay mineral including as a constituent Mg and/or Al in a temperature range of from 400 to 800 °C to modify the double-chained-structure type clay mineral to an amorphous clay mineral at least partially having an amorphous structure, substituting a transition metal element for at least a part of the constituent Mg and/or Al of the amorphous structure in a ratio of from 0.05 to 0.80 with respect to a total number of atoms of the constituent Mg and/or Al, and loading at least one of platinum-group elements on the substituted amorphous clay mineral. Note that, when the substituted amorphous clay mineral is subjected to an acidifying step followed by a salts removing step, it is unnecessary to precisely substitute the transition metal element for the constituent Mg and/or Al in the ratio. The resulting oxidizing catalyst can oxidize and decompose HC and CO included in exhaust gases even at low temperatures, and can inhibit the sulfates production even at high temperatures so as to reduce the emission of particulate floating materials. These advantageous effects maintain even after a durability test.

    摘要翻译： 一种生产氧化催化剂的方法包括以下步骤：在400-800℃的温度范围内热处理包含作为组分Mg和/或Al的双链结构型粘土矿物，以改性双链结构 至少部分具有无定形结构的无定形粘土矿物，将过渡金属元素代替至少一部分所述无定形结构的Mg和/或Al的比例为0.05-0.80，相对于 构成Mg和/或Al的总原子数，并且在取代的无定形粘土矿物上加载至少一种铂族元素。 注意，当取代的无定形粘土矿物经过酸化步骤之后进行盐去除步骤时，不需要以比例精确地代替组分Mg和/或Al的过渡金属元素。 所得到的氧化催化剂即使在低温下也能使废气中所含的HC和CO氧化分解，并且即使在高温也能抑制硫酸盐的生成，从而减少颗粒状浮动材料的排放。 即使经过耐久性试验，这些有益效果仍然保持。