Catalyst for reducing the nitrogen oxide concentration in a flowing
medium and method for producing the catalyst
    1.
    发明授权
    Catalyst for reducing the nitrogen oxide concentration in a flowing medium and method for producing the catalyst 失效
    用于降低流动介质中的氮氧化物浓度的催化剂及其制造方法

    公开(公告)号:US6054408A

    公开(公告)日:2000-04-25

    申请号:US764712

    申请日:1996-12-02

    CPC分类号: B01D53/8628 B01J23/28

    摘要: An SCR catalyst containing titanium, molybdenum and vanadium has the particular characteristic that its catalytic activity is significantly less than that of a tungsten-containing catalyst. That disadvantage has been compensated for in the past by using a comparatively large volume of catalyst. In contrast to the conventional practice of using a molybdenum oxide proportion of about 10 to 12% by weight, the invention proposes that the molybdenum proportion of the catalyst, in the form of molybdenum trioxide MoO.sub.3, is about 0.01 to 5% by weight, preferably 1.5 to 4% by weight, relative to the weight of the catalyst mass. A catalyst containing this amount of molybdenum thus has an activity comparable to that of a tungsten-containing catalyst. The invention is applicable to all deNO.sub.x catalytic converters which call for the simultaneous presence of a reducing agent, in particular plate-type and honeycomb-type catalytic converters.

    摘要翻译: 含有钛,钼和钒的SCR催化剂具有特别的特征,即其催化活性显着小于含钨催化剂的催化活性。 该缺点已经通过使用较大体积的催化剂得到补偿。 与使用约10至12重量%的氧化钼比例的常规实践相反,本发明提出以三氧化钼MoO 3的形式的催化剂的钼比例为约0.01至5重量%,优选为 相对于催化剂质量的重量为1.5至4重量%。 因此,含有该量的钼的催化剂具有与含钨催化剂相当的活性。 本发明适用于需要同时存在还原剂的所有脱硝催化转化器,特别是板式和蜂窝型催化转化器。

    Arsenic-resistant mixed oxide catalyst and process for producing the same
    2.
    发明授权
    Arsenic-resistant mixed oxide catalyst and process for producing the same 失效
    耐摩擦混合氧化物催化剂及其制造方法

    公开(公告)号:US5112794A

    公开(公告)日:1992-05-12

    申请号:US541714

    申请日:1990-06-21

    IPC分类号: B01D53/86 B01J23/00 B01J23/28

    摘要: In an arsenic resistant mixed oxide catalyst and a process for producing the same, oxides of at least the metals vanadium and molybdenum are provided, especially for reducing nitrogen oxides in flue gases in the presence of a reducing agent such as ammonia and carbon monoxide. A MoO.sub.3 phase and at least one oxygen-rich mixed oxide phase such as V.sub.9 Mo.sub.6 O.sub.40 is at least partly converted into a mixed oxide phase being poorer in oxygen such as a V.sub.9 Mo.sub.4 O.sub.25 phase, for increasing arsenic resistance.

    摘要翻译: 在耐砷混合氧化物催化剂及其制造方法中,提供至少金属钒和钼的氧化物,特别是在还原剂如氨和一氧化碳存在下还原烟道气中的氮氧化物。 MoO 3相和至少一种富氧混合氧化物相如V9Mo6O40至少部分地转化为在氧中较差的混合氧化物相,例如V9Mo4O25相,用于增加耐砷性。