Reduction catalyst for removal of nitrogen oxides in exhaust gas
    2.
    发明授权
    Reduction catalyst for removal of nitrogen oxides in exhaust gas 失效
    用于除去废气中氮氧化物的还原催化剂

    公开(公告)号:US4097576A

    公开(公告)日:1978-06-27

    申请号:US663833

    申请日:1976-03-04

    摘要: A reduction catalyst is disclosed. This catalyst comprises a naturally-occurring inorganic material which is a tuff consisting essentially of SiO.sub.2, Al.sub.2 O.sub.3 and H.sub.2 O containing 1-10% by weight of an alkali metal oxide and an alkaline earth metal oxide and has an X-ray diffraction pattern as shown in Table A or Table B. It is produced by depositing of the tuff metal ions selected from the group consisting of a metal belonging to Ib Group, IIb Group and VIII Group of Periodic Table, chromium, vanadium and manganese, followed by heat treatment, and repeating the same using different metal ions on each occasion. The catalyst is useful as a reduction catalyst for nitrogen oxides.

    摘要翻译: 公开了还原催化剂。 该催化剂包括天然存在的无机材料,其为基本上由SiO 2,Al 2 O 3和H 2 O组成的凝灰岩,其含有1-10重量%的碱金属氧化物和碱土金属氧化物,并具有X射线衍射图,如 表A或表B.通过沉积选自属于Ib组,IIb族和VIII族周期表的金属的凝灰岩金属离子,铬,钒和锰,然后进行热处理而制备,以及 在每种情况下重复使用不同的金属离子。 催化剂可用作氮氧化物的还原催化剂。