Regeneration of inactive and poisoned platinum catalysts
    5.
    发明授权
    Regeneration of inactive and poisoned platinum catalysts 失效
    无活性和中毒铂催化剂的再生

    公开(公告)号:US4659683A

    公开(公告)日:1987-04-21

    申请号:US835271

    申请日:1986-03-03

    摘要: Noble metal catalyst, in particular platinum catalysts, which are applied on carriers and have become poisoned by metals as a result of being used for many years in the preparation of hydroxyl-ammonium salts by catalytic reduction of nitric oxide with hydrogen in an aqueous mineral acid are regenerated by a process in which the metallic impurities are dissolved using nitric acid or aqua regia, the solution is neutralized, the troublesome metals are precipitated from the neutralized solution by means of a selective precipitating reagent, and the purified platinum solution is reused for the preparation of the catalyst. Organic complexing agents which form insoluble or sparingly soluble complexes with the metallic impurities are preferably used as precipitating reagents.

    摘要翻译: 贵金属催化剂,特别是铂催化剂,其被应用在载体上并且由于在无机酸水溶液中用氢催化还原一氧化氮,在多年的使用中被用来制备羟基铵盐而被金属中毒 通过使用硝酸或王水溶解金属杂质的方法再生,溶液中和,通过选择性沉淀试剂从中和溶液中沉淀出麻烦的金属,并将纯化的铂溶液重新用于 制备催化剂。 与金属杂质形成不溶性或微溶性络合物的有机络合剂优选用作析出试剂。

    Catalytical process of methanol reformation
    6.
    发明授权
    Catalytical process of methanol reformation 有权
    催化甲醇改造过程

    公开(公告)号:US06521197B1

    公开(公告)日:2003-02-18

    申请号:US09616950

    申请日:2000-07-14

    IPC分类号: C01B3120

    摘要: This invention relates to an improved process of producing hydrogen and carbon dioxide by the catalytical process of methanol reformation. The improvement resides in the use of catalysts made up substantially of metal oxides selected from the group consisting of Al2O3, TiO2, ZrO2 and ZnO, and which catalyst is in the form of a substantially cylindrical tablet having a maximum diameter in the range from 0.8 to 2.0 mm and a maximum height in the range of from 0.5 to 2.0 mm.

    摘要翻译: 本发明涉及通过甲醇改性的催化方法生产氢和二氧化碳的改进方法。 改进在于使用基本上由选自Al 2 O 3,TiO 2,ZrO 2和ZnO的金属氧化物制成的催化剂,并且该催化剂是基本上为圆柱形的片剂形式,其最大直径在0.8至 2.0毫米,最大高度范围为0.5至2.0毫米。