Catalyst, process for its production and its use for preparing vinyl acetate
    4.
    发明授权
    Catalyst, process for its production and its use for preparing vinyl acetate 失效
    催化剂,其生产方法及其用于制备乙酸乙烯酯的方法

    公开(公告)号:US06268522B1

    公开(公告)日:2001-07-31

    申请号:US09089627

    申请日:1998-06-03

    IPC分类号: C07C6705

    摘要: The invention relates to a process for producing supported shell catalysts comprising noble metals by UV photoreduction of noble metal salt precursors fixed to a support. For this purpose, the shaped supported body is impregnated with suitable noble metal salts which are then reduced to the metals in a zone close to the surface by means of UV radiation, preferably in the absence of a chemical reducing agent. The metal salts in the interior of the pellets which have not been irradiated and therefore have not been reduced are extracted using a solvent. The noble metal shell catalysts produced in this way can be used for many heterogeneously catalyzed reactions such as hydrogenations and oxidations. According to the invention, Pd/Au shell catalysts on porous ceramic supports, e.g. SiO2 shaped bodies, produced by this process can be used in the synthesis of vinyl acetate.

    摘要翻译: 本发明涉及通过紫外光还原固定在载体上的贵金属盐前体制备包含贵金属的负载型壳催化剂的方法。 为此,成形的支撑体浸渍有合适的贵金属盐,然后通过UV辐射将其还原成靠近表面的区域中的金属,优选在不存在化学还原剂的情况下。 使用溶剂提取未被照射并因此未被还原的颗粒内部的金属盐。以这种方式制备的贵金属壳催化剂可用于许多非均相催化反应如氢化和氧化。根据 对于本发明,Pd / Au壳催化剂在多孔陶瓷载体上,例如 通过该方法生产的SiO 2形体可用于乙酸乙烯酯的合成。