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    • 5. 发明授权
    • Method of making catalysts for the production of ethylene oxide
    • 制备环氧乙烷生产催化剂的方法
    • US4248741A
    • 1981-02-03
    • US43414
    • 1979-05-29
    • Walter L. WernliWilliam E. FrySteve F. Janda
    • Walter L. WernliWilliam E. FrySteve F. Janda
    • B01J23/66C07D301/10B01J21/04B01J23/02B01J23/50
    • B01J23/66C07D301/10Y02P20/52
    • An improved process for preparing a silver catalyst which comprises impregnating a porous alumina support with a silver salt, preferably silver nitrate, by contacting a quantity of the support with an aqueous solution of the salt in sufficient amount to be completely absorbed by said support while under a vacuum. A dispersing agent is also employed in the aqueous silver salt solution. The support is dried by heating, e.g. 100.degree. C., under vacuum and then, while still under vacuum, impregnated with a reducing agent employing an amount sufficient to be completely absorbed by the support. Subsequent heating at a higher temperature, e.g. 250.degree. C., reduces the silver salt to silver metal. A catalyst is produced which, when employed for the oxidation of ethylene, permits the process to run 5.degree.-10.degree. C. cooler at the normal conversion and also gives an improved yield.
    • 一种改进的制备银催化剂的方法,其包括用一种银盐,优选硝酸银浸渍多孔氧化铝载体,通过使一定量的载体与该盐的水溶液充分接触,以使其完全被所述载体吸收,同时在下 一个真空。 在银盐水溶液中也使用分散剂。 载体通过加热干燥,例如 100℃,然后在仍然在真空下,用还原剂浸渍,其量足以被载体完全吸收。 随后在较高温度下加热,例如 250℃,将银盐还原成银金属。 产生一种催化剂,当用于乙烯的氧化时,催化剂允许该方法在正常转化时冷却至5〜10℃,并且还提高了产率。