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Supported catalyst, process for its preparation and its application in the preparation of styrene

机译:负载型催化剂,其制备方法及其在苯乙烯制备中的应用

摘要

The invention relates to a carrier-supported catalyst comprising oxides of chromium and tungsten and at least one of the oxides of molybdenum and potassium in the atomic ratio of Cr1W0.1-0.5Mo0-0.05K0-0.5 on a porous carrier material, and to a process for making it. To this end, the process provides (a) for a dry porous carrier material to be saturated with water up to 40 to 80% of its predetermined saturation value; (b) for the carrier material treated as under (a) to be impregnated in any sequential order, but at least once with an aqueous solution of water-soluble compounds of chromium and, if desired, potassium, and sequentially, but at least once with a separately produced aqueous solution of a water-soluble compound of tungsten and, if desired, molybdenum, the aqueous solutions being used in either case in a quantity which is at most necessary for complete saturation; (c) for the carrier material to be dried after each impregnation over a period of 2 to 20 hours at 350 to 500 K, and (d) for the carrier material to be sintered over a period of 0.5 to 12 hours at 550 to 1000 K, in a stream of air. The carrier-supported catalyst finds use in the production of styrene by subjecting ethylbenzene to oxidative dehydrogenation with molecular oxygen in gas phase.
机译:本发明涉及在多孔载体材料上以Cr1W0.1-0.5Mo0-0.05K0-0.5的原子比包含铬和钨的氧化物以及钼和钾的氧化物中的至少一种的载体负载的催化剂,并且涉及制作过程。为此目的,该方法提供了(a)使干燥的多孔载体材料用水饱和至其预定饱和值的40%至80%; (b)按照(a)处理的载体材料以任何顺序浸渍,但至少一次用铬和水溶性钾(如果需要的话)的水溶性化合物的水溶液浸渍一次,但至少一次用单独生产的水溶性钨和钼(如果需要的话)的水溶液,在任何一种情况下,水溶液的使用量对于完全饱和是最必要的; (c)将载体材料在每次浸渍后在350至500 K的条件下干燥2至20小时,并(d)将载体材料在550至1000的条件下烧结0.5至12小时的时间。空气中的K。载体负载的催化剂可通过使乙苯在气相中与分子氧进行氧化脱氢而用于苯乙烯的生产中。

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