Carrier-supported catalyst and process for making it

Details Carrier-supported catalyst and process for making it Carrier-supported catalyst and process for making it

B - Operations, Transporting

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252/100, 260/682

B01J 23/30 (2006.01) C07C 5/333 (2006.01) C07C 5/48 (2006.01) C07C 15/46 (2006.01)

Patent

CA 1131200

ABSTRACT OF THE DISCLOSURE 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 ra- tio of CR1W0.1-0.5Mo0-0.05K0-0.5 on a porous carrier mate- rial, and to a process for making it. To this end, the pro- cess provides a) for a dry porous carrier material to be saturated with water up to 40 to 80% of its predetermined saturation valve; b) for the carrier material treated as under a) to be im- pregnated 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, mo- lybdenum, 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 impregna- tion 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 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 dehydrogena- tion with molecular oxygen in gas phase.

339947

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