METHOD OF PRODUCING SELECTIVE-DEHYDROGENATION CATALYSTS, AND CATALYSTS PRODUCED IN THIS WAY

摘要

PCT No. PCT/EP96/04028 Sec. 371 Date Mar. 17, 1998 Sec. 102(e) Date Mar. 17, 1998 PCT Filed Sep. 13, 1996 PCT Pub. No. WO97/10898 PCT Pub. Date Mar. 27, 1997Catalysts comprising iron and potassium and, if desired, further elements, which catalysts are suitable for dehydrogenating hydrocarbons to give the corresponding olefinically unsaturated hydrocarbons, are prepared by calcining a finely divided dry or aqueous mixture of an iron compound with a potassium compound and, if desired, compounds of further elements in a first step that agglomerates having a diameter of from 5 to 50 mu m and formed from smaller individual particles are obtained and, in a second step, preferably after shaping, calcining it at from 300 to 1000 DEG C., with the maximum calcination temperature in the second step preferably being at least 30 DEG below the calcination temperature in the first step. The catalysts thus prepared are useful, in particular, for dehydrogenating ethylbenzene to give styrene.