Catalyst containing iron, chromium, potassium and lanthanum oxides, its

Abstract

There are described catalysts containing, as oxides, iron, chromium and potassium, the latter being optionally partly in form of kaliophyllite Al.sub.2 O.sub.3, 2 SiO.sub.2, K.sub.2 O, as well as lanthanum, in a proportion, calculated in oxide weight, of 1-15% with respect to the final catalyst. The presence in the catalyst of lanthanum oxide, optionally previously combined with cobalt or vanadium, at least in part in the form of a mixed oxide of the perovskite type, confers to the catalyst an improved activity and/or selectivity in dehydrogenation reactions, particularly of ethylbenzene to styrene.