Catalysts, their manufacture for use in dehydrogenation reactions

Claim 1

A catalyst comprising iron oxide, chromium oxide, 5-40% by weight of kaliophyllite and excess potassium oxide with respect to said kaliophyllite, especially for dehydrogenating hydrocarbons, as obtained by the process comprising the steps of: admixing at least one iron compound, at least one chromium compound and at least one potassium compound; moistening and malaxing the resulting mixture and adding thereto at least one clayish material selected from the group consisting of kaolinite, halloisite, bentonite, montmorillonite, attapulgite and mixtures thereof, and homogenizing the mixture to form a paste; shaping said paste, drying and roasting it at a temperature of bout 870 - 1050° C, said clayish material being used in such a proportion as to obtain after said roasting a final catalyst containing 5 to 40% by weight of kaliophillite of the formula Al 2 O 3 , 2 SiO 2 , K 2 O as formed by the reaction between said clayish material and a portion of said potassium compound; the iron, chromium and potassium compounds being used in proportions corresponding as oxides, to ratios by weight: ##EQU16## and said potassium compound being used in excess with respect to the amount liable to combine with said clayish material to form said kaliophyllite, and thereby forming said catalyst.