COMPOSITION A BASE D'UN OXYDE DE STRUCTURE SPINELLE, SON APPLICATION COMME CATALYSEUR ET PROCEDE POUR L'OBTENIR

摘要

A composition which comprises an oxide of spinel structure of the gamma Fe2O3-Fe3O4 type substituted by trivalent and monovalent metals or doped using their derivatives not forming part of the spinel structure. …The invention relates more particularly to an iron, aluminium and potassium oxide and its use as a catalyst for dehydrogenation of ethylbenzene to styrene. This composition is prepared by thermal decomposition of mixed iron, aluminium and potassium oxalates in the presence of air, followed by a reduction in the presence of steam and hydrogen at a temperature below 400 DEG C, followed by an oxidation. …The invention also relates to the preparation of oxides of beta alumina structure.