A new catalyst, its preparation and its use for the production of maleic acid and maleic anhydride

摘要

Oxidation catalysts are obtained by treating TiO2 (preferably of anastase structure) with an aqueous solution or suspension of a vanadium complex compound and phosphomolybdic acid or its ammonium salt, thickening the mixture to a dough-like and kneadable mass, shaping preferably to bodies of 2-10 mm. diameter, drying and finally activating at 170-400 DEG C. in a current of air, preferably moist. ALSO: Maleic acid and anhydride are produced by catalytic oxidation of benzene in the vapour phase, below 400 DEG C. by use of a novel catalyst obtained by treating TiO2 (preferably of anastase structure) with an aqueous solution or suspension of a vanadium complex compound and phosphomolybdic acid or its ammonium salt, thickening the mixture to a dough-like and kneadable mass, shaping preferably to bodies of 2mm-10mm diameter, drying and finally activating at 170 DEG C.-400 DEG C. in a current of air, preferably moist.