Synthesis of a MoVNbTe coated catalyst for the oxidative dehydrogenation of ethane to ethylene

摘要

The invention relates to a shell catalyst having in the outer shell a mixed oxide material comprising the elements molybdenum, vanadium, niobium and tellurium, characterized in that the shell catalyst has a BET surface area of 30 m / g. The catalyst according to the invention is prepared by a process comprising the steps of: a) preparing a mixture of starting compounds comprising molybdenum, vanadium, niobium and a tellurium-containing starting compound in which tellurium is in the +4 oxidation state, and oxalic acid and at least one further oxo ligand b) hydrothermal treatment of the mixture of starting compounds at a temperature of 100 to 300 ° C to obtain a product suspension, c) separation and drying of the mixed oxide material contained in the product suspension resulting from step b) D) optionally calcining the e) preparing a coating suspension containing the mixed oxide material from step d) with the addition of organic and / or inorganic binders, f) coating an inert catalyst support with the coating suspension Step e) by spraying the Beschi suspension suspension in a moving bed of the inert catalyst support, and optionally g) calcining the catalyst particles from step f) at a temperature of 80 to 400 ° C.