Synthesis of a MoVNbTe shell catalyst for oxidative dehydrogenation of ethane to ethylene

The invention relates to a shell catalyst, which has, in the outer shell, a mixed oxide material, comprising the elements molybdenum, vanadium, niobium and tellurium, characterised in that the shell catalyst has a BET surface area of > 30 m2/g. The catalyst according to the invention is produced by a method comprising the following steps: a) producing a mixture of starting compounds, which mixturecontains molybdenum, vanadium, niobium and a tellurium-containing starting compound, in which tellurium is present in the oxidation state +4, as well as oxalic acid and at least one further oxo ligand; b) hydrothermally treating the mixture of starting compounds at a temperature of 100 to 300 DEG C to obtain a product suspension; c) separating and drying the mixed oxide material contained in theproduct suspension resulting from step b); d) optionally calcining the mixed oxide material obtained in step c) under inert gas at 300 to 450 DEG C, e) creating a coating suspension that contains themixed oxide material from s