METHOD OF PREPARING ACTIVE PHASE OF CATALYST FOR OXIDATIVE DEHYDROGENATION OF HYDROCARBONS, CATALYST BASED ON IT, METHOD OF OBTAINING IT AND METHOD OF OXIDATIVE DEHYDROGENATING ETHANE AND ITS USE Russian patent published in 2009 - IPC C07C5/333 B01J37/04 B01J27/32 B01J23/20 B01J21/06 B01J21/04 B01J21/10 

FIELD: chemistry.

SUBSTANCE: description is given of a method of obtaining an active phase of a heterogeneous catalyst based on oxides or mixed oxides of transition metals, chosen from a group containing Mo, V, Te, Nb, through successive mixture of aqueous solutions of molybdenum tellurate, vanadium sulphate and niobium oxalate. An aqueous solution of vanadium sulphate is added to the molybdenum tellurate solution first, obtaining a suspension after mixing, which is then added to niobium oxalate. The obtained mixture is further intensively stirred for 10 minutes, kept in an autoclave at 175°C for 50 hours and after filtration and washing, roasted at 600°C in a stream of inert gas. The heterogeneous catalyst for oxidative dehydrogenation of gaseous mixtures of hydrocarbons is a composite material in form of a mechanical mixture of solid dispersion powders obtained from an active phase and an inactive phase with specific surface area of 1-10 m²/g, relative the active dispersion matrix. The method of obtaining the catalyst involves mechanical mixture of powders of active and inactive phases with subsequent pressing, crushing and grading the particles through sieving. Described also is a method of oxidative dehydrogenation of ethane, in which a gas mixture, containing oxygen and ethane in ratio ranging between 1:2.5 and 1:3.5, is fed at pressure of 1 atm and bulk speed of 500-30000 h-1 into a flow reactor with a stationary layer of the heterogeneous catalyst described above, heated to 380-420°C.

EFFECT: increased output of the dehydrogenation process, while maintaining high conversion and selectivity.

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