FIELD: chemistry.
SUBSTANCE: present invention relates to mixed metal oxide oxidation catalysts and ammonolysis of propane and isobutane, methods of obtaining them and usage. Described is a mixed metal-oxide system, containing molybdenum, vanadium, niobium, antimony, germanium and oxygen or molybdenum, vanadium, tantalum, antimony, germanium and oxygen, with the following stoichiometric ratios of elements: molybdenum to antimony from 1:0.1 to approximately 1:0.5, and molybdenum to germanium from 1:>0.2 to approximately 1:1. Description is given of a catalyst, which is a mixed metal-oxide system, effective in vapour-phase conversion of propane to acrylic acid or acrylonitrile or conversion of isobutane to methacrylic acid or methacrylonitrile. The mixed metal-oxide system has an empirical formula Mo1VaNbbSbcGedOx or Mo1VaTabSbcGedOx, in which a ranges between 0.1 and 0.6, b ranges between 0.02 and 0.12, c ranges between 0.1 and 0.5, d ranges from more than 0.2 to 1, and x depends on the oxidation number of other elements in the mixed metal-oxide system. Described also is a method of obtaining the system described above, involving the following stages: addition into a reaction vessel of precursors Mo, V, Nb or Ta, Ge and Sb in an aqueous solvent to form a reaction medium with initial pH 4 or less, and optional addition of another aqueous solvent into the reaction vessel; sealing the reaction vessel; reaction of the reaction mixture at temperature above 100°C and pressure above atmospheric pressure for a period of time, sufficient for formation of a mixed metal-oxide system; optional cooling of the reaction mixture; and extraction of the mixed metal-oxide system from the reaction mixture. Description is given of a method of converting propane into acrylonitrile and isobutane into methacrylonitrile using the catalyst described above.
EFFECT: simple technology of making catalyst, increased catalyst activity and output of the target product in reactions of oxidative ammonolysis of propane and isobutane.
27 cl, 8 tbl, 50 ex, 1 dwg
