FIELD: chemistry.
SUBSTANCE: invention relates to an improved catalyst for oxidation of n-butane into maleic anhydride. Method of producing promoted VPO catalyst, which contains mixed oxides of vanadium and phosphorus and is promoted with at least one of niobium, cobalt, iron, zinc, molybdenum or titanium. Method includes steps of: (i) obtaining a VPO catalyst, containing more than 80 wt% vanadyl pyrophosphate and less than 5 wt% vanadyl phosphate, (ii) bringing VPO catalyst into contact with a solution, containing compound which serves as a source of at least one metal, selected from a group consisting of niobium, cobalt, iron, zinc, molybdenum or titanium, for formation of a metal-impregnated VPO catalyst, and (iii) drying metal-impregnated VPO catalyst to form promoted VPO catalyst. Disclosed is a version of method.
EFFECT: technical result is catalyst provides high conversion of n-butane and output of maleic anhydride.
17 cl, 1 tbl, 23 ex
