Molybdenum-vanadium bimetallic oxide catalyst and its application in chemical looping oxidative dehydrogenation of alkane

A method of chemical looping oxidative dehydrogenation of a light alkane over a molybdenum-vanadium bimetal oxide catalyst, comprising:

• uniformly mixing a molybdenum-vanadium bimetal oxide catalyst with quartz sand in a reactor, wherein, the molybdenum-vanadium bimetal oxide catalyst comprises:
• a solid solution composed of an oxide of molybdenum (Mo) and an oxide of vanadium (V), a molar ratio of Mo and V in the molybdenum-vanadium bimetal oxide catalyst is 1-(4-30), and Mo enters bulk phase lattice of V2O5, resulting in a lattice distortion of V2O5 and forming the solid solution, and a mass ratio of the molybdenum-vanadium bimetal oxide catalyst to the quartz sand is (0.2-1):1;
• introducing nitrogen to the reactor to remove oxygen and air, and then introducing a light alkane to the reactor, wherein, the light alkane is an alkane selected from the group consisting of ethane, propane, n-butane and iso-butane, a total flow of the light alkane and nitrogen is 20 ml/min-50 ml/min, and a volume percent of the light alkane to a total volume of the light alkane and the nitrogen is 10%-30%;
• and
• contacting the light alkane with the molybdenum-vanadium bimetal oxide catalyst at atmospheric pressure and a temperature from 450° C.-500° C. to produce a product comprising an alkene.