Kinetic study of the oxidative dehydrogenation of butane over V-Mg-O catalyst

V-Mg-O catalyst was prepared. The reaction kinetics of the oxidative dehydrogenation of butane over V-Mg-O catalyst was investigated. The catalyst was characterized by BET and X-ray diffraction. The kinetic tests were carried out between 793-873 K by changing the contact time (W/F) and the partial pressure of both butane and oxygen. Under all experiment conditions, the main products were dehydrogenation products (butene and butadiene), CO and CO₂. A reaction network including the formation of C₄ olefins and carbon oxides was proposed. The suitable power law kinetic equations were obtained from the kinetic measurements. Since the apparent activation energies of oxydehydrogenation reactions are higher than that of deep oxidation reaction of C₄ olefins, the selectivity to C₄ olefins increases with the reaction temperature when the conversion is the same.