Study On Ni-V-O/oxide Catalysts For Oxidative Dehydrogenation Of Propane To Propylene

The design and development of high-active and high propylene selectivity catalyst are vital for oxidative dehydrogenation (ODH) of propane to propylene. At first MgO, CaO, Al₂O₃, SiO₂, TiO₂, ZrO₂, La2O3, CeO₂were prepared and characterized. Then using these oxides as carriers, NiO/oxide, V2O5/oxide and Ni_0.9V_0.1O_Y/oxide catalysts were prepared by impregnation method and characterized with BET,XRD,H2-TPR,TEM,Electric Conductivity techniques. The effect of interaction between different oxide carriers and active components on the structure and the formation of active oxygen species of the catalysts, their influence on ODH of propane to propylene were studied. It was found that the properties of oxide carriers such as BET surface area, semiconductivity type, acid-base and redox, affect the interaction between the oxide carriers and active components. Therefore, the dispersion state of active components on the carriers, BET surface area, amount and reaction activity of active oxygen species of the obtained promoted catalysts, and their catalytic behavior for ODH of propane to propylene are different.Using ZrO₂ as carrier, the influence of loading amount of Ni_0.9V_0.1O_Y on ODH of propane was also investigated. The results showed that high loading catalysts at low reaction temperature and low loading catalysts at high reaction temperature are beneficial to propylene formation. When Ni_0.9V_0.1O_Y loading is 1%, the catalytic behavior of Ni_0.9V_0.1O_Y/ZrO2 catalyst is better.