V-Mg-O催化剂上丁烷氧化脱氢动力学研究

制备了V－Mg-O催化剂，并测定了在该催化剂上进行丁烷氧化脱氢的反应动力学。应用BET和X射线衍射技术对催化剂进行了表征，在反应温度793－873K范围内，改变接触时间（W／F）和丁烷与氧气的分压进行了动力学实验。在所有的实验条件下，产物主要有脱氢产物（丁烯、丁二烯）、CO和CO2。提出了一个包括C4烯烃、COx生成反应的反应网络；从所测量的动力学数据中得到了合适的幂率型动力学方程。因为氧化脱氧反应的表观活化能比深度氧化反应的表观活化能大，在相同转化率时，C4烯烃选择性随着反应温度的提高而增加。

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.