Study on Reaction Conditions about Oxidative Dehydrogenation of Isobutane over V-based MSU-1 Catalysts with CO_2

The catalysts were prepared by impregnation different metal oxides over MSU-1 mesoporous molecular sieves,respectively.The catalytic performance was studied in the oxidative dehydrogenation of isobutane with CO2.The results showed that the best isobutane conversion and isobutene selectivity was obtained over the catalyst of VOx/MSU-1.The temperature,the space velocity and the ratio of CO2/i-C4H10 had played a very important role in the dehydrogenation of isobutane with CO2.The optimum process was determined: reaction temperature 853 K,space velocity 7200 mL /(h·g),the ratio of CO2/i-C4H10= 3/1,the best conversion of isobutane reached 38.4% and selectivity of isobutene reached 83.2%.