Insights into the vanadia catalyzed oxidative dehydrogenation of isobutane with CO2

摘要: Vanadia-based catalysts were prepared using the sol-gel method and subjected to oxidative dehydrogenation of isobutane with CO2. The materials extensively characterized by X-ray diffraction, N2 adsorption-desorption, O2-temperature programmed oxidation, temperature surface reaction, in situ Fourier transform infrared techniques. Catalytic results indicate that a high selectivity toward total C4 olefins over 85% was obtained all catalysts. On contrary, highest conversion observed 12 wt% V2O5/Ce0.6Zr0.4O2(7 wt%)-Al2O3, more stable performance achieved 6 V2O5-Ce0.6Zr0.4O2(7 wt%)-Al2O3. catalytic activity for titled reaction found be dependent on dispersion crystallinity VOx species catalyst, deposition heavier coke catalyst revealed main reason deactivation. Moreover, benefit CO2 clearly from TPSR results, confirmed follow redox mechanism.