Chinese Journal of Catalysis ›› 2014, Vol. 35 ›› Issue (8): 1329-1336.DOI: 10.1016/S1872-2067(14)60180-7

• Articles • Previous Articles     Next Articles

Insights into the vanadia catalyzed oxidative dehydrogenation of isobutane with CO2

Ruixue Yuana, Yang Lib, Haobing Yana, Huan Wanga, Jian Songc, Zhongshen Zhangb, Weibin Fanc, Jiangang Chena, Zhongwen Liua, Zhaotie Liua, Zhengping Haob   

  1. a. Key Laboratory of Applied Surface and Colloid Chemistry, School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi'an 710062, Shaanxi, China;
    b. Department of Environmental Nano-materials, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;
    c. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, Shanxi, China
  • Received:2014-06-21 Revised:2014-06-26 Online:2014-08-01 Published:2014-08-05
  • Supported by:

    This work was supported by the National Basic Research Program of China (973 Program, 2010CB732300) and the National Natural Science Foundation of China (21376146, 21306111, 21337003).

Abstract:

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

Key words: Isobutane, Oxidative dehydrogenation, Carbon dioxide, Vanadia, Alumina