Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (6): 1099-1109.DOI: 10.1016/S1872-2067(18)63048-7

• Articles • Previous Articles     Next Articles

Preparation and catalytic properties of mesoporous nV-MCM-41 for propane oxidative dehydrogenation in the presence of CO2

Zai-Fang Han, Xu-Liang Xue, Jian-Min Wu, Wan-Zhong Lang, Ya-Jun Guo   

  1. The Education Ministry Key Laboratory of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials, Department of Chemistry and Chemical Engineering, Shanghai Normal University, Shanghai 200234, China
  • Received:2017-12-31 Revised:2018-02-09 Online:2018-06-18 Published:2018-05-16
  • Contact: 10.1016/S1872-2067(18)63048-7
  • Supported by:

    This work was supported by the Ministry of Education of China (PCSIRT_IRT_16R49) and the International Joint Laboratory on Resource Chemistry (IJLRC).

Abstract:

The nV-MCM-41 catalysts were prepared by one-step hydrothermal synthesis and applied to the oxidative dehydrogenation of propane (ODHP) in the presence of CO2. Several state-of-the-art characterization methods were performed to explore the correlation between catalytic performance and the physicochemical characterizations of the catalysts. Because moderate amounts of V species were introduced into the framework of MCM-41, the catalyst maintained a large specific surface area, a highly ordered mesoporous structure, and highly dispersed V active sites (monomeric and dimeric V oxide species), while the high-vanadium-doping catalysts caused an enhancement in the number of acidic sites and V2O5 crystallites. The ODHP reaction showed that the 6.8V-MCM-41 (V content 6.8 wt%) catalyst exhibits high activity and stability, and the C3H8/CO2 molar ratio (1:4) was suitable. The promoting effect of CO2on the oxidative dehydrogenation of ODHP was demonstrated as the reaction coupling mechanism and "lattice oxygen" mechanism.

Key words: Propane dehydrogenation, Vanadium oxide, MCM-41, Mesoporous support, Heterogeneous catalysis