Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (11): 2659-2664.doi: 10.3866/PKU.WHXB20111108

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Selective Oxidation Performance of Propane over Supported Vanadium Oxide Catalysts

LIU Jian, ZHAO Zhen, WANG Hong-Xuan, DUAN Ai-Jun, JIANG Gui-Yuan   

  1. State Key Laboratory of Heavy Oil, China University of Petroleum, Beijing 102249, P. R. China
  • Received:2011-06-07 Revised:2011-08-08 Published:2011-10-27
  • Contact: ZHAO Zhen
  • Supported by:

    The project was supported by the New Century Excellent Talents in University of China (NCET-10-0811), Doctor Select Foundation of China University (200804251016), National Natural Science Foundation of China (20803093, 20833011), National High-Tech Research and Development Program of China (863) (2009AA06Z313), and CNPC Project and Innovation Foundation (2010D-4604-0402).

Abstract: A series of SBA-15 supported vanadium oxide catalysts with different active components were prepared by the method of incipient-wet impregnation. The structures of the catalysts were characterized by N2 adsorption, X-ray diffraction (XRD), ultraviolet (UV)-Raman, Fourier transform infrared (FTIR), and ultraviolet-visble diffuse reflectance spectroscopy (UV-Vis DRS) techniques, and their catalytic performances for the selective oxidation of propane were investigated. The results showed that SBA-15 was a better support in the catalyst system than SiO2 for the selective oxidation of propane to aldehydes. The SBA-15 supported low loading catalyst is a highly dispersed catalyst system and the SBA-15 supported vanadium oxide samples with low loading (n(V)/n(Si)<2.5%) have ordered hexagonal mesostructures. For the VOx/SBA-15 catalysts, isolated vanadyl species with tetrahedral coordination are the active sites for aldehyde formation at very low loadings of vanadium (n(V)/n(Si)<0.1%). The polymeric vanadyl species with octahedral coordination and microcrystalline vanadium oxide are active sites for the oxidative dehydrogenation or deep oxidation of propane when the loading of vanadium (n(V)/n(Si)) is higher than 2.5%.

Key words: Selective oxidation of propane, Catalyst, SBA-15 mesoporous molecular sieve, Supported vanadium oxide, Characterization