Chinese Journal of Catalysis ›› 2013, Vol. 34 ›› Issue (10): 1833-1838.DOI: 10.1016/S1872-2067(12)60650-0

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Effect of supports on the structure and activity of vanadium-chromium oxide catalysts for ammoxidation of 3-picoline

Feng Jianga, Shengcai Dengb, Lei Niua, Guomin Xiaoa   

  1. a School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, Jiangsu, China;
    b Key Laboratory of Mesoscopic Chemistry of MOE, Jiangsu Provincial Key Laboratory of Nanotechnology, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, Jiangsu, China
  • Received:2013-06-07 Revised:2013-07-02 Online:2013-09-29 Published:2013-09-29
  • Contact: Guomin Xiao
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21276050) and the National Key Technology R&D Program (2012BAD32B03).

Abstract:

Bulk and Nb2O5-, MgF2-, TiO2-, and SiO2-supported vanadium-chromium oxide catalysts were prepared by the incipient wetness impregnation method and investigated for the ammoxidation of 3-picoline to nicotinonitrile at 310-400 ℃. The physical and chemical properties of the catalysts were assessed by X-ray diffraction, N2 adsorption-desorption, H2-temperature-programmed reduction, and NH3-temperature-programmed desorption. The surface area of the supports influenced the formation of the active components of the catalysts: high surface area encouraged the formation of monoclinic CrVO4 whereas low surface area favored the formation of orthorhombic CrVO4. The high reducibility of vanadium in the catalyst and the large number of surface active sites resulted in higher 3-picoline conversion efficiencies. The high selectivity was attributed to the low surface acidity of the catalysts. Reaction temperature showed a positive effect on the catalytic performance for it could increase 3-picoline conversion and maintain nicotinonitrile selectivity.

Key words: Ammoxidation, 3-Picoline, Nicotinonitrile, Support, Vanadium-chromium oxide