Chinese Journal of Applied Chemistry

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Selective Nitration of Phenols via H6PMo9V3O40/SiO2 catalysts

WU Jinming1, SHI Lei1, SHEN Aibao1*, TANG Yanfeng1, LU Tianhong2,3   

  1. (1.School of Chemistry and Chemical Engineering,Nantong University,Nantong 226019,China;
    2.Jiangsu Key Laboratory of New Power Batteries,School of Chemistry and
    Material Science,Nanjing Normal University,Nanjing 210097,China;
    3.Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 226019,China)
  • Received:2013-05-22 Revised:2013-08-05 Published:2014-04-10 Online:2014-04-10
  • Contact: shen aibao

Abstract: To establish a clean and efficient nitration process of phenolic compounds, heteropolyacid H6PMo9V3O40(PMAV3) and chromatographic silica gel were respectively chosen as active component and carrier for the preparation of a series of supported catalysts(PMAV3/SiO2) via the conventional impregnation method. The catalysts were characterized by Fourier transform infrared spectroscopy(FTIR), X-ray diffraction(XRD),N2 adsorption-desorption and thermogravimetry-differential scanning calorimetry(TG-DSC). The catalytic performance of catalysts was evaluated for the nitration of phenols. The results reveals that PMAV3/SiO2 exhibits excellent catalytic activity and regioselectivity for the nitration of phenols, the nitration yield is in the range of 83.7%~94.5%. For salicylic acid, the para-selectivity is nearly 100%, but for phenol, 2-methylphenol, 2-chlorophenol and 2-fluorphenol, the ortho-selectivity is observed. The textural properties of PMAV3/SiO2 are close to that of PMAV3, but BET of the supported catalysts is decreased with the rise of PMAV3 loading. PMAV3/SiO2 shows better thermal stability than PMAV3. The catalyst can be recovered easily and reused for five times without noticeable drop in activity.

Key words: catalyst, heteropolyacid, H6PMo9V3O40, silica gel, nitration, phenolic compound

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