Acta Phys. -Chim. Sin. ›› 2016, Vol. 32 ›› Issue (12): 2961-2967.doi: 10.3866/PKU.WHXB201609181

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Highly Selective Hydroxylation of Benzene Catalyzed by Hybrids of Polyoxometalate/Ionic Liquid

Qing MA1,2,Jin-Hui TONG1,2,*(),Ling-Di SU1,2,Wen-Hui WANG1,2,Wen-Mei MA1,2,Li-Li BO3   

  1. 1 College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, P. R. China
    2 Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education, Lanzhou 730070, P. R. China
    3 College of Science, Gansu Agricultural University, Lanzhou 730070, P. R. China
  • Received:2016-07-25 Published:2016-11-30
  • Contact: Jin-Hui TONG
  • Supported by:


Aseriesof hybridmaterials ([C4mim]3+xPMo12-xVxO40, x=0, 1, 2)basedonV-substitutedphosphomolybdic acidH3+xPMo12-xVxO40 (x=0, 1, 2) and ionic liquid 1-butyl-3-methyl imidazolium bromide ([C4mim]Br) have been prepared by an anion-exchange method. The samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectrophotometry (FT-IR) and UV-Vis diffuse reflectance spectra (UV-Vis DRS) analysis. The catalytic performances of the samples were tested in oxidation of benzene to produce phenol using H2O2 as the oxidant. The results showed that the hybrids[C4mim]3+xPMo12-xVxO40 exhibit much higher catalytic properties than both the corresponding moieties. In particular, under the optimized conditions, 21% of benzene conversion and 99%selectivity for phenol have been obtained with[C4mim]5PMo10V2O40. The sample also exhibits good reusability and was reused five times without a significant decrease in conversion and selectivity.

Key words: Polyoxometalate, Ionic liquid, Hybrid material, Hydroxylation of benzene