Chinese Journal of Catalysis ›› 2013, Vol. 34 ›› Issue (6): 1201-1207.DOI: 10.1016/S1872-2067(12)60595-6

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Effect of H2S pre-treatment on structure and activity of Ni2P/SiO2 catalyst for hydrodechlorination of chlorobenzene

YANG Qinga, DAI Jicaib, LI Keluna, CHEN Jixianga   

  1. a Department of Catalysis Science and Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
    b Hebei Botou Vocational College, Botou 062150, Hebei, China
  • Received:2012-12-27 Revised:2013-04-02 Online:2013-06-07 Published:2013-06-09
  • Supported by:

    This work was supported by the Natural Science Foundation of Tianjin (12JCYBJC13200).

Abstract:

The effect of 10% H2S/H2 treatment on the structure of Ni2P/SiO2 and its activity for the hydrodechlorination of chlorobenzene was investigated using X-ray diffraction, inductively coupled plasma atomic emission spectroscopy, X-ray photoelectron spectroscopy, CO chemisorption, H2 temperature-programmed desorption, NH3 temperature-programmed desorption, and activity tests. The H2S/H2 treatment did not change the Ni2P phase or crystallite size even at temperatures as high as 873 K. However, S species were incorporated in the surface of the Ni2P crystallites to form surface phosphosulfide (NiPxSy) species, which blocked the Ni sites and induced their further electron-deficiency. H2S/H2 treatment also led to an increase of spilt-over hydrogen species. The treated Ni2P/SiO2 catalyst had higher turnover frequencies in the hydrodechlorination of chlorobenzene than the untreated catalyst. This was ascribed to the increased electron-deficiency of Ni site and a greater amount of spilt-over hydrogen species.

Key words: Nickel phosphide, Hydrogen sulfide, Electron structure, Spilt-over hydrogen, Chlorobenzene, Hydrodechlorination