Chinese Journal of Applied Chemistry ›› 2019, Vol. 36 ›› Issue (5): 515-523.DOI: 10.11944/j.issn.1000-0518.2019.05.180245

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Gas Phase Dehydrochlorination of 1,1,2-Trichloroethane over Cr2O3 Catalysts

DONG Zhaoxia,SONG Tongyang,LU Jiqing,XIE Guanqun(),LUO Mengfei()   

  1. Key Laboratory of the Ministry of Education for Advanced Catalysis Materials,Institute of Physical Chemistry,Zhejiang Normal University,Jinhua,Zhejiang 321004,China
  • Received:2018-07-17 Accepted:2018-11-27 Published:2019-05-01 Online:2019-05-06
  • Contact: XIE Guanqun,LUO Mengfei
  • Supported by:
    Supported by the Natural Science Foundation of Zhejiang Province, China(No.LY16B070001)


A series of Cr2O3 catalysts was prepared by a precipitation method and tested for the gas phase dehydrochlorination of 1,1,2-trichloroethane(TCE) to synthesize cis-1,2-dichloroethylene(cis-DCE). X-ray diffraction(XRD), hydrogen temperature-programmed reduction(H2-TPR), ammonia temperature-programmed desorption(NH3-TPD) and X-ray photoelectron spectroscopy(XPS) were used to study the dehydrochlorination of TCE on Cr2O3 catalyst and its reaction mechanism. It is found that the conversion ratio of TCE on the catalysts decreases with the increase of the calcination temperature, while the selectivity to cis-DCE first increases and then decreases. The best performance is obtained on the catalyst calcined at 400 ℃, with a TCE conversion ratio of 70.8% and a cis-DCE selectivity of 90.0%. In addition, the areal specific reaction rate also first increases and then decreases with the increase of the calcination temperature, with the highest value being obtained on the catalysts calcined at 400 ℃(0.801×10-2 μmol/(s·m2). The catalytic behaviors of the catalysts are well related to their surface Cr2O3 species. Turnover frequencies(TOFs) calculated based on the surface acidity and the highest value being obtained on the catalysts calcined at 400 ℃(2.82×10-5 s-1) show that the oxidation states of the surface Cr species are important for the reaction and the Cr species with an average valence of 3.2 are appropriate for the reaction.

Key words: Cr2O3 catalysts, 1,1,2-trichloroethane, dehydrochlorination, cis-1,2-dichloroethylene, surface Cr2O3 species