Citation: DONG Zhaoxia, SONG Tongyang, LU Jiqing, XIE Guanqun, LUO Mengfei. Gas Phase Dehydrochlorination of 1, 1, 2-Trichloroethane over Cr₂O₃ Catalysts[J]. Chinese Journal of Applied Chemistry, ;2019, 36(5): 515-523. doi: 10.11944/j.issn.1000-0518.2019.05.180245 shu

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

Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, Zhejiang 321004, China

Corresponding author: XIE Guanqun, gqxie@zjnu.cn LUO Mengfei, mengfeiluo@zjnu.cn
Received Date: 17 July 2018
Revised Date: 12 October 2018
Accepted Date: 27 November 2018

Fund Project: the Natural Science Foundation of Zhejiang Province, China LY16B070001Supported by the Natural Science Foundation of Zhejiang Province, China(No.LY16B070001)

Figures(6)

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.
- Cr₂O₃ catalysts,
- 1, 1, 2-trichloroethane,
- dehydrochlorination,
- cis-1, 2-dichloroethylene,
- surface Cr₂O₃ species
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Gas Phase Dehydrochlorination of 1, 1, 2-Trichloroethane over Cr2O3 Catalysts

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