Citation: HU Yi-Hao, SONG Tong-Yang, WANG Yue-Juan, HU Geng-Sheng, XIE Guan-Qun, LUO Meng-Fei. Gas Phase Dehydrochlorination of 1,1,2-Trichloroethane over Zn/SiO₂ Catalysts: Acidity and Deactivation[J]. Acta Physico-Chimica Sinica, ;2017, 33(5): 1017-1026. doi: 10.3866/PKU.WHXB201702082 shu

Gas Phase Dehydrochlorination of 1,1,2-Trichloroethane over Zn/SiO₂ Catalysts: Acidity and Deactivation

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

Received Date: 25 November 2016
Revised Date: 23 January 2017

Fund Project: The project was supported by the Natural Science Foundation of Zhejiang Province, China (LY16B070001).

A series of SiO₂-supported fourth period transition metal catalysts (M/SiO₂) was prepared by a wetness impregnation method for the dehydrochlorination of 1,1,2-trichloroethane (TCE) in the gas phase. Among these M/SiO₂ catalysts, Zn/SiO₂ had the best catalytic activity with the highest TCE conversion (~98%) and excellent selectivity for cis-1,2-dichloroethylene (82%). By increasing the zinc loading, the conversion of TCE using the Zn/SiO₂ catalyst was gradually improved, in agreement with the total acidity in the Zn/SiO₂ catalyst. Associating the specific activity and specific acidity of the Zn/SiO₂ catalyst with different Zn loadings, it was found that higher specific acidity contributed to higher specific activity, indicating that the acid center of Zn/SiO₂ was the catalytic active site for the dehydrochlorination of TCE. In the process of dehydrochlorination, the Zn/SiO₂ catalyst could be deactivated, mainly due to coke deposition on the catalyst surface. Catalysts with low Zn loading had stronger acid sites, which resulted in more coke formation on the catalyst. The results showed that strong acid sites on the catalyst surface were responsible for the deposition of coke and deactivation of the catalyst.
- Transition metal catalysts,
- 1,1,2-Trichloroethane,
- Cis-1,2-dichloroethylene,
- Dehydrochlorination,
- Acidity,
- Deactivation
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Gas Phase Dehydrochlorination of 1,1,2-Trichloroethane over Zn/SiO2 Catalysts: Acidity and Deactivation

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通讯作者: 陈斌, bchen63@163.com

Gas Phase Dehydrochlorination of 1,1,2-Trichloroethane over Zn/SiO₂ Catalysts: Acidity and Deactivation