Citation: LIU Ya-cong, DONG Mei, FAN Wei-bin, QIN Zhang-feng, WANG Jian-guo. The deactivation mechanism of Zn/HZSM-5 zeolites in ethylene aromatization reaction[J]. Journal of Fuel Chemistry and Technology, ;2018, 46(7): 826-834. shu

The deactivation mechanism of Zn/HZSM-5 zeolites in ethylene aromatization reaction

1.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: DONG Mei, mdong@sxicc.ac.cn FAN Wei-bin, fanwb@sxicc.ac.cn
Received Date: 27 March 2018
Revised Date: 4 May 2018

Fund Project: Strategic Priority Research Program of the Chinese Academy of Sciences XDA21000000The project was supported by the National Key R & D Program of China (2018YFB0604802), National Natural Science Foundation of China (21573270, U1510104, 21773281) and Strategic Priority Research Program of the Chinese Academy of Sciences (XDA21000000)National Natural Science Foundation of China U1510104National Natural Science Foundation of China 21573270the National Key R & D Program of China 2018YFB0604802National Natural Science Foundation of China 21773281

Figures(9)

Zn/HZSM-5 zeolites, with zinc contents of 1%, 2%, and 3%, were prepared by impregnation method and characterized by XRD, N₂ adsorption, NH₃-TPD, Py-FTIR, XPS, and TG-DTA techniques to investigate the deactivation mechanism in ethylene aromatization reaction. It shows that coking is the main reason for catalysts deactivation, which is considerably depressed with the presence of Zn in the HZSM-5 catalysts. The deactivation is slow for the catalysts with low Zn loading. However, high content of Zn in the catalysts brings in problems such as decrease of surface area and microporous volume, and hence accelerates the deactivation. In the reaction, zinc species lose from the catalysts, accompanied with the migration and redistribution of Zn from bulk to surface of zeolite. The losing rate was constant with the time on stream, but influenced by the zinc content of the catalyst. ZnO on the external surface of the catalyst are the main species leaching from zeolite. Zn leaching is accelerated with the increase of zinc content, and has correlation with coking rate to some extent.
- Zn/HZSM-5 zeolite,
- ethylene aromatization,
- zinc content,
- Zn species,
- deactivation
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沈阳化工大学材料科学与工程学院沈阳 110142