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

LIU Ya-cong; DONG Mei; FAN Wei-bin; QIN Zhang-feng; WANG Jian-guo

Volume 46 Issue 7

Jul. 2018

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Article Navigation > Journal of Fuel Chemistry and Technology > 2018 > 46(7): 826-834

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.

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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.

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

LIU Ya-cong^{1, 2},
DONG Mei^{1
,
,},
FAN Wei-bin^{1
,
,},
QIN Zhang-feng¹,
WANG Jian-guo¹

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

Funds:

the National Key R & D Program of China 2018YFB0604802

National Natural Science Foundation of China 21573270

National Natural Science Foundation of China U1510104

National Natural Science Foundation of China 21773281

Strategic Priority Research Program of the Chinese Academy of Sciences XDA21000000

More Information

Corresponding author: DONG Mei, Tel:0351-4046736, Fax:0351-4041153, E-mail:mdong@sxicc.ac.cn; FAN Wei-bin, E-mail:fanwb@sxicc.ac.cn
Received Date: 2018-03-27
Rev Recd Date: 2018-05-04

Available Online: 2021-01-23

Publish Date: 2018-07-10

Abstract

Abstract

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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References(20)

References

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