Catalytic Properties of Different Crystal Sizes for ZSM-5 Zeolites on the Alkylation of Benzene with Methanol and Optimization of the Reaction Conditions

Acta Phys Chim Sin >> 2016,Vol.32>> Issue(7)>> 1775-1784 doi: 10.3866/PKU.WHXB201604141 中文摘要

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YUAN Ping^1,2, WANG Hao¹, XUE Yan-Feng^1,2, LI Yan-Chun^1,2, WANG Kai^1,2, DONG Mei¹, FAN Wei-Bin¹, QIN Zhang-Feng¹, WANG Jian-Guo¹
1 State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China;
2 University of Chinese Academy of Sciences, Beijing 100049, P. R. China

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The hydrothermal synthesis method is used to prepare various crystal sizes of ZSM-5, and the effect of the crystal size on the alkylation of benzene with methanol is systematically investigated. The research results show that the conversion of benzene, selectivity of xylene, and the stability of the catalyst all decrease significantly with increasing crystal size. The ZSM-5 zeolite with a crystal size of 0.25 μm possesses the best catalytic performance and stability compared with other larger-sized zeolites. In addition, the deposition species and deactivation mechanism were also studied by Raman spectroscopy and thermogravimetric analysis. The results indicate that the catalyst deactivation may be attributed to the formation of polycyclic aromatic molecules, which can block the channel of the zeolite and cover the active sites. Finally, the effects of the reaction temperature, ratio of benzene to methanol, and space velocity on the alkylation of benzene with methanol are also investigated, and the optimum reaction conditions are determined.

Keywords: Benzene alkylation ZSM-5molecular sieve Variation of crystal size Deactivationmechanism
Received: 2016-02-02 Accepted: 2016-04-12 Publication Date (Web): 2016-04-14
Corresponding Authors: WANG Hao Email: wanghao@sxicc.ac.cn

Fund: The project was supported by the National Natural Science Foundation of China (General Program) (21273263, 21273264) and Scholarship Council of Shanxi Province, China (2014-102).

Cite this article: YUAN Ping, WANG Hao, XUE Yan-Feng, LI Yan-Chun, WANG Kai, DONG Mei, FAN Wei-Bin, QIN Zhang-Feng, WANG Jian-Guo. Catalytic Properties of Different Crystal Sizes for ZSM-5 Zeolites on the Alkylation of Benzene with Methanol and Optimization of the Reaction Conditions[J]. Acta Phys. -Chim. Sin., 2016,32 (7): 1775-1784. doi: 10.3866/PKU.WHXB201604141

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