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Direct synthesis of Zn-incorporated nano-ZSM-5 zeolite by a dry gel conversion method for improving catalytic performance of methanol to aromatics reaction

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Abstract

A series of Zn-incorporated nano-ZSM-5 zeolites were synthesized by a dry gel conversion (DGC) method using tetrapropylammonium hydroxide (TPAOH) as a single template, and their activity in methanol to aromatics (MTA) process was investigated. The characterization results revealed that the introduction of Zn species slightly decreased the crystal size with the formation of some agglomerated particles. We also demonstrated that new Lewis acid sites formed in Zn-incorporated nano-ZSM-5 zeolite at the expense of Brønsted acid sites. The amount of medium acid sites in Zn-modified samples increased with increasing of Zn contents. Catalytic evaluation results revealed that the selectivity of BTX and aromatics for the sample synthesized via direct synthesis (Zn-NZ5-3) is increased from 24.0% and 37.9% to 27.9% and 46.4%, respectively. In addition, the lifetime of the sample prepared by the direct synthesis (Zn-NZ5-3) was 33% longer than that of the impregnated sample, while the selectivity of BTX and aromatics was slightly higher.

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Acknowledgements

This work was financially supported by the Natural Science Foundation of China (21776311), Shandong Provincial Natural Science Foundation, China (ZR2016BM28), National Key Technologies R & D Program of China, Key Projects of Intergovernmental International Innovation Cooperation (2018YFE0118200), Key Research and Development Project of Shandong province (2019JZZY010506), and National Training Program of Innovation and Entrepreneurship for Undergraduates (20190493, 202012058) .

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Authors and Affiliations

  1. State Key Laboratory of Heavy Oil Processing, College of Science, China University of Petroleum (East China), Qingdao, 266580, China

    Youhe Wang, Jingwei Xu, Zhihong Li, Shuai Guan, Yuyang Zeng, Hongman Sun, Fazle Subhan & Zifeng Yan

  2. School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, 266580, China

    Zhihong Li & Fushan Wen

  3. Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062, China

    Guofeng Zhao

  4. Department of Chemistry, Abdul Wali Khan University, Mardan, K.P.K, Pakistan

    Fazle Subhan

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  1. Youhe Wang
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Wang, Y., Xu, J., Li, Z. et al. Direct synthesis of Zn-incorporated nano-ZSM-5 zeolite by a dry gel conversion method for improving catalytic performance of methanol to aromatics reaction. J Porous Mater 28, 1609–1618 (2021). https://doi.org/10.1007/s10934-021-01120-1

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