Promoting Xylene Production in Benzene Methylation using Hierarchically Porous ZSM-5 Derived from a Modified Dry-gel Route

Wei Deng; Xuan He; Chao Zhang; Yunyi Gao; Xuedong Zhu; Kake Zhu; Qisheng Huo; Zhijie Zhou

doi:10.1016/j.cjche.2014.06.009

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Promoting Xylene Production in Benzene Methylation using Hierarchically Porous ZSM-5 Derived from a Modified Dry-gel Route

第四届整体式结构化催剂与反应器国际会议专栏 | Updated：2026-01-06

- Promoting Xylene Production in Benzene Methylation using Hierarchically Porous ZSM-5 Derived from a Modified Dry-gel Route
- Chinese Journal of Chemical Engineering Vol. 22, Issue 8, Pages: 921-929(2014)
- Affiliations：
  
  1. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University,Changchun,China,130012
  2. Key Laboratory of Coal Gasification, Ministry of Education, East China University of Science and Technology,Shanghai,China,200237
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2014.06.009
  CLC：
- Published：2014
- Accepted：
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Wei Deng, Xuan He, Chao Zhang, Yunyi Gao, Xuedong Zhu, Kake Zhu, Qisheng Huo, Zhijie Zhou. Promoting Xylene Production in Benzene Methylation using Hierarchically Porous ZSM-5 Derived from a Modified Dry-gel Route[J]. Chin.J.Chem.Eng., 2014, 22(8): 921-929.
DOI：

Wei Deng, Xuan He, Chao Zhang, Yunyi Gao, Xuedong Zhu, Kake Zhu, Qisheng Huo, Zhijie Zhou. Promoting Xylene Production in Benzene Methylation using Hierarchically Porous ZSM-5 Derived from a Modified Dry-gel Route[J]. Chin.J.Chem.Eng., 2014, 22(8): 921-929. DOI： 10.1016/j.cjche.2014.06.009.

摘要

Abstract

Methylation of benzene is an alternative low-cost route to produce xylenes

but selectivity to xylene remains low over conventional zeolitic catalysts. In this work

a combined dry-gel-conversion and steam-assistedcrystallization method is used to synthesize hierarchically porous zeolite ZSM-5 with varied Si/Al malar ratios. X-ray diffraction (XRD)

physisorption

-temperature programmed desorption (TPD)

scanning electronic microscopic (SEM) measurement and Fourier transforminfrared (FT-IR) are employed to characterize the structure and acidity of both hierarchically porous zeolites and their conventional counterparts. The method is found to be applicable to ZSM-5 with molar ratios of Si/Al from 20 to 180. The ZSM-5 zeolites are used as catalysts for benzene methylation at 460℃ to investigate the effect of additional porosity and Si/Al ratios. At low Si/Al ratios

the benzene conversions over conventional and hierarchical ZSM-5 are close

and selectivity to toluene is high over hierarchical ZSM-5. It is found that hierarchical porositymarkedly enhances the utility of zeolite and the selectivity towards xylenes via improved mass transport at higher Si/Al ratios. Un

der an optimized hierarchical ZSM-5 catalyst

xylene selectivity reaches 34.9% at a Si/Al ratio of 180.

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