Construction of hierarchical ZSM-5 molecular sieves by quaternary ammonium salt-assisted acid hydrolysis of a silicon source to enhance the catalytic pyrolysis of <italic style="font-style: italic">n</italic>-pentane

Luan Mengkun; Su Wenli; Guo Huijuan; Fan Yu

doi:10.1016/j.cjche.2025.09.040

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Construction of hierarchical ZSM-5 molecular sieves by quaternary ammonium salt-assisted acid hydrolysis of a silicon source to enhance the catalytic pyrolysis of n-pentane

Updated：2026-05-14

- Construction of hierarchical ZSM-5 molecular sieves by quaternary ammonium salt-assisted acid hydrolysis of a silicon source to enhance the catalytic pyrolysis of n-pentane
- Chinese Journal of Chemical Engineering Vol. 90, Issue 2, Pages: 86-93(2026)
- Affiliations：
  
  State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
  College of Chemistry and Life Science, Chengdu Normal University, Chengdu 611130, China
- Author bio：
  
  Corresponding author. E-mail address: fanyu@cup.edu.cn (Y. Fan).
- Funds：
- DOI：10.1016/j.cjche.2025.09.040
  CLC：
- Received：26 July 2025，
  
  Revised：2025-09-29，
  
  Accepted：29 September 2025，
  
  Online First：11 December 2025，
  
  Published：2026-02
- Accepted：
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Luan Mengkun, Su Wenli, Guo Huijuan, et al. Construction of hierarchical ZSM-5 molecular sieves by quaternary ammonium salt-assisted acid hydrolysis of a silicon source to enhance the catalytic pyrolysis of n-pentane[J]. Chinese Journal of Chemical Engineering, 2026, 90(2): 86-93. DOI: 10.1016/j.cjche.2025.09.040.
DOI：

Luan Mengkun, Su Wenli, Guo Huijuan, et al. Construction of hierarchical ZSM-5 molecular sieves by quaternary ammonium salt-assisted acid hydrolysis of a silicon source to enhance the catalytic pyrolysis of n-pentane[J]. Chinese Journal of Chemical Engineering, 2026, 90(2): 86-93. DOI: 10.1016/j.cjche.2025.09.040. DOI：

摘要

Abstract

ZSM-5 molecular sieves are potential catalysts for the catalytic pyrolysis of light naphtha. Nevertheless

traditional ZSM-5 is constrained by its low yield of light olefins and poor stability

limiting its use as a pyrolysis catalyst. In this work

a method involving quaternary ammonium salt (QAS)-assisted acid hydrolysis of silicon sources was developed to construct hierarchical and highly crystalline ZSM-5 molecular sieves for the efficient catalytic pyrolysis of

-pentane. The mesoporous sizes in hierarchical ZSM-5 were controlled by varying the

alkyl chain length of the QASs. Diffusional measurements revealed that the diffusion time constant of

-pentane increased with increasing mesoporous size inZSM-5. The

-pentane pyrolysis tests revealed that a suitable mesoporous size (10.8 nm) facilitated the

-pentane monomolecular cracking pathway while the hydrogen transfer reactions were inhibited. Among the series of ZSM-5 molecular sieves

the D-ZH5 catalyst synthesized by dodecyl trimethyl ammonium bromide (DTAB)-assisted acid hydrolysis of ethyl orthosilicate (TEOS) achieved the highest yields of light olefins (41.69% (mass) for ethylene and propylene) and the lowest deactivation rate (0.13%·h

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Construction of hierarchical ZSM-5 molecular sieves by quaternary ammonium salt-assisted acid hydrolysis of a silicon source to enhance the catalytic pyrolysis of n-pentane

DOI：10.1016/j.cjche.2025.09.040

摘要

Abstract

关键词

Keywords

references