Dealumination kinetics of composite ZSM-5/mordenite zeolite during steam treatment: An in-situ DRIFTS study

Xiaoxiao Zhang; Dangguo Cheng; Fengqiu Chen; Xiaoli Zhan

doi:10.1016/j.cjche.2017.11.009

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Dealumination kinetics of composite ZSM-5/mordenite zeolite during steam treatment: An in-situ DRIFTS study

Catalysis, Kinetics and Reaction Engineering | Updated：2026-01-06

- Dealumination kinetics of composite ZSM-5/mordenite zeolite during steam treatment: An in-situ DRIFTS study
- Chinese Journal of Chemical Engineering Vol. 26, Issue 3, Pages: 545-550(2018)
- Affiliations：
  
  Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University,Hangzhou,China,310027
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2017.11.009
  CLC：
- Published：2018
- Accepted：
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DRIFTS study[J]. Chinese Journal of Chemical Engineering, 2018, 26(3): 545-550.
DOI：

DRIFTS study[J]. Chinese Journal of Chemical Engineering, 2018, 26(3): 545-550. DOI： 10.1016/j.cjche.2017.11.009.

摘要

Abstract

To get a better understanding of structural deactivation of ZSM-5/MOR during the catalytic cracking of n-heptane in the steam atmosphere

a comprehensive mechanism of hydrothermal dealumination was proposed through in-situ diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS) in this work. The mechanism can be divided into two steps:firstly

the hydrolysis of four Al-O bonds

and secondly

the self-healing of Si-OH bonds accompanied with partial condensation of the extra-framework Al species. Accordingly

the kinetics of dealumination process has also been fully discussed. In the IR spectra

the range of 3450-3850 cm

-1

could be deconvolved to distinguish the hydroxyl groups on the different position and calculate the consumption of each hydroxyl group during the reaction. Based on results from the in-situ DRIFTS

the kinetics of dealumination was hence developed and also in well agreement with the kinetics of deactivation of ZSM/MOR catalysts during the reaction in the presence of little coke deposits.

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