Ethylbenzene disproportionation and p-xylene selectivity enhancement in xylene isomerization using high crystallinity desilicated H-ZSM-5

Marjan Farshadi; Cavus Falamaki

doi:10.1016/j.cjche.2017.03.023

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Ethylbenzene disproportionation and p-xylene selectivity enhancement in xylene isomerization using high crystallinity desilicated H-ZSM-5

Catalysis, kinetics and reaction engineering | Updated：2026-01-06

- Ethylbenzene disproportionation and p-xylene selectivity enhancement in xylene isomerization using high crystallinity desilicated H-ZSM-5
- Chinese Journal of Chemical Engineering Vol. 26, Issue 1, Pages: 116-126(2018)
- Affiliations：
  
  1. 2 Chemical Engineering Department, Amirkabir University of Technology, Tehran,Iran,15875-4413
  2. 3 Petrochemical Center of Excellence, Amirkabir University of Technology, Tehran,Iran,15875-4413
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2017.03.023
  CLC：
- Published：2018
- Accepted：
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-xylene selectivity enhancement in xylene isomerization using high crystallinity desilicated H-ZSM-5[J]. Chinese Journal of Chemical Engineering, 2018, 26(1): 116-126.
DOI：

-xylene selectivity enhancement in xylene isomerization using high crystallinity desilicated H-ZSM-5[J]. Chinese Journal of Chemical Engineering, 2018, 26(1): 116-126. DOI： 10.1016/j.cjche.2017.03.023.

摘要

Abstract

Desilication accompanied with minimum loss of crystallinity effect of a high alumina ZSM-5 zeolite on the isomerization reaction of ethylbenzene/xylene mixtures has been considered. Desilication was assessed through XRF

XRD

FTIR

TEM

nitrogen adsorption/desorption

-TPD

Si and

Al MAS NMR analytical techniques. Desilication was accompanied with the creation of super acid sites. There exists a limit (Si/Al molar ratio of 9.67) for keeping high crystallinity and obtaining improved catalytic performance. Desilication promotes ethylbenzene conversion by disproportionation and trans-alkylation reactions while the same reactions are limited for the xylene isomers. The p-xylene approach to equilibrium improves by more than 7% at 400℃ and a WHSV of 2 h

-1

for the optimum sample with respect to the parent zeolite. At the same conditions

the optimum sample exhibits the maximum ethylbenzene conversion of 89%

i.e. more than 40% w.r.t. of the parent zeolite. However

the xylene yield decreases only 3%.

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