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A kinetic study on methylation of naphthalene over Fe/ZSM-5 zeolite catalysts

Güleç, Fatih; Özen, Aysun; Niftaliyeva, Aysel; Aydın, Ayşe; Şimşek, Emir Hüseyin; Karaduman, Ali

Authors

DR FATIH GULEC FATIH.GULEC1@NOTTINGHAM.AC.UK
Assistant Professor in Chemical and Environmental Engineering

Aysun Özen

Aysel Niftaliyeva

Ayşe Aydın

Emir Hüseyin Şimşek

Ali Karaduman



Abstract

2,6-Dimethylnaphthalene is an important dimethylnaphthalene isomer which can be used in the production of polyethylene naphthalate. The novelty of this study is to reveal Langmuir–Hinshelwood and Eley–Rideal reaction rate equations for the methylation of naphthalene over Fe/ZSM-5 zeolite catalysts besides the proposed reaction rate equation. To investigate the kinetics and mechanisms of naphthalene methylation, the methylation experiments were carried out in a gas–solid catalytic fixed-bed reactor in the presence of Fe/ZSM-5 zeolite catalysts at two different temperatures (450 and 500°C) and five different weight hourly space velocities (0.5, 1.0, 1.5, 2.0, 2.5, 3.0h−1). A naphthalene:methanol:1,2,4-trimethyl benzene mixture having a 1:3:10 molar ratio was used as a feed stream. The methylation products were identified by using GC–MS. For the methylation kinetics of naphthalene, the reaction rates depending on the naphthalene and methanol concentration were determined. Furthermore, the effects of temperature and weight hourly space velocity on the conversion of naphthalene, the selectivity of 2,6-dimethylnaphthalene, and the ratio of 2-methylnaphthalene/1-methylnaphthalene were determined. The results of this study demonstrate that the Langmuir–Hinshelwood reaction mechanism for naphthalene methylation is more compatible at 450°C and the Eley–Rideal reaction mechanism at 500°C. Moreover, in addition to 2,6-dimethylnaphthalene, other dimethylnaphthalene and tri-methylnaphthalene isomers were formed in the methylation of naphthalene. The conversion of naphthalene reached approximately 70%. Moreover, the highest selectivity of 2,6-dimethylnaphthalene was almost 40%. The ratios of 2-methylnaphthalene/1-methylnaphalene demonstrate that the methylation of naphthalene to 2-methynaphthalene is much higher than to 1-methynaphthalene.

Citation

Güleç, F., Özen, A., Niftaliyeva, A., Aydın, A., Şimşek, E. H., & Karaduman, A. (2018). A kinetic study on methylation of naphthalene over Fe/ZSM-5 zeolite catalysts. Research on Chemical Intermediates, 44(1), 55-67. https://doi.org/10.1007/s11164-017-3090-5

Journal Article Type Article
Acceptance Date Jul 21, 2017
Online Publication Date Aug 2, 2017
Publication Date 2018-01
Deposit Date Jun 22, 2023
Journal Research on Chemical Intermediates
Print ISSN 0922-6168
Electronic ISSN 1568-5675
Publisher Springer Verlag
Peer Reviewed Peer Reviewed
Volume 44
Issue 1
Pages 55-67
DOI https://doi.org/10.1007/s11164-017-3090-5
Keywords General Chemistry
Public URL https://nottingham-repository.worktribe.com/output/22182813