DOI: https://doi.org/10.9767/bcrec.19270

Xylene Isomerization using Hierarchically Mesoporous ZSM-5

1Refining Division, Egyptian Petroleum Research Institute, 11727 Nasr City, Cairo, Egypt

2Chemistry Department, Faculty of Science, Ain Shams University, Cairo, Egypt

Received: 9 Jul 2023; Revised: 29 Aug 2023; Accepted: 30 Aug 2023; Available online: 7 Sep 2023; Published: 15 Oct 2023.
Editor(s): Istadi Istadi
Open Access Copyright (c) 2023 by Authors, Published by BCREC Group
Creative Commons License This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
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Abstract

The current study described the synthesis of H-ZSM-5 zeolites with hierarchical micro-meso- porosity (HM-ZSM-5-x) via the soft-templating route, employing organosilane surfactant, 3-[(trimethoxysilyl) propyl]octyldimethyl-ammonium chloride, as the mesoporous template. The catalytic performance was examined in the isomerization of o-xylene in a fixed-bed reactor at atmospheric pressure. Many techniques were conducted to characterize the catalysts. The X-ray diffraction (XRD) and Fourier Transform Infra Red (FTIR) results affirmed that all mesoporous zeolites possess the characteristic MFI structure, as well as good crystallinity. The N2 physisorption measurements signified that all HM-ZSM-5-x samples have higher surface areas and pore volumes than the micro-ZSM-5 sample, with the mesopores accounting for the vast majority of the total surface areas and pore volumes of HM-ZSM-5-x samples. Moreover, the mesoporosity of the obtained HM-ZSM-5-x zeolites can be simply tuned via the variation of the amount of TPOAC used. Compared with classical micro-ZSM-5, the HM-ZSM-5-0.15 sample possessed a higher o-xylene conversion and p-xylene yield that was attributed to its remarkable textural characteristics in terms of higher surface area and prevailing mesoporous character that led to a reduced diffusion limitation. Importantly, the catalyst manifested superb operational stability within 50 h, indicating high resistance against deactivation through coke deposition. Copyright © 2023 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA   License (https://creativecommons.org/licenses/by-sa/4.0).

 

Keywords: Xylene isomerization; Hierarchical mesporosity; ZSM-5, Mesoporous ZSM-5, amphiphilic organosilane, soft template
Funding: Science, Technology & Innovation Funding Authority (STDF) Egypt under contract Grant No.: 10757

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Section: Original Research Articles
Language : EN
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