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Akhmedova, Nargiz Firudin
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Chemical Engineering, Chemistry & Bioengineering Chemistry

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The Effect of Boron Concentration on the Properties and Paraselectivity of Zeolite HZSM-5 in the Methylation Reaction of Ethylbenzene Gahramanov, Taleh Ordukhan; Mammadova, Ayten Zakir; Akhmedova, Nargiz Firudin; Mamedov, Sabit Eyyub; Kerimli, Fuad Shamsaddin; Ahmadov, Eldar Isa
Bulletin of Chemical Reaction Engineering & Catalysis 2025: BCREC Volume 20 Issue 2 Year 2025 (August 2025)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20348

Abstract

In order to increase the selectivity for p-ethyltoluene, catalytic systems based on HZSM-5 zeolite modified with orthoboric acid were obtained, which were used in the alkylation of ethylbenzene with methanol. The reaction was carried out in a continuous flow reactor with a fixed catalyst bed in the temperature range of 300-400 °C at atmospheric pressure to study the effect of boron concentration in the composition of HZSM-5 on the selectivity of the formation of ethyltoluenes and p-ethyltoluene. Physicochemical and textural characteristics of the catalysts were characterized by X-ray Diffraction (XRD), Infra Red (IR) spectroscopy, NH3-Temperature Program Desorption (TPD) and low-temperature Nitrogen Adsorption (NA). It was found that the decrease in the density of strong acid sites, reduction in the volume of micropores and increase in the mesoporosity of zeolite as a result of modification are the main reasons for the enhancement of the catalyst selectivity to p-ethyltoluene. Catalyst 5 %B-HZSM-5 in the temperature range of 300 - 350 °C with conversion of ethylbenzene equal to 14.7-18.4 % shows a sufficiently high selectivity for p-ethyltoluene (60.5-70.2 %). Copyright © 2025 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Alkylation of Benzene with Ethanol over ZSM-5 Based La–P Catalysts Mamedov, Sabit Eyyub; Iskenderova, Aynur Abulfat; Mammadov, Eyyub Sabit; Akhmedova, Nargiz Firudin; Kerimli, Fuad Shamsaddin; Ismayilova, Sevda Baba
Bulletin of Chemical Reaction Engineering & Catalysis 2026: BCREC Volume 21 Issue 1 Year 2026 (April 2026)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20517

Abstract

Benzene ethylation in the presence of HZSM-5 zeolites is a promising method for producing ethylbenzene. This study examined the effects of modifying lanthanum and phosphorus as additives to the HZSM-5 catalyst, tested in the temperature range of 300-500 °C, at a benzene to ethanol molar ratio of 2:1 in a hydrogen stream. The influence of promoters on acidity and pore structure was investigated using X-ray Diffraction (XRD), NH3 Temperature Programmed Desorption (NH3-TPD), Scanning Electron Microscope (SEM), Brunauer, Emmett, and Teller (BET), and Barrett-Joyner-Halenda (BJH). Among 4%La samples, 4%P/HZSM-5 demonstrated higher ethylbenzene selectivity and operational stability associated with a decrease in the density of strong acid sites and an increase in zeolite mesoporosity because of modification. Copyright © 2026 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Co-Authors Ahmadov, Eldar Isa Gahramanov, Taleh Ordukhan Iskenderova, Aynur Abulfat Ismayilova, Sevda Baba Kerimli, Fuad Shamsaddin Mamedov, Sabit Eyyub Mammadov, Eyyub Sabit Mammadova, Ayten Zakir