Increasing the catalytic stability of microporous Zn/ZSM-5 with copper for enhanced propane aromatization

Catalytic transformation of light alkanes to aromatic compounds which are feedstocks to petrochemical industries is an important process. Here, a simple method of co-impregnation was employed to synthesize Zn-Cu/ZSM-5 for propane aromatization. Copper of varying loading 1–3 wt% was co-impregnated wi...

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Autores principales:	G.G. Oseke, A.Y. Atta, B. Mukhtar, B.J. El-Yakubu, B.O. Aderemi
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Propane aromatization Bimetallic Co-impregnation Zinc/ZSM-5 Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/981ca404b59c4875a5ceeeb5053483af
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spelling	oai:doaj.org-article:981ca404b59c4875a5ceeeb5053483af2021-11-22T04:18:25ZIncreasing the catalytic stability of microporous Zn/ZSM-5 with copper for enhanced propane aromatization1018-363910.1016/j.jksues.2020.07.014https://doaj.org/article/981ca404b59c4875a5ceeeb5053483af2021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1018363920302786https://doaj.org/toc/1018-3639Catalytic transformation of light alkanes to aromatic compounds which are feedstocks to petrochemical industries is an important process. Here, a simple method of co-impregnation was employed to synthesize Zn-Cu/ZSM-5 for propane aromatization. Copper of varying loading 1–3 wt% was co-impregnated with zinc to improve zinc stability at the reaction condition. Catalyst physicochemical properties were analyzed using XRD, BET, N2-adsorption, FTIR, FTIR-Pyridine, SEM, TEM, H2-TPR and XPS. The XRD and FTIR characterization showed that the modified catalysts retained their crystallinity after metal impregnation with the XPS confirming the metal species having oxidation state of 2+. Hydrogen-TPR and XPS change in reduction temperature and binding energy spectra showed stronger intermetallic interaction respectively. Incorporation of Cu with Zn on ZSM-5 reduced Bronsted acidity from the FTIR-Pyridine while N2-adsorption isotherms verified the catalyst are microporous. The performance tests for propane aromatization over synthesized catalysts were carried out in a fixed bed reactor using GHSV of 1200 ml/g-h at 540 °C and atmospheric pressure. Co-impregnation of Zn with Cu improved the catalytic activity and sustained aromatic selectivity at an average of 85% for 12 h’ time on stream as compared to HZSM-5 (10%) and Zn/ZSM-5 (50%). Product distribution showed reduced light hydrocarbon formation and increased aromatic compounds with high selectivity towards toluene, m and o-xylene among the aromatic product distribution. The best aromatic selectivity product distribution was recorded for 2 wt% Cu with Zn, thus a more stable catalyst developed. XPS and H2-TPR analysis showed that the synergistic interaction between the two metals (Cu and Zn) improved the performance of bimetallic Zn-Cu/ZSM-5 catalyst by promoting zinc dispersion and stability during reaction.G.G. OsekeA.Y. AttaB. MukhtarB.J. El-YakubuB.O. AderemiElsevierarticlePropane aromatizationBimetallicCo-impregnationZinc/ZSM-5Engineering (General). Civil engineering (General)TA1-2040ENJournal of King Saud University: Engineering Sciences, Vol 33, Iss 8, Pp 531-538 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Propane aromatization Bimetallic Co-impregnation Zinc/ZSM-5 Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Propane aromatization Bimetallic Co-impregnation Zinc/ZSM-5 Engineering (General). Civil engineering (General) TA1-2040 G.G. Oseke A.Y. Atta B. Mukhtar B.J. El-Yakubu B.O. Aderemi Increasing the catalytic stability of microporous Zn/ZSM-5 with copper for enhanced propane aromatization
description	Catalytic transformation of light alkanes to aromatic compounds which are feedstocks to petrochemical industries is an important process. Here, a simple method of co-impregnation was employed to synthesize Zn-Cu/ZSM-5 for propane aromatization. Copper of varying loading 1–3 wt% was co-impregnated with zinc to improve zinc stability at the reaction condition. Catalyst physicochemical properties were analyzed using XRD, BET, N2-adsorption, FTIR, FTIR-Pyridine, SEM, TEM, H2-TPR and XPS. The XRD and FTIR characterization showed that the modified catalysts retained their crystallinity after metal impregnation with the XPS confirming the metal species having oxidation state of 2+. Hydrogen-TPR and XPS change in reduction temperature and binding energy spectra showed stronger intermetallic interaction respectively. Incorporation of Cu with Zn on ZSM-5 reduced Bronsted acidity from the FTIR-Pyridine while N2-adsorption isotherms verified the catalyst are microporous. The performance tests for propane aromatization over synthesized catalysts were carried out in a fixed bed reactor using GHSV of 1200 ml/g-h at 540 °C and atmospheric pressure. Co-impregnation of Zn with Cu improved the catalytic activity and sustained aromatic selectivity at an average of 85% for 12 h’ time on stream as compared to HZSM-5 (10%) and Zn/ZSM-5 (50%). Product distribution showed reduced light hydrocarbon formation and increased aromatic compounds with high selectivity towards toluene, m and o-xylene among the aromatic product distribution. The best aromatic selectivity product distribution was recorded for 2 wt% Cu with Zn, thus a more stable catalyst developed. XPS and H2-TPR analysis showed that the synergistic interaction between the two metals (Cu and Zn) improved the performance of bimetallic Zn-Cu/ZSM-5 catalyst by promoting zinc dispersion and stability during reaction.
format	article
author	G.G. Oseke A.Y. Atta B. Mukhtar B.J. El-Yakubu B.O. Aderemi
author_facet	G.G. Oseke A.Y. Atta B. Mukhtar B.J. El-Yakubu B.O. Aderemi
author_sort	G.G. Oseke
title	Increasing the catalytic stability of microporous Zn/ZSM-5 with copper for enhanced propane aromatization
title_short	Increasing the catalytic stability of microporous Zn/ZSM-5 with copper for enhanced propane aromatization
title_full	Increasing the catalytic stability of microporous Zn/ZSM-5 with copper for enhanced propane aromatization
title_fullStr	Increasing the catalytic stability of microporous Zn/ZSM-5 with copper for enhanced propane aromatization
title_full_unstemmed	Increasing the catalytic stability of microporous Zn/ZSM-5 with copper for enhanced propane aromatization
title_sort	increasing the catalytic stability of microporous zn/zsm-5 with copper for enhanced propane aromatization
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/981ca404b59c4875a5ceeeb5053483af
work_keys_str_mv	AT ggoseke increasingthecatalyticstabilityofmicroporousznzsm5withcopperforenhancedpropanearomatization AT ayatta increasingthecatalyticstabilityofmicroporousznzsm5withcopperforenhancedpropanearomatization AT bmukhtar increasingthecatalyticstabilityofmicroporousznzsm5withcopperforenhancedpropanearomatization AT bjelyakubu increasingthecatalyticstabilityofmicroporousznzsm5withcopperforenhancedpropanearomatization AT boaderemi increasingthecatalyticstabilityofmicroporousznzsm5withcopperforenhancedpropanearomatization
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Increasing the catalytic stability of microporous Zn/ZSM-5 with copper for enhanced propane aromatization

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