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ZSM-5 Catalysts for MTO: Effect and Optimization of the Tetrapropylammonium Hydroxide Concentration on Synthesis and Performance
[Image: see text] Light olefin production from methanol using various zeolite catalysts has industrial and economic importance considering the growth of the petrochemical market. Zeolites are generally synthesized using various organic templates as structure-directing agents (SDAs). In this study, s...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2022
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9245136/ https://www.ncbi.nlm.nih.gov/pubmed/35785282 http://dx.doi.org/10.1021/acsomega.2c01539 |
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author | Sanhoob, Mohammed A. Khan, Abuzar Ummer, Aniz Chennampilly |
author_facet | Sanhoob, Mohammed A. Khan, Abuzar Ummer, Aniz Chennampilly |
author_sort | Sanhoob, Mohammed A. |
collection | PubMed |
description | [Image: see text] Light olefin production from methanol using various zeolite catalysts has industrial and economic importance considering the growth of the petrochemical market. Zeolites are generally synthesized using various organic templates as structure-directing agents (SDAs). In this study, synthesis of a series of ZSM-5 zeolites was performed systematically using the microwave-assisted crystallization method, and these samples were analyzed in detail to understand the effect of the SDA concentration. Powder diffraction, N(2) adsorption, scanning electron microscopy, ammonia adsorption desorption, and (27)Al and (29)Si NMR spectroscopies were used for the characterization. The organic SDA tetrapropyl ammonium hydroxide (TPAOH/SiO(2) mole ratio = 0.0500) is found to have an optimum concentration against the silica precursor for achieving the highest crystallinity, suitable morphology, ideal pore size, effective pore volume, and tuned microporous/mesoporous area. For samples with a template concentration ratio of 0.050 or higher, (29)Si and (27)Al NMR data revealed the presence of an intact ZSM-5 structure. Using a fixed bed reactor at 500 °C and atmospheric pressure, the catalytic performance of the selected catalysts from the series is investigated for the methanol-to-olefin conversion reaction. The sample with the highest crystallinity showed the best conversion, selectivity toward light olefins, and time on stream stability. It is also worth noting that the highest crystallinity, micropore area, and micropore volume are reached for the optimum value rather than the highest template concentration. This allows for a reduction in the template concentration and a move closer to a synthesis pathway benign to environment and economics. |
format | Online Article Text |
id | pubmed-9245136 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-92451362022-07-01 ZSM-5 Catalysts for MTO: Effect and Optimization of the Tetrapropylammonium Hydroxide Concentration on Synthesis and Performance Sanhoob, Mohammed A. Khan, Abuzar Ummer, Aniz Chennampilly ACS Omega [Image: see text] Light olefin production from methanol using various zeolite catalysts has industrial and economic importance considering the growth of the petrochemical market. Zeolites are generally synthesized using various organic templates as structure-directing agents (SDAs). In this study, synthesis of a series of ZSM-5 zeolites was performed systematically using the microwave-assisted crystallization method, and these samples were analyzed in detail to understand the effect of the SDA concentration. Powder diffraction, N(2) adsorption, scanning electron microscopy, ammonia adsorption desorption, and (27)Al and (29)Si NMR spectroscopies were used for the characterization. The organic SDA tetrapropyl ammonium hydroxide (TPAOH/SiO(2) mole ratio = 0.0500) is found to have an optimum concentration against the silica precursor for achieving the highest crystallinity, suitable morphology, ideal pore size, effective pore volume, and tuned microporous/mesoporous area. For samples with a template concentration ratio of 0.050 or higher, (29)Si and (27)Al NMR data revealed the presence of an intact ZSM-5 structure. Using a fixed bed reactor at 500 °C and atmospheric pressure, the catalytic performance of the selected catalysts from the series is investigated for the methanol-to-olefin conversion reaction. The sample with the highest crystallinity showed the best conversion, selectivity toward light olefins, and time on stream stability. It is also worth noting that the highest crystallinity, micropore area, and micropore volume are reached for the optimum value rather than the highest template concentration. This allows for a reduction in the template concentration and a move closer to a synthesis pathway benign to environment and economics. American Chemical Society 2022-06-15 /pmc/articles/PMC9245136/ /pubmed/35785282 http://dx.doi.org/10.1021/acsomega.2c01539 Text en © 2022 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
spellingShingle | Sanhoob, Mohammed A. Khan, Abuzar Ummer, Aniz Chennampilly ZSM-5 Catalysts for MTO: Effect and Optimization of the Tetrapropylammonium Hydroxide Concentration on Synthesis and Performance |
title | ZSM-5 Catalysts for MTO: Effect and Optimization
of the Tetrapropylammonium Hydroxide Concentration on Synthesis and
Performance |
title_full | ZSM-5 Catalysts for MTO: Effect and Optimization
of the Tetrapropylammonium Hydroxide Concentration on Synthesis and
Performance |
title_fullStr | ZSM-5 Catalysts for MTO: Effect and Optimization
of the Tetrapropylammonium Hydroxide Concentration on Synthesis and
Performance |
title_full_unstemmed | ZSM-5 Catalysts for MTO: Effect and Optimization
of the Tetrapropylammonium Hydroxide Concentration on Synthesis and
Performance |
title_short | ZSM-5 Catalysts for MTO: Effect and Optimization
of the Tetrapropylammonium Hydroxide Concentration on Synthesis and
Performance |
title_sort | zsm-5 catalysts for mto: effect and optimization
of the tetrapropylammonium hydroxide concentration on synthesis and
performance |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9245136/ https://www.ncbi.nlm.nih.gov/pubmed/35785282 http://dx.doi.org/10.1021/acsomega.2c01539 |
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