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Role of Strontium Cations in ZSM-5 Zeolite in the Methanol-to-Hydrocarbons Reaction

[Image: see text] The selectivity of the methanol-to-hydrocarbons (MTH) reaction can be tuned by modifying zeolite catalysts with alkaline earth metals, which typically increase propylene selectivity and catalyst stability. Here we employed Sr(2+) as its higher atomic number in comparison to the zeo...

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Autores principales: Liutkova, Anna, Drozhzhin, Victor, Heinrichs, Jason M. J. J., Jestl, Valentin, Evtushkova, Angelina, Mezari, Brahim, Mayoral, Álvaro, Kosinov, Nikolay, Hensen, Emiel J. M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2023
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10364136/
https://www.ncbi.nlm.nih.gov/pubmed/37439753
http://dx.doi.org/10.1021/acs.jpclett.3c01259
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author Liutkova, Anna
Drozhzhin, Victor
Heinrichs, Jason M. J. J.
Jestl, Valentin
Evtushkova, Angelina
Mezari, Brahim
Mayoral, Álvaro
Kosinov, Nikolay
Hensen, Emiel J. M.
author_facet Liutkova, Anna
Drozhzhin, Victor
Heinrichs, Jason M. J. J.
Jestl, Valentin
Evtushkova, Angelina
Mezari, Brahim
Mayoral, Álvaro
Kosinov, Nikolay
Hensen, Emiel J. M.
author_sort Liutkova, Anna
collection PubMed
description [Image: see text] The selectivity of the methanol-to-hydrocarbons (MTH) reaction can be tuned by modifying zeolite catalysts with alkaline earth metals, which typically increase propylene selectivity and catalyst stability. Here we employed Sr(2+) as its higher atomic number in comparison to the zeolite T atoms facilitates characterization by scanning transmission electron microscopy and operando X-ray absorption spectroscopy. Sr(2+) dispersed in the ZSM-5 micropores coordinates water, methanol, and dimethyl ether during the MTH reaction. Complementary characterization with nuclear magnetic resonance spectroscopy, thermogravimetric analysis combined with mass spectrometry, operando infrared spectroscopy, and X-ray diffraction points to the retention of substantially more adsorbates during the MTH reaction in comparison to Sr-free zeolites. Our findings support the notion that alkaline earth metals modify the porous reaction environment such that the olefin cycle is favored over the aromatic cycle in the MTH, explaining the increased propylene yield and lower deactivation rate.
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spelling pubmed-103641362023-07-25 Role of Strontium Cations in ZSM-5 Zeolite in the Methanol-to-Hydrocarbons Reaction Liutkova, Anna Drozhzhin, Victor Heinrichs, Jason M. J. J. Jestl, Valentin Evtushkova, Angelina Mezari, Brahim Mayoral, Álvaro Kosinov, Nikolay Hensen, Emiel J. M. J Phys Chem Lett [Image: see text] The selectivity of the methanol-to-hydrocarbons (MTH) reaction can be tuned by modifying zeolite catalysts with alkaline earth metals, which typically increase propylene selectivity and catalyst stability. Here we employed Sr(2+) as its higher atomic number in comparison to the zeolite T atoms facilitates characterization by scanning transmission electron microscopy and operando X-ray absorption spectroscopy. Sr(2+) dispersed in the ZSM-5 micropores coordinates water, methanol, and dimethyl ether during the MTH reaction. Complementary characterization with nuclear magnetic resonance spectroscopy, thermogravimetric analysis combined with mass spectrometry, operando infrared spectroscopy, and X-ray diffraction points to the retention of substantially more adsorbates during the MTH reaction in comparison to Sr-free zeolites. Our findings support the notion that alkaline earth metals modify the porous reaction environment such that the olefin cycle is favored over the aromatic cycle in the MTH, explaining the increased propylene yield and lower deactivation rate. American Chemical Society 2023-07-13 /pmc/articles/PMC10364136/ /pubmed/37439753 http://dx.doi.org/10.1021/acs.jpclett.3c01259 Text en © 2023 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Liutkova, Anna
Drozhzhin, Victor
Heinrichs, Jason M. J. J.
Jestl, Valentin
Evtushkova, Angelina
Mezari, Brahim
Mayoral, Álvaro
Kosinov, Nikolay
Hensen, Emiel J. M.
Role of Strontium Cations in ZSM-5 Zeolite in the Methanol-to-Hydrocarbons Reaction
title Role of Strontium Cations in ZSM-5 Zeolite in the Methanol-to-Hydrocarbons Reaction
title_full Role of Strontium Cations in ZSM-5 Zeolite in the Methanol-to-Hydrocarbons Reaction
title_fullStr Role of Strontium Cations in ZSM-5 Zeolite in the Methanol-to-Hydrocarbons Reaction
title_full_unstemmed Role of Strontium Cations in ZSM-5 Zeolite in the Methanol-to-Hydrocarbons Reaction
title_short Role of Strontium Cations in ZSM-5 Zeolite in the Methanol-to-Hydrocarbons Reaction
title_sort role of strontium cations in zsm-5 zeolite in the methanol-to-hydrocarbons reaction
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10364136/
https://www.ncbi.nlm.nih.gov/pubmed/37439753
http://dx.doi.org/10.1021/acs.jpclett.3c01259
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