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Tuning Selectivity in the Direct Conversion of Methane to Methanol: Bimetallic Synergistic Effects on the Cleavage of C–H and O–H Bonds over NiCu/CeO(2) Catalysts
[Image: see text] The efficient activation of methane and the simultaneous water dissociation are crucial in many catalytic reactions on oxide-supported transition metal catalysts. On very low-loaded Ni/CeO(2) surfaces, methane easily fully decomposes, CH(4) → C + 4H, and water dissociates, H(2)O→ O...
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/PMC9234976/ https://www.ncbi.nlm.nih.gov/pubmed/35699247 http://dx.doi.org/10.1021/acs.jpclett.2c00885 |
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author | Lustemberg, Pablo G. Senanayake, Sanjaya D. Rodriguez, José A. Ganduglia-Pirovano, M. Verónica |
author_facet | Lustemberg, Pablo G. Senanayake, Sanjaya D. Rodriguez, José A. Ganduglia-Pirovano, M. Verónica |
author_sort | Lustemberg, Pablo G. |
collection | PubMed |
description | [Image: see text] The efficient activation of methane and the simultaneous water dissociation are crucial in many catalytic reactions on oxide-supported transition metal catalysts. On very low-loaded Ni/CeO(2) surfaces, methane easily fully decomposes, CH(4) → C + 4H, and water dissociates, H(2)O→ OH + H. However, in important reactions such as the direct oxidation of methane to methanol (MTM), where complex interplay exists between reactants (CH(4), O(2)), it is desirable to avoid the complete dehydrogenation of methane to carbon. Remarkably, the barrier for the activation of C–H bonds in CH(x) (x = 1–3) species on Ni/CeO(2) surfaces can be manipulated by adding Cu, forming bimetallic NiCu clusters, whereas the ease for cleavage of O–H bonds in water is not affected by ensemble effects, as obtained from density functional theory-based calculations. CH(4) activation occurs only on Ni sites, and H(2)O activation occurs on both Ni and Cu sites. The MTM reaction pathway for the example of the Ni(3)Cu(1)/CeO(2) model catalyst predicts a higher selectivity and a lower activation barrier for methanol production, compared with that for Ni(4)/CeO(2). These findings point toward a possible strategy to design active and stable catalysts which can be employed for methane activation and conversions. |
format | Online Article Text |
id | pubmed-9234976 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-92349762022-06-28 Tuning Selectivity in the Direct Conversion of Methane to Methanol: Bimetallic Synergistic Effects on the Cleavage of C–H and O–H Bonds over NiCu/CeO(2) Catalysts Lustemberg, Pablo G. Senanayake, Sanjaya D. Rodriguez, José A. Ganduglia-Pirovano, M. Verónica J Phys Chem Lett [Image: see text] The efficient activation of methane and the simultaneous water dissociation are crucial in many catalytic reactions on oxide-supported transition metal catalysts. On very low-loaded Ni/CeO(2) surfaces, methane easily fully decomposes, CH(4) → C + 4H, and water dissociates, H(2)O→ OH + H. However, in important reactions such as the direct oxidation of methane to methanol (MTM), where complex interplay exists between reactants (CH(4), O(2)), it is desirable to avoid the complete dehydrogenation of methane to carbon. Remarkably, the barrier for the activation of C–H bonds in CH(x) (x = 1–3) species on Ni/CeO(2) surfaces can be manipulated by adding Cu, forming bimetallic NiCu clusters, whereas the ease for cleavage of O–H bonds in water is not affected by ensemble effects, as obtained from density functional theory-based calculations. CH(4) activation occurs only on Ni sites, and H(2)O activation occurs on both Ni and Cu sites. The MTM reaction pathway for the example of the Ni(3)Cu(1)/CeO(2) model catalyst predicts a higher selectivity and a lower activation barrier for methanol production, compared with that for Ni(4)/CeO(2). These findings point toward a possible strategy to design active and stable catalysts which can be employed for methane activation and conversions. American Chemical Society 2022-06-14 2022-06-23 /pmc/articles/PMC9234976/ /pubmed/35699247 http://dx.doi.org/10.1021/acs.jpclett.2c00885 Text en © 2022 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 | Lustemberg, Pablo G. Senanayake, Sanjaya D. Rodriguez, José A. Ganduglia-Pirovano, M. Verónica Tuning Selectivity in the Direct Conversion of Methane to Methanol: Bimetallic Synergistic Effects on the Cleavage of C–H and O–H Bonds over NiCu/CeO(2) Catalysts |
title | Tuning Selectivity in the Direct Conversion of Methane
to Methanol: Bimetallic Synergistic Effects on the Cleavage of C–H
and O–H Bonds over NiCu/CeO(2) Catalysts |
title_full | Tuning Selectivity in the Direct Conversion of Methane
to Methanol: Bimetallic Synergistic Effects on the Cleavage of C–H
and O–H Bonds over NiCu/CeO(2) Catalysts |
title_fullStr | Tuning Selectivity in the Direct Conversion of Methane
to Methanol: Bimetallic Synergistic Effects on the Cleavage of C–H
and O–H Bonds over NiCu/CeO(2) Catalysts |
title_full_unstemmed | Tuning Selectivity in the Direct Conversion of Methane
to Methanol: Bimetallic Synergistic Effects on the Cleavage of C–H
and O–H Bonds over NiCu/CeO(2) Catalysts |
title_short | Tuning Selectivity in the Direct Conversion of Methane
to Methanol: Bimetallic Synergistic Effects on the Cleavage of C–H
and O–H Bonds over NiCu/CeO(2) Catalysts |
title_sort | tuning selectivity in the direct conversion of methane
to methanol: bimetallic synergistic effects on the cleavage of c–h
and o–h bonds over nicu/ceo(2) catalysts |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9234976/ https://www.ncbi.nlm.nih.gov/pubmed/35699247 http://dx.doi.org/10.1021/acs.jpclett.2c00885 |
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