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Effects of Mg, Ca, Sr, and Ba Dopants on the Performance of La(2)O(3) Catalysts for the Oxidative Coupling of Methane
[Image: see text] Oxidative coupling of methane (OCM) is a reaction to directly convert methane into high value-added hydrocarbons (C(2+)) such as ethylene and ethane using molecular oxygen and a catalyst. This work investigated lanthanum oxide catalysts for OCM, which were promoted with alkaline-ea...
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/PMC8771708/ https://www.ncbi.nlm.nih.gov/pubmed/35071872 http://dx.doi.org/10.1021/acsomega.1c04738 |
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author | Kiatsaengthong, Danusorn Jaroenpanon, Kanticha Somchuea, Pooripong Chukeaw, Thanaphat Chareonpanich, Metta Faungnawakij, Kajornsak Sohn, Hiesang Rupprechter, Günther Seubsai, Anusorn |
author_facet | Kiatsaengthong, Danusorn Jaroenpanon, Kanticha Somchuea, Pooripong Chukeaw, Thanaphat Chareonpanich, Metta Faungnawakij, Kajornsak Sohn, Hiesang Rupprechter, Günther Seubsai, Anusorn |
author_sort | Kiatsaengthong, Danusorn |
collection | PubMed |
description | [Image: see text] Oxidative coupling of methane (OCM) is a reaction to directly convert methane into high value-added hydrocarbons (C(2+)) such as ethylene and ethane using molecular oxygen and a catalyst. This work investigated lanthanum oxide catalysts for OCM, which were promoted with alkaline-earth metal oxides (Mg, Ca, Sr, and Ba) and prepared by the solution-mixing method. The synthesized catalysts were characterized using X-ray powder diffraction, CO(2)-programmed desorption, and X-ray photoelectron spectroscopy. The comparative performance of each promoter showed that promising lanthanum-loaded alkaline-earth metal oxide catalysts were La-Sr and La-Ba. In contrast, the combination of La with Ca or Mg did not lead to a clear improvement of C(2+) yield. The most promising LaSr50 catalyst exhibited the highest C(2+) yield of 17.2%, with a 56.0% C(2+) selectivity and a 30.9% CH(4) conversion. Catalyst characterization indicated that their activity was strongly associated with moderate basic sites and surface-adsorbed oxygen species of O(2)(–). Moreover, the catalyst was stable over 25 h at a reactor temperature of 700 °C. |
format | Online Article Text |
id | pubmed-8771708 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-87717082022-01-21 Effects of Mg, Ca, Sr, and Ba Dopants on the Performance of La(2)O(3) Catalysts for the Oxidative Coupling of Methane Kiatsaengthong, Danusorn Jaroenpanon, Kanticha Somchuea, Pooripong Chukeaw, Thanaphat Chareonpanich, Metta Faungnawakij, Kajornsak Sohn, Hiesang Rupprechter, Günther Seubsai, Anusorn ACS Omega [Image: see text] Oxidative coupling of methane (OCM) is a reaction to directly convert methane into high value-added hydrocarbons (C(2+)) such as ethylene and ethane using molecular oxygen and a catalyst. This work investigated lanthanum oxide catalysts for OCM, which were promoted with alkaline-earth metal oxides (Mg, Ca, Sr, and Ba) and prepared by the solution-mixing method. The synthesized catalysts were characterized using X-ray powder diffraction, CO(2)-programmed desorption, and X-ray photoelectron spectroscopy. The comparative performance of each promoter showed that promising lanthanum-loaded alkaline-earth metal oxide catalysts were La-Sr and La-Ba. In contrast, the combination of La with Ca or Mg did not lead to a clear improvement of C(2+) yield. The most promising LaSr50 catalyst exhibited the highest C(2+) yield of 17.2%, with a 56.0% C(2+) selectivity and a 30.9% CH(4) conversion. Catalyst characterization indicated that their activity was strongly associated with moderate basic sites and surface-adsorbed oxygen species of O(2)(–). Moreover, the catalyst was stable over 25 h at a reactor temperature of 700 °C. American Chemical Society 2022-01-04 /pmc/articles/PMC8771708/ /pubmed/35071872 http://dx.doi.org/10.1021/acsomega.1c04738 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 | Kiatsaengthong, Danusorn Jaroenpanon, Kanticha Somchuea, Pooripong Chukeaw, Thanaphat Chareonpanich, Metta Faungnawakij, Kajornsak Sohn, Hiesang Rupprechter, Günther Seubsai, Anusorn Effects of Mg, Ca, Sr, and Ba Dopants on the Performance of La(2)O(3) Catalysts for the Oxidative Coupling of Methane |
title | Effects of Mg, Ca, Sr, and Ba Dopants on the Performance
of La(2)O(3) Catalysts for the Oxidative Coupling
of Methane |
title_full | Effects of Mg, Ca, Sr, and Ba Dopants on the Performance
of La(2)O(3) Catalysts for the Oxidative Coupling
of Methane |
title_fullStr | Effects of Mg, Ca, Sr, and Ba Dopants on the Performance
of La(2)O(3) Catalysts for the Oxidative Coupling
of Methane |
title_full_unstemmed | Effects of Mg, Ca, Sr, and Ba Dopants on the Performance
of La(2)O(3) Catalysts for the Oxidative Coupling
of Methane |
title_short | Effects of Mg, Ca, Sr, and Ba Dopants on the Performance
of La(2)O(3) Catalysts for the Oxidative Coupling
of Methane |
title_sort | effects of mg, ca, sr, and ba dopants on the performance
of la(2)o(3) catalysts for the oxidative coupling
of methane |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8771708/ https://www.ncbi.nlm.nih.gov/pubmed/35071872 http://dx.doi.org/10.1021/acsomega.1c04738 |
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