Synergistic effect in the CO2-oxidative dehydrogenation of propane to propylene over IrPt catalysts supported on mesoporous Mg-SBA-15

The effect of partial Pt substitution by Ir on the propylene formation via CO2-oxidative dehydrogenation of propane (CO2-ODH) has been investigated. To decrease coke formation, the synthetized Pt, Ir and PtIr catalysts were supported on mesoporous silica (SBA-15) modified with Mg (∼2.9 wt%). The bes...

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Autores: Lara-Moreno, L., Sánchez-López, P., Torres, S.A.G., Pawelec, B., Yerga, R.M.N., Moyado, S.F., López-Chico, D.Y., Zepeda, T.A.
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2025
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/425166
Acesso em linha:http://hdl.handle.net/10261/425166
https://www.scopus.com/inward/record.uri?eid=2-s2.0-105009010983&doi=10.1016%2Fj.micromeso.2025.113730&partnerID=40&md5=bcc2523d8c30a76ea83fc37133bbefb6
Access Level:acceso abierto
Palavra-chave:Carbon dioxide
Magnesium oxide-SBA-15
Mild oxidative dehydrogenation
Platinum-iridium catalysts
Propane to propylene
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spelling Synergistic effect in the CO2-oxidative dehydrogenation of propane to propylene over IrPt catalysts supported on mesoporous Mg-SBA-15Lara-Moreno, L.Sánchez-López, P.Torres, S.A.G.Pawelec, B.Yerga, R.M.N.Moyado, S.F.López-Chico, D.Y.Zepeda, T.A.Carbon dioxideMagnesium oxide-SBA-15Mild oxidative dehydrogenationPlatinum-iridium catalystsPropane to propyleneThe effect of partial Pt substitution by Ir on the propylene formation via CO2-oxidative dehydrogenation of propane (CO2-ODH) has been investigated. To decrease coke formation, the synthetized Pt, Ir and PtIr catalysts were supported on mesoporous silica (SBA-15) modified with Mg (∼2.9 wt%). The best propylene production was archived with the PtIrMg-1.5 catalyst showing a highest degree of Pt substitution with Ir (Pt/Ir at a ratio of 1.5). Characterization of the catalyst by various techniques (ICP-OES, XRD, FTIR of adsorbed pyridine, XPS and HRTEM) showed that partial substitution of Pt by Ir influences the nature of the surface acid sites and leads to easier reduction of Pt2+ species. The catalyst efficiency toward propane formation from CO2 follows the trend: PtIrMg-1.5 > PtIrMg-4 > PtMg > IrMg. The highest propylene selectivity exhibited IrMg catalyst showing the lowest propane conversion. It was found that propane conversion decreases lineally with increasing Brønsted acidity and increases with increasing Lewis-to-Brønsted acidity ratio. The synergy effect observed in reaction over PtIrMg-1.5 catalyst was attributed to the cumulative effects of its lowest Brønsted acidity, largest Ir content, Pt-Ir alloy formation and the stabilizing effect of the MgO nanoparticles decorating support surface. © 2025 The AuthorsPeer reviewedElsevierConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202620262025info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/425166https://www.scopus.com/inward/record.uri?eid=2-s2.0-105009010983&doi=10.1016%2Fj.micromeso.2025.113730&partnerID=40&md5=bcc2523d8c30a76ea83fc37133bbefb6reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésThe underlying dataset has been published as supplementary material of the article in the publisher platform at DOI https://doi.org/10.1016/j.micromeso.2025.113730https://doi.org/10.1016/j.micromeso.2025.113730Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/4251662026-05-22T06:33:51Z
dc.title.none.fl_str_mv Synergistic effect in the CO2-oxidative dehydrogenation of propane to propylene over IrPt catalysts supported on mesoporous Mg-SBA-15
title Synergistic effect in the CO2-oxidative dehydrogenation of propane to propylene over IrPt catalysts supported on mesoporous Mg-SBA-15
spellingShingle Synergistic effect in the CO2-oxidative dehydrogenation of propane to propylene over IrPt catalysts supported on mesoporous Mg-SBA-15
Lara-Moreno, L.
Carbon dioxide
Magnesium oxide-SBA-15
Mild oxidative dehydrogenation
Platinum-iridium catalysts
Propane to propylene
title_short Synergistic effect in the CO2-oxidative dehydrogenation of propane to propylene over IrPt catalysts supported on mesoporous Mg-SBA-15
title_full Synergistic effect in the CO2-oxidative dehydrogenation of propane to propylene over IrPt catalysts supported on mesoporous Mg-SBA-15
title_fullStr Synergistic effect in the CO2-oxidative dehydrogenation of propane to propylene over IrPt catalysts supported on mesoporous Mg-SBA-15
title_full_unstemmed Synergistic effect in the CO2-oxidative dehydrogenation of propane to propylene over IrPt catalysts supported on mesoporous Mg-SBA-15
title_sort Synergistic effect in the CO2-oxidative dehydrogenation of propane to propylene over IrPt catalysts supported on mesoporous Mg-SBA-15
dc.creator.none.fl_str_mv Lara-Moreno, L.
Sánchez-López, P.
Torres, S.A.G.
Pawelec, B.
Yerga, R.M.N.
Moyado, S.F.
López-Chico, D.Y.
Zepeda, T.A.
author Lara-Moreno, L.
author_facet Lara-Moreno, L.
Sánchez-López, P.
Torres, S.A.G.
Pawelec, B.
Yerga, R.M.N.
Moyado, S.F.
López-Chico, D.Y.
Zepeda, T.A.
author_role author
author2 Sánchez-López, P.
Torres, S.A.G.
Pawelec, B.
Yerga, R.M.N.
Moyado, S.F.
López-Chico, D.Y.
Zepeda, T.A.
author2_role author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Carbon dioxide
Magnesium oxide-SBA-15
Mild oxidative dehydrogenation
Platinum-iridium catalysts
Propane to propylene
topic Carbon dioxide
Magnesium oxide-SBA-15
Mild oxidative dehydrogenation
Platinum-iridium catalysts
Propane to propylene
description The effect of partial Pt substitution by Ir on the propylene formation via CO2-oxidative dehydrogenation of propane (CO2-ODH) has been investigated. To decrease coke formation, the synthetized Pt, Ir and PtIr catalysts were supported on mesoporous silica (SBA-15) modified with Mg (∼2.9 wt%). The best propylene production was archived with the PtIrMg-1.5 catalyst showing a highest degree of Pt substitution with Ir (Pt/Ir at a ratio of 1.5). Characterization of the catalyst by various techniques (ICP-OES, XRD, FTIR of adsorbed pyridine, XPS and HRTEM) showed that partial substitution of Pt by Ir influences the nature of the surface acid sites and leads to easier reduction of Pt2+ species. The catalyst efficiency toward propane formation from CO2 follows the trend: PtIrMg-1.5 > PtIrMg-4 > PtMg > IrMg. The highest propylene selectivity exhibited IrMg catalyst showing the lowest propane conversion. It was found that propane conversion decreases lineally with increasing Brønsted acidity and increases with increasing Lewis-to-Brønsted acidity ratio. The synergy effect observed in reaction over PtIrMg-1.5 catalyst was attributed to the cumulative effects of its lowest Brønsted acidity, largest Ir content, Pt-Ir alloy formation and the stabilizing effect of the MgO nanoparticles decorating support surface. © 2025 The Authors
publishDate 2025
dc.date.none.fl_str_mv 2025
2026
2026
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/425166
https://www.scopus.com/inward/record.uri?eid=2-s2.0-105009010983&doi=10.1016%2Fj.micromeso.2025.113730&partnerID=40&md5=bcc2523d8c30a76ea83fc37133bbefb6
url http://hdl.handle.net/10261/425166
https://www.scopus.com/inward/record.uri?eid=2-s2.0-105009010983&doi=10.1016%2Fj.micromeso.2025.113730&partnerID=40&md5=bcc2523d8c30a76ea83fc37133bbefb6
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv The underlying dataset has been published as supplementary material of the article in the publisher platform at DOI https://doi.org/10.1016/j.micromeso.2025.113730
https://doi.org/10.1016/j.micromeso.2025.113730
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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