Perovskite-derived MnOx/LaMnO3 nanocomposites to boost CO oxidation activity

In this study, the impact of nitric acid treatment parameters, specifically acid concentration and exposure time, on the morphological, redox, and catalytic properties of LaMnO3 for CO oxidation was thoroughly investigated. The samples were characterised by ICP analysis, N2 adsorption/desorption mea...

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Autores: Felli, Andrea, Toso, Alessandra, Braga, Andrea, Colussi, Sara, Boaro, Marta, Llorca Piqué, Jordi|||0000-0002-7447-9582, Truscott, Byron, Artner Wallner, Christine, Trovarelli, Alessandro
Tipo de recurso: artículo
Fecha de publicación:2025
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/424791
Acceso en línea:https://hdl.handle.net/2117/424791
https://dx.doi.org/10.1039/d4cy01418a
Access Level:acceso abierto
Palabra clave:Nanocomposites (Materials)
Nanocompòsits (Materials)
Àrees temàtiques de la UPC::Enginyeria dels materials
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spelling Perovskite-derived MnOx/LaMnO3 nanocomposites to boost CO oxidation activityFelli, AndreaToso, AlessandraBraga, AndreaColussi, SaraBoaro, MartaLlorca Piqué, Jordi|||0000-0002-7447-9582Truscott, ByronArtner Wallner, ChristineTrovarelli, AlessandroNanocomposites (Materials)Nanocompòsits (Materials)Àrees temàtiques de la UPC::Enginyeria dels materialsIn this study, the impact of nitric acid treatment parameters, specifically acid concentration and exposure time, on the morphological, redox, and catalytic properties of LaMnO3 for CO oxidation was thoroughly investigated. The samples were characterised by ICP analysis, N2 adsorption/desorption measurements, XRD, H2-TPR, XPS, HRTEM and HAADF-STEM. Acidic treatment of LaMnO3 significantly increases the surface area, creating a new porous structure. Under mild treatment conditions, the composition, crystal structure and morphology are also modified, resulting in MnOx/LaMnO3 catalysts with various Mn oxide species forming needle-like structures segregated on a highly defective La1-xMnO3-d perovskite. These MnOx/LaMnO3 nanocomposites exhibited superior CO oxidation activity, achieving 10% CO conversion (T10) in the range of 375–396 K, compared to 459 K for the pristine perovskite. This enhanced performance is attributed not only to the increased surface area, but also to the exposure of reactive MnOx species on the surface of the perovskite and, crucially, to the interfacial synergism between MnOx and LaMnO3. This synergy enhances oxygen exchange, and it improves the reducibility of the nanocomposite at low temperatures, providing a better thermal stability of active phases at elevated temperatures. However, the benefits of the acid treatment are lost under more severe conditions that transform LaMnO3 into bulk Mn oxide phases (Mn2O3, Mn3O4), or pure MnO2, highlighting the critical role of MnOx/LaMnO3 interface properties for CO oxidation.A. F. is grateful for funding under the REACT EU Italian PON 2014-2020 Program, Action IV.4 – Innovation and Action IV.5 – Green (DM 1062, 10/08/2021). J. L. is a Serra Húnter Fellow and is grateful to ICREA Academia program and projects MICIN/FEDER PID2021-124572OB-C31, CEX2023-001300-M (MCIN/AEI/10.13039/501100011033), and GC 2017 SGR 128. M. B. thanks MIUR for funding (PRIN project-DIRECTBIOSOFC, 2017FCFYHK, 2019–2022).20252025-01-0120252025-02-21journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/424791https://dx.doi.org/10.1039/d4cy01418areponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)InglésengAgencia Estatal de Investigación http://doi.org/10.13039/501100011033 Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023 PID2021-124572OB-C31 TECNOLOGIAS ENERGETICAS DEL HIDROGENO IMPULSADAS POR INGENIERIA DE INTERFAZ DE CATALIZADORES AMORFOS%2FCRISTALINOSopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial 3.0 Unportedhttps://creativecommons.org/licenses/by-nc/3.0/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/4247912026-05-27T15:37:01Z
dc.title.none.fl_str_mv Perovskite-derived MnOx/LaMnO3 nanocomposites to boost CO oxidation activity
title Perovskite-derived MnOx/LaMnO3 nanocomposites to boost CO oxidation activity
spellingShingle Perovskite-derived MnOx/LaMnO3 nanocomposites to boost CO oxidation activity
Felli, Andrea
Nanocomposites (Materials)
Nanocompòsits (Materials)
Àrees temàtiques de la UPC::Enginyeria dels materials
title_short Perovskite-derived MnOx/LaMnO3 nanocomposites to boost CO oxidation activity
title_full Perovskite-derived MnOx/LaMnO3 nanocomposites to boost CO oxidation activity
title_fullStr Perovskite-derived MnOx/LaMnO3 nanocomposites to boost CO oxidation activity
title_full_unstemmed Perovskite-derived MnOx/LaMnO3 nanocomposites to boost CO oxidation activity
title_sort Perovskite-derived MnOx/LaMnO3 nanocomposites to boost CO oxidation activity
dc.creator.none.fl_str_mv Felli, Andrea
Toso, Alessandra
Braga, Andrea
Colussi, Sara
Boaro, Marta
Llorca Piqué, Jordi|||0000-0002-7447-9582
Truscott, Byron
Artner Wallner, Christine
Trovarelli, Alessandro
author Felli, Andrea
author_facet Felli, Andrea
Toso, Alessandra
Braga, Andrea
Colussi, Sara
Boaro, Marta
Llorca Piqué, Jordi|||0000-0002-7447-9582
Truscott, Byron
Artner Wallner, Christine
Trovarelli, Alessandro
author_role author
author2 Toso, Alessandra
Braga, Andrea
Colussi, Sara
Boaro, Marta
Llorca Piqué, Jordi|||0000-0002-7447-9582
Truscott, Byron
Artner Wallner, Christine
Trovarelli, Alessandro
author2_role author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Nanocomposites (Materials)
Nanocompòsits (Materials)
Àrees temàtiques de la UPC::Enginyeria dels materials
topic Nanocomposites (Materials)
Nanocompòsits (Materials)
Àrees temàtiques de la UPC::Enginyeria dels materials
description In this study, the impact of nitric acid treatment parameters, specifically acid concentration and exposure time, on the morphological, redox, and catalytic properties of LaMnO3 for CO oxidation was thoroughly investigated. The samples were characterised by ICP analysis, N2 adsorption/desorption measurements, XRD, H2-TPR, XPS, HRTEM and HAADF-STEM. Acidic treatment of LaMnO3 significantly increases the surface area, creating a new porous structure. Under mild treatment conditions, the composition, crystal structure and morphology are also modified, resulting in MnOx/LaMnO3 catalysts with various Mn oxide species forming needle-like structures segregated on a highly defective La1-xMnO3-d perovskite. These MnOx/LaMnO3 nanocomposites exhibited superior CO oxidation activity, achieving 10% CO conversion (T10) in the range of 375–396 K, compared to 459 K for the pristine perovskite. This enhanced performance is attributed not only to the increased surface area, but also to the exposure of reactive MnOx species on the surface of the perovskite and, crucially, to the interfacial synergism between MnOx and LaMnO3. This synergy enhances oxygen exchange, and it improves the reducibility of the nanocomposite at low temperatures, providing a better thermal stability of active phases at elevated temperatures. However, the benefits of the acid treatment are lost under more severe conditions that transform LaMnO3 into bulk Mn oxide phases (Mn2O3, Mn3O4), or pure MnO2, highlighting the critical role of MnOx/LaMnO3 interface properties for CO oxidation.
publishDate 2025
dc.date.none.fl_str_mv 2025
2025-01-01
2025
2025-02-21
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/424791
https://dx.doi.org/10.1039/d4cy01418a
url https://hdl.handle.net/2117/424791
https://dx.doi.org/10.1039/d4cy01418a
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv Agencia Estatal de Investigación http://doi.org/10.13039/501100011033 Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023 PID2021-124572OB-C31 TECNOLOGIAS ENERGETICAS DEL HIDROGENO IMPULSADAS POR INGENIERIA DE INTERFAZ DE CATALIZADORES AMORFOS%2FCRISTALINOS
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial 3.0 Unported
https://creativecommons.org/licenses/by-nc/3.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial 3.0 Unported
https://creativecommons.org/licenses/by-nc/3.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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