In-Situ DRIFT Study of Au-Ir/Ceria Catalysts: Activity and Stability for CO Oxidation

Autores
Aguirre, Alejo; Barrios, Celina; Aguilar Tapia, Antonio; Zanella, Rodolfo; Baltanas, Miguel Angel; Collins, Sebastián Enrique
Año de publicación
2016
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Monometallic gold and iridium, and bimetallic gold-iridium on ceria catalysts were synthesized by deposition-precipitation with urea. The activity of these ceria supported catalysts for CO oxidation was: Au-Ir >> Au > Ir. The bimetallic catalyst was highly active and stable during the carbon monoxide oxidation reaction, showing synergism between both metals. The catalysts were thoroughly characterized chemical and structurally. High-resolution electron microscopy coupled with energy dispersive spectroscopy and X-ray photoelectron spectroscopy showed evidences of iridium-gold intimacy. In situ infrared spectroscopy in the diffuse reflectance (DRIFT) mode was used to investigate the reactivity of the active sites. Concentration-modulation excitation spectroscopy (c-MES) allowed selective identification of intermediates and spectator species. CO chemisorbed onto iridium sites (2096, 2060 and 2012 cm-1) was found inactive, whereas carbon monoxide on metallic gold sites (Au0-CO, 2110 cm-1) exhibited reactivity for CO oxidation. In the bimetallic catalyst, new active sites (Au(-)-CO, 2095 and 2026 cm-1) together with Au0-CO species were observed, most likely produced by the isolation and stabilization of gold atoms by iridium.
Fil: Aguirre, Alejo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina
Fil: Barrios, Celina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina
Fil: Aguilar Tapia, Antonio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina
Fil: Zanella, Rodolfo. Centro de Ciencias Aplicadas y Desarrollo Tecnologico;
Fil: Baltanas, Miguel Angel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina
Fil: Collins, Sebastián Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina
Materia
Ceria
Co Oxidation
Drift
Modulation Excitation Spectroscopy
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/23806
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/23806
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling In-Situ DRIFT Study of Au-Ir/Ceria Catalysts: Activity and Stability for CO OxidationAguirre, AlejoBarrios, CelinaAguilar Tapia, AntonioZanella, RodolfoBaltanas, Miguel AngelCollins, Sebastián EnriqueCeriaCo OxidationDriftModulation Excitation Spectroscopyhttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1Monometallic gold and iridium, and bimetallic gold-iridium on ceria catalysts were synthesized by deposition-precipitation with urea. The activity of these ceria supported catalysts for CO oxidation was: Au-Ir >> Au > Ir. The bimetallic catalyst was highly active and stable during the carbon monoxide oxidation reaction, showing synergism between both metals. The catalysts were thoroughly characterized chemical and structurally. High-resolution electron microscopy coupled with energy dispersive spectroscopy and X-ray photoelectron spectroscopy showed evidences of iridium-gold intimacy. In situ infrared spectroscopy in the diffuse reflectance (DRIFT) mode was used to investigate the reactivity of the active sites. Concentration-modulation excitation spectroscopy (c-MES) allowed selective identification of intermediates and spectator species. CO chemisorbed onto iridium sites (2096, 2060 and 2012 cm-1) was found inactive, whereas carbon monoxide on metallic gold sites (Au0-CO, 2110 cm-1) exhibited reactivity for CO oxidation. In the bimetallic catalyst, new active sites (Au(-)-CO, 2095 and 2026 cm-1) together with Au0-CO species were observed, most likely produced by the isolation and stabilization of gold atoms by iridium.Fil: Aguirre, Alejo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; ArgentinaFil: Barrios, Celina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; ArgentinaFil: Aguilar Tapia, Antonio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; ArgentinaFil: Zanella, Rodolfo. Centro de Ciencias Aplicadas y Desarrollo Tecnologico;Fil: Baltanas, Miguel Angel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; ArgentinaFil: Collins, Sebastián Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; ArgentinaSpringer/plenum Publishers2016-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/23806Aguirre, Alejo; Barrios, Celina; Aguilar Tapia, Antonio; Zanella, Rodolfo; Baltanas, Miguel Angel; et al.; In-Situ DRIFT Study of Au-Ir/Ceria Catalysts: Activity and Stability for CO Oxidation; Springer/plenum Publishers; Topics In Catalysis; 59; 2-4; 2-2016; 347-3561022-5528CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://link.springer.com/article/10.1007%2Fs11244-015-0425-6info:eu-repo/semantics/altIdentifier/doi/10.1007/s11244-015-0425-6info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:51:30Zoai:ri.conicet.gov.ar:11336/23806instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:51:30.411CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv In-Situ DRIFT Study of Au-Ir/Ceria Catalysts: Activity and Stability for CO Oxidation
title In-Situ DRIFT Study of Au-Ir/Ceria Catalysts: Activity and Stability for CO Oxidation
spellingShingle In-Situ DRIFT Study of Au-Ir/Ceria Catalysts: Activity and Stability for CO Oxidation
Aguirre, Alejo
Ceria
Co Oxidation
Drift
Modulation Excitation Spectroscopy
title_short In-Situ DRIFT Study of Au-Ir/Ceria Catalysts: Activity and Stability for CO Oxidation
title_full In-Situ DRIFT Study of Au-Ir/Ceria Catalysts: Activity and Stability for CO Oxidation
title_fullStr In-Situ DRIFT Study of Au-Ir/Ceria Catalysts: Activity and Stability for CO Oxidation
title_full_unstemmed In-Situ DRIFT Study of Au-Ir/Ceria Catalysts: Activity and Stability for CO Oxidation
title_sort In-Situ DRIFT Study of Au-Ir/Ceria Catalysts: Activity and Stability for CO Oxidation
dc.creator.none.fl_str_mv Aguirre, Alejo
Barrios, Celina
Aguilar Tapia, Antonio
Zanella, Rodolfo
Baltanas, Miguel Angel
Collins, Sebastián Enrique
author Aguirre, Alejo
author_facet Aguirre, Alejo
Barrios, Celina
Aguilar Tapia, Antonio
Zanella, Rodolfo
Baltanas, Miguel Angel
Collins, Sebastián Enrique
author_role author
author2 Barrios, Celina
Aguilar Tapia, Antonio
Zanella, Rodolfo
Baltanas, Miguel Angel
Collins, Sebastián Enrique
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Ceria
Co Oxidation
Drift
Modulation Excitation Spectroscopy
topic Ceria
Co Oxidation
Drift
Modulation Excitation Spectroscopy
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Monometallic gold and iridium, and bimetallic gold-iridium on ceria catalysts were synthesized by deposition-precipitation with urea. The activity of these ceria supported catalysts for CO oxidation was: Au-Ir >> Au > Ir. The bimetallic catalyst was highly active and stable during the carbon monoxide oxidation reaction, showing synergism between both metals. The catalysts were thoroughly characterized chemical and structurally. High-resolution electron microscopy coupled with energy dispersive spectroscopy and X-ray photoelectron spectroscopy showed evidences of iridium-gold intimacy. In situ infrared spectroscopy in the diffuse reflectance (DRIFT) mode was used to investigate the reactivity of the active sites. Concentration-modulation excitation spectroscopy (c-MES) allowed selective identification of intermediates and spectator species. CO chemisorbed onto iridium sites (2096, 2060 and 2012 cm-1) was found inactive, whereas carbon monoxide on metallic gold sites (Au0-CO, 2110 cm-1) exhibited reactivity for CO oxidation. In the bimetallic catalyst, new active sites (Au(-)-CO, 2095 and 2026 cm-1) together with Au0-CO species were observed, most likely produced by the isolation and stabilization of gold atoms by iridium.
Fil: Aguirre, Alejo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina
Fil: Barrios, Celina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina
Fil: Aguilar Tapia, Antonio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina
Fil: Zanella, Rodolfo. Centro de Ciencias Aplicadas y Desarrollo Tecnologico;
Fil: Baltanas, Miguel Angel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina
Fil: Collins, Sebastián Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina
description Monometallic gold and iridium, and bimetallic gold-iridium on ceria catalysts were synthesized by deposition-precipitation with urea. The activity of these ceria supported catalysts for CO oxidation was: Au-Ir >> Au > Ir. The bimetallic catalyst was highly active and stable during the carbon monoxide oxidation reaction, showing synergism between both metals. The catalysts were thoroughly characterized chemical and structurally. High-resolution electron microscopy coupled with energy dispersive spectroscopy and X-ray photoelectron spectroscopy showed evidences of iridium-gold intimacy. In situ infrared spectroscopy in the diffuse reflectance (DRIFT) mode was used to investigate the reactivity of the active sites. Concentration-modulation excitation spectroscopy (c-MES) allowed selective identification of intermediates and spectator species. CO chemisorbed onto iridium sites (2096, 2060 and 2012 cm-1) was found inactive, whereas carbon monoxide on metallic gold sites (Au0-CO, 2110 cm-1) exhibited reactivity for CO oxidation. In the bimetallic catalyst, new active sites (Au(-)-CO, 2095 and 2026 cm-1) together with Au0-CO species were observed, most likely produced by the isolation and stabilization of gold atoms by iridium.
publishDate 2016
dc.date.none.fl_str_mv 2016-02
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/23806
Aguirre, Alejo; Barrios, Celina; Aguilar Tapia, Antonio; Zanella, Rodolfo; Baltanas, Miguel Angel; et al.; In-Situ DRIFT Study of Au-Ir/Ceria Catalysts: Activity and Stability for CO Oxidation; Springer/plenum Publishers; Topics In Catalysis; 59; 2-4; 2-2016; 347-356
1022-5528
CONICET Digital
CONICET
url http://hdl.handle.net/11336/23806
identifier_str_mv Aguirre, Alejo; Barrios, Celina; Aguilar Tapia, Antonio; Zanella, Rodolfo; Baltanas, Miguel Angel; et al.; In-Situ DRIFT Study of Au-Ir/Ceria Catalysts: Activity and Stability for CO Oxidation; Springer/plenum Publishers; Topics In Catalysis; 59; 2-4; 2-2016; 347-356
1022-5528
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://link.springer.com/article/10.1007%2Fs11244-015-0425-6
info:eu-repo/semantics/altIdentifier/doi/10.1007/s11244-015-0425-6
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
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eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Springer/plenum Publishers
publisher.none.fl_str_mv Springer/plenum Publishers
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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