Preferential CO oxidation on Pt?Cu/Al2O3 catalysts with low Pt loadings

Autores
Gómez, Leticia Ester; Sollier, Brenda Maria del Valle; Mizrahi, Martin Daniel; Ramallo Lopez, Jose Martin; Miro, Eduardo Ernesto; Boix, Alicia Viviana
Año de publicación
2014
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
This work demonstrates that a small loading of Pt (0.2 to 0.5 wt.%) selectively located at the top of the Cu/Al2O3 solid is enough to obtain active catalysts for the COPrOx reaction. The characterizations of the catalysts prepared in this work using different Pt:Cu ratios show that the phases formed strongly depend on the Cu and Pt loadings. For the samples with 4 wt.% of Cu, the formation of defective CuAl2O4-like species is predominant, with Cu2+ occupying distorted sites in the alumina surface. For the samples with 8 wt.% of Cu, CuO and metallic Cu in the form of small crystals are observed besides Cu2+. For both 0.2 and 0.5 wt. % of Pt, some proportion of Cu-Pt alloy is found which increased with the Cu content. Metallic Pt particles are only observed by EXAFS for the samples with a higher loading of the noble metal.
The higher CO conversions at low temperatures were obtained for the Pt0.5Cu8/Al2O3 sample, probably due to the simultaneous formation of small Pt crystals in close contact with CuO. The XPS results show that a strong surface enrichment in Pt takes place in all the samples. Thus, a small loading of the noble metal is enough to obtain effective catalysts. The surface Pt enrichment observed is most probably due to the impregnation of the Pt salt onto the Cu/Al2O3 solid, with a relatively low calcination temperature (300 °C) that prevents the formation of bulky CuAl2O4 spinel crystals.
Fil: Gómez, Leticia Ester. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Investigaciones En Catálisis y Petroquímica; Argentina
Fil: Sollier, Brenda Maria del Valle. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Investigaciones En Catálisis y Petroquímica; Argentina
Fil: Mizrahi, Martin Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina
Fil: Ramallo Lopez, Jose Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina
Fil: Miro, Eduardo Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Investigaciones En Catálisis y Petroquímica; Argentina
Fil: Boix, Alicia Viviana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Investigaciones En Catálisis y Petroquímica; Argentina
Materia
Hydrogen
Purification
Coprox
Catalysis
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/6520
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/6520
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Preferential CO oxidation on Pt?Cu/Al2O3 catalysts with low Pt loadingsGómez, Leticia EsterSollier, Brenda Maria del ValleMizrahi, Martin DanielRamallo Lopez, Jose MartinMiro, Eduardo ErnestoBoix, Alicia VivianaHydrogenPurificationCoproxCatalysishttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1This work demonstrates that a small loading of Pt (0.2 to 0.5 wt.%) selectively located at the top of the Cu/Al2O3 solid is enough to obtain active catalysts for the COPrOx reaction. The characterizations of the catalysts prepared in this work using different Pt:Cu ratios show that the phases formed strongly depend on the Cu and Pt loadings. For the samples with 4 wt.% of Cu, the formation of defective CuAl2O4-like species is predominant, with Cu2+ occupying distorted sites in the alumina surface. For the samples with 8 wt.% of Cu, CuO and metallic Cu in the form of small crystals are observed besides Cu2+. For both 0.2 and 0.5 wt. % of Pt, some proportion of Cu-Pt alloy is found which increased with the Cu content. Metallic Pt particles are only observed by EXAFS for the samples with a higher loading of the noble metal.<br />The higher CO conversions at low temperatures were obtained for the Pt0.5Cu8/Al2O3 sample, probably due to the simultaneous formation of small Pt crystals in close contact with CuO. The XPS results show that a strong surface enrichment in Pt takes place in all the samples. Thus, a small loading of the noble metal is enough to obtain effective catalysts. The surface Pt enrichment observed is most probably due to the impregnation of the Pt salt onto the Cu/Al2O3 solid, with a relatively low calcination temperature (300 °C) that prevents the formation of bulky CuAl2O4 spinel crystals.Fil: Gómez, Leticia Ester. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Investigaciones En Catálisis y Petroquímica; ArgentinaFil: Sollier, Brenda Maria del Valle. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Investigaciones En Catálisis y Petroquímica; ArgentinaFil: Mizrahi, Martin Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; ArgentinaFil: Ramallo Lopez, Jose Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; ArgentinaFil: Miro, Eduardo Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Investigaciones En Catálisis y Petroquímica; ArgentinaFil: Boix, Alicia Viviana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Investigaciones En Catálisis y Petroquímica; ArgentinaElsevier2014-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/6520Gómez, Leticia Ester; Sollier, Brenda Maria del Valle; Mizrahi, Martin Daniel; Ramallo Lopez, Jose Martin; Miro, Eduardo Ernesto; et al.; Preferential CO oxidation on Pt?Cu/Al2O3 catalysts with low Pt loadings; Elsevier; International Journal of Hydrogen Energy; 39; 8; 2-2014; 3719-37290360-3199enginfo:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0360319913031388info:eu-repo/semantics/altIdentifier/doi/info:eu-repo/semantics/altIdentifier/doi/10.1016/j.ijhydene.2013.12.146info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-17T11:56:33Zoai:ri.conicet.gov.ar:11336/6520instacron: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:34982025-09-17 11:56:33.499CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Preferential CO oxidation on Pt?Cu/Al2O3 catalysts with low Pt loadings
title Preferential CO oxidation on Pt?Cu/Al2O3 catalysts with low Pt loadings
spellingShingle Preferential CO oxidation on Pt?Cu/Al2O3 catalysts with low Pt loadings
Gómez, Leticia Ester
Hydrogen
Purification
Coprox
Catalysis
title_short Preferential CO oxidation on Pt?Cu/Al2O3 catalysts with low Pt loadings
title_full Preferential CO oxidation on Pt?Cu/Al2O3 catalysts with low Pt loadings
title_fullStr Preferential CO oxidation on Pt?Cu/Al2O3 catalysts with low Pt loadings
title_full_unstemmed Preferential CO oxidation on Pt?Cu/Al2O3 catalysts with low Pt loadings
title_sort Preferential CO oxidation on Pt?Cu/Al2O3 catalysts with low Pt loadings
dc.creator.none.fl_str_mv Gómez, Leticia Ester
Sollier, Brenda Maria del Valle
Mizrahi, Martin Daniel
Ramallo Lopez, Jose Martin
Miro, Eduardo Ernesto
Boix, Alicia Viviana
author Gómez, Leticia Ester
author_facet Gómez, Leticia Ester
Sollier, Brenda Maria del Valle
Mizrahi, Martin Daniel
Ramallo Lopez, Jose Martin
Miro, Eduardo Ernesto
Boix, Alicia Viviana
author_role author
author2 Sollier, Brenda Maria del Valle
Mizrahi, Martin Daniel
Ramallo Lopez, Jose Martin
Miro, Eduardo Ernesto
Boix, Alicia Viviana
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Hydrogen
Purification
Coprox
Catalysis
topic Hydrogen
Purification
Coprox
Catalysis
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv This work demonstrates that a small loading of Pt (0.2 to 0.5 wt.%) selectively located at the top of the Cu/Al2O3 solid is enough to obtain active catalysts for the COPrOx reaction. The characterizations of the catalysts prepared in this work using different Pt:Cu ratios show that the phases formed strongly depend on the Cu and Pt loadings. For the samples with 4 wt.% of Cu, the formation of defective CuAl2O4-like species is predominant, with Cu2+ occupying distorted sites in the alumina surface. For the samples with 8 wt.% of Cu, CuO and metallic Cu in the form of small crystals are observed besides Cu2+. For both 0.2 and 0.5 wt. % of Pt, some proportion of Cu-Pt alloy is found which increased with the Cu content. Metallic Pt particles are only observed by EXAFS for the samples with a higher loading of the noble metal.<br />The higher CO conversions at low temperatures were obtained for the Pt0.5Cu8/Al2O3 sample, probably due to the simultaneous formation of small Pt crystals in close contact with CuO. The XPS results show that a strong surface enrichment in Pt takes place in all the samples. Thus, a small loading of the noble metal is enough to obtain effective catalysts. The surface Pt enrichment observed is most probably due to the impregnation of the Pt salt onto the Cu/Al2O3 solid, with a relatively low calcination temperature (300 °C) that prevents the formation of bulky CuAl2O4 spinel crystals.
Fil: Gómez, Leticia Ester. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Investigaciones En Catálisis y Petroquímica; Argentina
Fil: Sollier, Brenda Maria del Valle. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Investigaciones En Catálisis y Petroquímica; Argentina
Fil: Mizrahi, Martin Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina
Fil: Ramallo Lopez, Jose Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina
Fil: Miro, Eduardo Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Investigaciones En Catálisis y Petroquímica; Argentina
Fil: Boix, Alicia Viviana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Investigaciones En Catálisis y Petroquímica; Argentina
description This work demonstrates that a small loading of Pt (0.2 to 0.5 wt.%) selectively located at the top of the Cu/Al2O3 solid is enough to obtain active catalysts for the COPrOx reaction. The characterizations of the catalysts prepared in this work using different Pt:Cu ratios show that the phases formed strongly depend on the Cu and Pt loadings. For the samples with 4 wt.% of Cu, the formation of defective CuAl2O4-like species is predominant, with Cu2+ occupying distorted sites in the alumina surface. For the samples with 8 wt.% of Cu, CuO and metallic Cu in the form of small crystals are observed besides Cu2+. For both 0.2 and 0.5 wt. % of Pt, some proportion of Cu-Pt alloy is found which increased with the Cu content. Metallic Pt particles are only observed by EXAFS for the samples with a higher loading of the noble metal.<br />The higher CO conversions at low temperatures were obtained for the Pt0.5Cu8/Al2O3 sample, probably due to the simultaneous formation of small Pt crystals in close contact with CuO. The XPS results show that a strong surface enrichment in Pt takes place in all the samples. Thus, a small loading of the noble metal is enough to obtain effective catalysts. The surface Pt enrichment observed is most probably due to the impregnation of the Pt salt onto the Cu/Al2O3 solid, with a relatively low calcination temperature (300 °C) that prevents the formation of bulky CuAl2O4 spinel crystals.
publishDate 2014
dc.date.none.fl_str_mv 2014-02
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/11336/6520
Gómez, Leticia Ester; Sollier, Brenda Maria del Valle; Mizrahi, Martin Daniel; Ramallo Lopez, Jose Martin; Miro, Eduardo Ernesto; et al.; Preferential CO oxidation on Pt?Cu/Al2O3 catalysts with low Pt loadings; Elsevier; International Journal of Hydrogen Energy; 39; 8; 2-2014; 3719-3729
0360-3199
url http://hdl.handle.net/11336/6520
identifier_str_mv Gómez, Leticia Ester; Sollier, Brenda Maria del Valle; Mizrahi, Martin Daniel; Ramallo Lopez, Jose Martin; Miro, Eduardo Ernesto; et al.; Preferential CO oxidation on Pt?Cu/Al2O3 catalysts with low Pt loadings; Elsevier; International Journal of Hydrogen Energy; 39; 8; 2-2014; 3719-3729
0360-3199
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0360319913031388
info:eu-repo/semantics/altIdentifier/doi/
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.ijhydene.2013.12.146
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
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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score 13.000565

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