Catalytic combustion of methane on Co/MgO: characterisation of active cobalt sites

Autores
Ulla, Maria Alicia del H.; Spretz, R.; Lombardo, Eduardo Agustin; Daniell, W.; Knözinger, H.
Año de publicación
2001
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
A series of Co/MgO catalysts with 3–12 wt.% Co were prepared by impregnation and calcined at 1073 K for 10 h. The catalytic behaviour of these samples toward CH4 combustion was found to increase with cobalt loading, though a plateau was reached at ca. 9 wt.% Co content. Bulk characterisation was carried out using XRD, TPR and Raman spectroscopy, and showed that the solids were made up of a CoO–MgO solid solution and a MgO phase. A detailed examination of their surfaces was achieved through FTIR spectroscopy of adsorbed CO probe molecules, which indicated that at low cobalt loadings only a small proportion of the Co going into the solid solution was present on exposed faces as either Co2+ oxo-species or pentacoordinated Co2+. However, as the cobalt content of the samples increased, a larger amount was exposed on the surface. This effect levelled off at 9 wt.% Co, after which the increase in exposed Co2+ sites was countered by the masking effect of islands of MgO. In addition, at high cobalt loadings (9 and 12 wt.%) Co formed small clusters which showed bulk CoO-like behaviour. Consequently, the benefit of having surface Co2+ species was balanced by the clustering effect of these species and the presence of MgO islands, negating their contribution to the overall catalytic activity of the samples.
Fil: Ulla, Maria Alicia del H.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; Argentina
Fil: Spretz, R.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; Argentina
Fil: Lombardo, Eduardo Agustin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; Argentina
Fil: Daniell, W.. Ludwig Maximilians Universitat; Alemania
Fil: Knözinger, H.. Ludwig Maximilians Universitat; Alemania
Materia
Cobalt
Magnesium Oxide
Coo-Mgo Solid Solution
Methane Combustion
Co Adsorption
Ftir 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:11336/40124
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/40124
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Catalytic combustion of methane on Co/MgO: characterisation of active cobalt sitesUlla, Maria Alicia del H.Spretz, R.Lombardo, Eduardo AgustinDaniell, W.Knözinger, H.CobaltMagnesium OxideCoo-Mgo Solid SolutionMethane CombustionCo AdsorptionFtir Spectroscopyhttps://purl.org/becyt/ford/2.4https://purl.org/becyt/ford/2A series of Co/MgO catalysts with 3–12 wt.% Co were prepared by impregnation and calcined at 1073 K for 10 h. The catalytic behaviour of these samples toward CH4 combustion was found to increase with cobalt loading, though a plateau was reached at ca. 9 wt.% Co content. Bulk characterisation was carried out using XRD, TPR and Raman spectroscopy, and showed that the solids were made up of a CoO–MgO solid solution and a MgO phase. A detailed examination of their surfaces was achieved through FTIR spectroscopy of adsorbed CO probe molecules, which indicated that at low cobalt loadings only a small proportion of the Co going into the solid solution was present on exposed faces as either Co2+ oxo-species or pentacoordinated Co2+. However, as the cobalt content of the samples increased, a larger amount was exposed on the surface. This effect levelled off at 9 wt.% Co, after which the increase in exposed Co2+ sites was countered by the masking effect of islands of MgO. In addition, at high cobalt loadings (9 and 12 wt.%) Co formed small clusters which showed bulk CoO-like behaviour. Consequently, the benefit of having surface Co2+ species was balanced by the clustering effect of these species and the presence of MgO islands, negating their contribution to the overall catalytic activity of the samples.Fil: Ulla, Maria Alicia del H.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; ArgentinaFil: Spretz, R.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; ArgentinaFil: Lombardo, Eduardo Agustin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; ArgentinaFil: Daniell, W.. Ludwig Maximilians Universitat; AlemaniaFil: Knözinger, H.. Ludwig Maximilians Universitat; AlemaniaElsevier Science2001-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/40124Ulla, Maria Alicia del H.; Spretz, R.; Lombardo, Eduardo Agustin; Daniell, W.; Knözinger, H.; Catalytic combustion of methane on Co/MgO: characterisation of active cobalt sites; Elsevier Science; Applied Catalysis B: Environmental; 29; 3; 2-2001; 217-2290926-3373CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/S0926-3373(00)00204-6info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0926337300002046info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:50:51Zoai:ri.conicet.gov.ar:11336/40124instacron: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 09:50:51.397CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Catalytic combustion of methane on Co/MgO: characterisation of active cobalt sites
title Catalytic combustion of methane on Co/MgO: characterisation of active cobalt sites
spellingShingle Catalytic combustion of methane on Co/MgO: characterisation of active cobalt sites
Ulla, Maria Alicia del H.
Cobalt
Magnesium Oxide
Coo-Mgo Solid Solution
Methane Combustion
Co Adsorption
Ftir Spectroscopy
title_short Catalytic combustion of methane on Co/MgO: characterisation of active cobalt sites
title_full Catalytic combustion of methane on Co/MgO: characterisation of active cobalt sites
title_fullStr Catalytic combustion of methane on Co/MgO: characterisation of active cobalt sites
title_full_unstemmed Catalytic combustion of methane on Co/MgO: characterisation of active cobalt sites
title_sort Catalytic combustion of methane on Co/MgO: characterisation of active cobalt sites
dc.creator.none.fl_str_mv Ulla, Maria Alicia del H.
Spretz, R.
Lombardo, Eduardo Agustin
Daniell, W.
Knözinger, H.
author Ulla, Maria Alicia del H.
author_facet Ulla, Maria Alicia del H.
Spretz, R.
Lombardo, Eduardo Agustin
Daniell, W.
Knözinger, H.
author_role author
author2 Spretz, R.
Lombardo, Eduardo Agustin
Daniell, W.
Knözinger, H.
author2_role author
author
author
author
dc.subject.none.fl_str_mv Cobalt
Magnesium Oxide
Coo-Mgo Solid Solution
Methane Combustion
Co Adsorption
Ftir Spectroscopy
topic Cobalt
Magnesium Oxide
Coo-Mgo Solid Solution
Methane Combustion
Co Adsorption
Ftir Spectroscopy
purl_subject.fl_str_mv https://purl.org/becyt/ford/2.4
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv A series of Co/MgO catalysts with 3–12 wt.% Co were prepared by impregnation and calcined at 1073 K for 10 h. The catalytic behaviour of these samples toward CH4 combustion was found to increase with cobalt loading, though a plateau was reached at ca. 9 wt.% Co content. Bulk characterisation was carried out using XRD, TPR and Raman spectroscopy, and showed that the solids were made up of a CoO–MgO solid solution and a MgO phase. A detailed examination of their surfaces was achieved through FTIR spectroscopy of adsorbed CO probe molecules, which indicated that at low cobalt loadings only a small proportion of the Co going into the solid solution was present on exposed faces as either Co2+ oxo-species or pentacoordinated Co2+. However, as the cobalt content of the samples increased, a larger amount was exposed on the surface. This effect levelled off at 9 wt.% Co, after which the increase in exposed Co2+ sites was countered by the masking effect of islands of MgO. In addition, at high cobalt loadings (9 and 12 wt.%) Co formed small clusters which showed bulk CoO-like behaviour. Consequently, the benefit of having surface Co2+ species was balanced by the clustering effect of these species and the presence of MgO islands, negating their contribution to the overall catalytic activity of the samples.
Fil: Ulla, Maria Alicia del H.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; Argentina
Fil: Spretz, R.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; Argentina
Fil: Lombardo, Eduardo Agustin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; Argentina
Fil: Daniell, W.. Ludwig Maximilians Universitat; Alemania
Fil: Knözinger, H.. Ludwig Maximilians Universitat; Alemania
description A series of Co/MgO catalysts with 3–12 wt.% Co were prepared by impregnation and calcined at 1073 K for 10 h. The catalytic behaviour of these samples toward CH4 combustion was found to increase with cobalt loading, though a plateau was reached at ca. 9 wt.% Co content. Bulk characterisation was carried out using XRD, TPR and Raman spectroscopy, and showed that the solids were made up of a CoO–MgO solid solution and a MgO phase. A detailed examination of their surfaces was achieved through FTIR spectroscopy of adsorbed CO probe molecules, which indicated that at low cobalt loadings only a small proportion of the Co going into the solid solution was present on exposed faces as either Co2+ oxo-species or pentacoordinated Co2+. However, as the cobalt content of the samples increased, a larger amount was exposed on the surface. This effect levelled off at 9 wt.% Co, after which the increase in exposed Co2+ sites was countered by the masking effect of islands of MgO. In addition, at high cobalt loadings (9 and 12 wt.%) Co formed small clusters which showed bulk CoO-like behaviour. Consequently, the benefit of having surface Co2+ species was balanced by the clustering effect of these species and the presence of MgO islands, negating their contribution to the overall catalytic activity of the samples.
publishDate 2001
dc.date.none.fl_str_mv 2001-02
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/11336/40124
Ulla, Maria Alicia del H.; Spretz, R.; Lombardo, Eduardo Agustin; Daniell, W.; Knözinger, H.; Catalytic combustion of methane on Co/MgO: characterisation of active cobalt sites; Elsevier Science; Applied Catalysis B: Environmental; 29; 3; 2-2001; 217-229
0926-3373
CONICET Digital
CONICET
url http://hdl.handle.net/11336/40124
identifier_str_mv Ulla, Maria Alicia del H.; Spretz, R.; Lombardo, Eduardo Agustin; Daniell, W.; Knözinger, H.; Catalytic combustion of methane on Co/MgO: characterisation of active cobalt sites; Elsevier Science; Applied Catalysis B: Environmental; 29; 3; 2-2001; 217-229
0926-3373
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1016/S0926-3373(00)00204-6
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0926337300002046
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
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
dc.publisher.none.fl_str_mv Elsevier Science
publisher.none.fl_str_mv Elsevier Science
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 13.069144

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