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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/40124
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oai:ri.conicet.gov.ar:11336/40124 |
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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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1844613566909382656 |
score |
13.069144 |