Spectroscopic and catalytic characterization of Co-exchanged mordenites subject to CO/O2 redox treatments
- Autores
- Gutierrez, Laura Beatriz; Miro, Eduardo Ernesto; Irusta, S.
- Año de publicación
- 2008
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Co-mordenites were prepared by ion exchange and wet impregnation over Na-mordenite and H-mordenite. The prepared solids were calcined and aliquots of these samples were subject to redox treatments first with CO for 2 h at 773 K and then kept 2 h at the same temperature in flowing O2. A thorough characterization of the solids was carried out by TPR, XPS, CO volumetric adsorption, and FTIR with CO, NO and pyridine adsorption as probe molecules. After the redox treatment, Na based samples showed an important increase in the CO adsorption. TPR and XPS results indicated reduction of the oxides present in the calcined samples and the migration of exchanged cobalt from hidden to more exposed sites was demonstrated by FTIR. The acid catalysts did not change their CO capacity of adsorption; exchanged cobalt ions were mainly in β-type sites and remained in this position after treatment. After the redox treatments, the activity for the selective reduction of NOx with methane suffered a decrease on both types of mordenites, probably caused by the strong adsorption of NO and the reduction of β-type Co2+ to metallic cobalt that would diminish the active sites concentration and also block the channels, thus preventing the access of the reactants.
Fil: Gutierrez, Laura Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera"; Argentina
Fil: Miro, Eduardo Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera"; Argentina
Fil: Irusta, S.. Universidad de Zaragoza; España - Materia
-
Co-Mordenites
Co-Ftir
No-Ftir
Py-Ftir - 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:11336/65154
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Spectroscopic and catalytic characterization of Co-exchanged mordenites subject to CO/O2 redox treatmentsGutierrez, Laura BeatrizMiro, Eduardo ErnestoIrusta, S.Co-MordenitesCo-FtirNo-FtirPy-Ftirhttps://purl.org/becyt/ford/2.4https://purl.org/becyt/ford/2Co-mordenites were prepared by ion exchange and wet impregnation over Na-mordenite and H-mordenite. The prepared solids were calcined and aliquots of these samples were subject to redox treatments first with CO for 2 h at 773 K and then kept 2 h at the same temperature in flowing O2. A thorough characterization of the solids was carried out by TPR, XPS, CO volumetric adsorption, and FTIR with CO, NO and pyridine adsorption as probe molecules. After the redox treatment, Na based samples showed an important increase in the CO adsorption. TPR and XPS results indicated reduction of the oxides present in the calcined samples and the migration of exchanged cobalt from hidden to more exposed sites was demonstrated by FTIR. The acid catalysts did not change their CO capacity of adsorption; exchanged cobalt ions were mainly in β-type sites and remained in this position after treatment. After the redox treatments, the activity for the selective reduction of NOx with methane suffered a decrease on both types of mordenites, probably caused by the strong adsorption of NO and the reduction of β-type Co2+ to metallic cobalt that would diminish the active sites concentration and also block the channels, thus preventing the access of the reactants.Fil: Gutierrez, Laura Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera"; ArgentinaFil: Miro, Eduardo Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera"; ArgentinaFil: Irusta, S.. Universidad de Zaragoza; EspañaElsevier Science2008-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/65154Gutierrez, Laura Beatriz; Miro, Eduardo Ernesto; Irusta, S.; Spectroscopic and catalytic characterization of Co-exchanged mordenites subject to CO/O2 redox treatments; Elsevier Science; Microporous and Mesoporous Materials; 114; 1-3; 9-2008; 281-2921387-1811CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.micromeso.2008.01.014info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:07:03Zoai:ri.conicet.gov.ar:11336/65154instacron: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 10:07:03.345CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Spectroscopic and catalytic characterization of Co-exchanged mordenites subject to CO/O2 redox treatments |
title |
Spectroscopic and catalytic characterization of Co-exchanged mordenites subject to CO/O2 redox treatments |
spellingShingle |
Spectroscopic and catalytic characterization of Co-exchanged mordenites subject to CO/O2 redox treatments Gutierrez, Laura Beatriz Co-Mordenites Co-Ftir No-Ftir Py-Ftir |
title_short |
Spectroscopic and catalytic characterization of Co-exchanged mordenites subject to CO/O2 redox treatments |
title_full |
Spectroscopic and catalytic characterization of Co-exchanged mordenites subject to CO/O2 redox treatments |
title_fullStr |
Spectroscopic and catalytic characterization of Co-exchanged mordenites subject to CO/O2 redox treatments |
title_full_unstemmed |
Spectroscopic and catalytic characterization of Co-exchanged mordenites subject to CO/O2 redox treatments |
title_sort |
Spectroscopic and catalytic characterization of Co-exchanged mordenites subject to CO/O2 redox treatments |
dc.creator.none.fl_str_mv |
Gutierrez, Laura Beatriz Miro, Eduardo Ernesto Irusta, S. |
author |
Gutierrez, Laura Beatriz |
author_facet |
Gutierrez, Laura Beatriz Miro, Eduardo Ernesto Irusta, S. |
author_role |
author |
author2 |
Miro, Eduardo Ernesto Irusta, S. |
author2_role |
author author |
dc.subject.none.fl_str_mv |
Co-Mordenites Co-Ftir No-Ftir Py-Ftir |
topic |
Co-Mordenites Co-Ftir No-Ftir Py-Ftir |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/2.4 https://purl.org/becyt/ford/2 |
dc.description.none.fl_txt_mv |
Co-mordenites were prepared by ion exchange and wet impregnation over Na-mordenite and H-mordenite. The prepared solids were calcined and aliquots of these samples were subject to redox treatments first with CO for 2 h at 773 K and then kept 2 h at the same temperature in flowing O2. A thorough characterization of the solids was carried out by TPR, XPS, CO volumetric adsorption, and FTIR with CO, NO and pyridine adsorption as probe molecules. After the redox treatment, Na based samples showed an important increase in the CO adsorption. TPR and XPS results indicated reduction of the oxides present in the calcined samples and the migration of exchanged cobalt from hidden to more exposed sites was demonstrated by FTIR. The acid catalysts did not change their CO capacity of adsorption; exchanged cobalt ions were mainly in β-type sites and remained in this position after treatment. After the redox treatments, the activity for the selective reduction of NOx with methane suffered a decrease on both types of mordenites, probably caused by the strong adsorption of NO and the reduction of β-type Co2+ to metallic cobalt that would diminish the active sites concentration and also block the channels, thus preventing the access of the reactants. Fil: Gutierrez, Laura Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera"; Argentina Fil: Miro, Eduardo Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera"; Argentina Fil: Irusta, S.. Universidad de Zaragoza; España |
description |
Co-mordenites were prepared by ion exchange and wet impregnation over Na-mordenite and H-mordenite. The prepared solids were calcined and aliquots of these samples were subject to redox treatments first with CO for 2 h at 773 K and then kept 2 h at the same temperature in flowing O2. A thorough characterization of the solids was carried out by TPR, XPS, CO volumetric adsorption, and FTIR with CO, NO and pyridine adsorption as probe molecules. After the redox treatment, Na based samples showed an important increase in the CO adsorption. TPR and XPS results indicated reduction of the oxides present in the calcined samples and the migration of exchanged cobalt from hidden to more exposed sites was demonstrated by FTIR. The acid catalysts did not change their CO capacity of adsorption; exchanged cobalt ions were mainly in β-type sites and remained in this position after treatment. After the redox treatments, the activity for the selective reduction of NOx with methane suffered a decrease on both types of mordenites, probably caused by the strong adsorption of NO and the reduction of β-type Co2+ to metallic cobalt that would diminish the active sites concentration and also block the channels, thus preventing the access of the reactants. |
publishDate |
2008 |
dc.date.none.fl_str_mv |
2008-09 |
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/11336/65154 Gutierrez, Laura Beatriz; Miro, Eduardo Ernesto; Irusta, S.; Spectroscopic and catalytic characterization of Co-exchanged mordenites subject to CO/O2 redox treatments; Elsevier Science; Microporous and Mesoporous Materials; 114; 1-3; 9-2008; 281-292 1387-1811 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/65154 |
identifier_str_mv |
Gutierrez, Laura Beatriz; Miro, Eduardo Ernesto; Irusta, S.; Spectroscopic and catalytic characterization of Co-exchanged mordenites subject to CO/O2 redox treatments; Elsevier Science; Microporous and Mesoporous Materials; 114; 1-3; 9-2008; 281-292 1387-1811 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/j.micromeso.2008.01.014 |
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 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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1844613925618843648 |
score |
13.070432 |