Potassium-promoted Ce0.65Zr0.35O2 monolithic catalysts for diesel soot combustion

Autores
Neyertz, Claudia A; Banus, Ezequiel David; Miro, Eduardo Ernesto; Querini, Carlos Alberto
Año de publicación
2014
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
This work presents a comparative study of Ce0.65Zr0.35O2 and CeO2 catalysts supported on cordierite for soot combustion, and the effect of potassium on the catalytic performance. The catalysts were prepared by sequential impregnation over the monolith. The activity in the soot combustion by O2 was studied by successive temperature programmed oxidation cycles, using a loose-contact mode between the soot and the catalyst. A deactivation was observed after ten cycles of combustion for potassium catalysts. This deactivation was attributed to potassium loss at high temperatures. On the other hand, the catalysts without K showed activation after the ten soot combustions. When catalysts with the same cerium molar loading were compared, an improvement in the activity of the mixed oxide compared with the pure ceria was observed. The soot combustion was improved for K/Ce0.65Zr0.35O2/cordierite and K/CeO2/cordierite with NO/O2 presence. However, the catalyst K/CeO2/cordierite was still more active. By X-ray diffraction analyses, it was found that insertion of zirconium into the CeO2 structure took place during preparation. However, a Raman and SEM/EPMA studies indicated heterogeneity in Ce0.65Zr0.35O2. Domains of cerium–zirconium inside the cordierite channel with a ratio different from the nominal value were observed by scanning electron microscopy analyses. This heterogeneity could decrease the catalytic activity of the cerium–zirconium oxide mixture. The catalytic activity in supported catalysts strongly depends on the effect of Zr, the number of Ce4+/Ce3+ redox surface sites, the BET area and the structural changes induced by high temperatures.
Fil: Neyertz, Claudia A. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; Argentina
Fil: Banus, Ezequiel David. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; 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 ; Argentina
Fil: Querini, Carlos Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; Argentina
Materia
Diesel Soot
Cerium
Zirconium
Cordierite
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:11336/31646
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/31646
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Potassium-promoted Ce0.65Zr0.35O2 monolithic catalysts for diesel soot combustionNeyertz, Claudia ABanus, Ezequiel DavidMiro, Eduardo ErnestoQuerini, Carlos AlbertoDiesel SootCeriumZirconiumCordieritehttps://purl.org/becyt/ford/2.4https://purl.org/becyt/ford/2This work presents a comparative study of Ce0.65Zr0.35O2 and CeO2 catalysts supported on cordierite for soot combustion, and the effect of potassium on the catalytic performance. The catalysts were prepared by sequential impregnation over the monolith. The activity in the soot combustion by O2 was studied by successive temperature programmed oxidation cycles, using a loose-contact mode between the soot and the catalyst. A deactivation was observed after ten cycles of combustion for potassium catalysts. This deactivation was attributed to potassium loss at high temperatures. On the other hand, the catalysts without K showed activation after the ten soot combustions. When catalysts with the same cerium molar loading were compared, an improvement in the activity of the mixed oxide compared with the pure ceria was observed. The soot combustion was improved for K/Ce0.65Zr0.35O2/cordierite and K/CeO2/cordierite with NO/O2 presence. However, the catalyst K/CeO2/cordierite was still more active. By X-ray diffraction analyses, it was found that insertion of zirconium into the CeO2 structure took place during preparation. However, a Raman and SEM/EPMA studies indicated heterogeneity in Ce0.65Zr0.35O2. Domains of cerium–zirconium inside the cordierite channel with a ratio different from the nominal value were observed by scanning electron microscopy analyses. This heterogeneity could decrease the catalytic activity of the cerium–zirconium oxide mixture. The catalytic activity in supported catalysts strongly depends on the effect of Zr, the number of Ce4+/Ce3+ redox surface sites, the BET area and the structural changes induced by high temperatures.Fil: Neyertz, Claudia A. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; ArgentinaFil: Banus, Ezequiel David. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; ArgentinaFil: Miro, Eduardo Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; ArgentinaFil: Querini, Carlos Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; ArgentinaElsevier2014-03info: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/11336/31646Banus, Ezequiel David; Miro, Eduardo Ernesto; Neyertz, Claudia A; Querini, Carlos Alberto; Potassium-promoted Ce0.65Zr0.35O2 monolithic catalysts for diesel soot combustion; Elsevier; Chemical Engineering Journal; 248; 3-2014; 394-4051385-8947CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S138589471400326Xinfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.cej.2014.03.048info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:55:21Zoai:ri.conicet.gov.ar:11336/31646instacron: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:34982025-09-03 09:55:21.58CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Potassium-promoted Ce0.65Zr0.35O2 monolithic catalysts for diesel soot combustion
title Potassium-promoted Ce0.65Zr0.35O2 monolithic catalysts for diesel soot combustion
spellingShingle Potassium-promoted Ce0.65Zr0.35O2 monolithic catalysts for diesel soot combustion
Neyertz, Claudia A
Diesel Soot
Cerium
Zirconium
Cordierite
title_short Potassium-promoted Ce0.65Zr0.35O2 monolithic catalysts for diesel soot combustion
title_full Potassium-promoted Ce0.65Zr0.35O2 monolithic catalysts for diesel soot combustion
title_fullStr Potassium-promoted Ce0.65Zr0.35O2 monolithic catalysts for diesel soot combustion
title_full_unstemmed Potassium-promoted Ce0.65Zr0.35O2 monolithic catalysts for diesel soot combustion
title_sort Potassium-promoted Ce0.65Zr0.35O2 monolithic catalysts for diesel soot combustion
dc.creator.none.fl_str_mv Neyertz, Claudia A
Banus, Ezequiel David
Miro, Eduardo Ernesto
Querini, Carlos Alberto
author Neyertz, Claudia A
author_facet Neyertz, Claudia A
Banus, Ezequiel David
Miro, Eduardo Ernesto
Querini, Carlos Alberto
author_role author
author2 Banus, Ezequiel David
Miro, Eduardo Ernesto
Querini, Carlos Alberto
author2_role author
author
author
dc.subject.none.fl_str_mv Diesel Soot
Cerium
Zirconium
Cordierite
topic Diesel Soot
Cerium
Zirconium
Cordierite
purl_subject.fl_str_mv https://purl.org/becyt/ford/2.4
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv This work presents a comparative study of Ce0.65Zr0.35O2 and CeO2 catalysts supported on cordierite for soot combustion, and the effect of potassium on the catalytic performance. The catalysts were prepared by sequential impregnation over the monolith. The activity in the soot combustion by O2 was studied by successive temperature programmed oxidation cycles, using a loose-contact mode between the soot and the catalyst. A deactivation was observed after ten cycles of combustion for potassium catalysts. This deactivation was attributed to potassium loss at high temperatures. On the other hand, the catalysts without K showed activation after the ten soot combustions. When catalysts with the same cerium molar loading were compared, an improvement in the activity of the mixed oxide compared with the pure ceria was observed. The soot combustion was improved for K/Ce0.65Zr0.35O2/cordierite and K/CeO2/cordierite with NO/O2 presence. However, the catalyst K/CeO2/cordierite was still more active. By X-ray diffraction analyses, it was found that insertion of zirconium into the CeO2 structure took place during preparation. However, a Raman and SEM/EPMA studies indicated heterogeneity in Ce0.65Zr0.35O2. Domains of cerium–zirconium inside the cordierite channel with a ratio different from the nominal value were observed by scanning electron microscopy analyses. This heterogeneity could decrease the catalytic activity of the cerium–zirconium oxide mixture. The catalytic activity in supported catalysts strongly depends on the effect of Zr, the number of Ce4+/Ce3+ redox surface sites, the BET area and the structural changes induced by high temperatures.
Fil: Neyertz, Claudia A. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; Argentina
Fil: Banus, Ezequiel David. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; 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 ; Argentina
Fil: Querini, Carlos Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; Argentina
description This work presents a comparative study of Ce0.65Zr0.35O2 and CeO2 catalysts supported on cordierite for soot combustion, and the effect of potassium on the catalytic performance. The catalysts were prepared by sequential impregnation over the monolith. The activity in the soot combustion by O2 was studied by successive temperature programmed oxidation cycles, using a loose-contact mode between the soot and the catalyst. A deactivation was observed after ten cycles of combustion for potassium catalysts. This deactivation was attributed to potassium loss at high temperatures. On the other hand, the catalysts without K showed activation after the ten soot combustions. When catalysts with the same cerium molar loading were compared, an improvement in the activity of the mixed oxide compared with the pure ceria was observed. The soot combustion was improved for K/Ce0.65Zr0.35O2/cordierite and K/CeO2/cordierite with NO/O2 presence. However, the catalyst K/CeO2/cordierite was still more active. By X-ray diffraction analyses, it was found that insertion of zirconium into the CeO2 structure took place during preparation. However, a Raman and SEM/EPMA studies indicated heterogeneity in Ce0.65Zr0.35O2. Domains of cerium–zirconium inside the cordierite channel with a ratio different from the nominal value were observed by scanning electron microscopy analyses. This heterogeneity could decrease the catalytic activity of the cerium–zirconium oxide mixture. The catalytic activity in supported catalysts strongly depends on the effect of Zr, the number of Ce4+/Ce3+ redox surface sites, the BET area and the structural changes induced by high temperatures.
publishDate 2014
dc.date.none.fl_str_mv 2014-03
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/11336/31646
Banus, Ezequiel David; Miro, Eduardo Ernesto; Neyertz, Claudia A; Querini, Carlos Alberto; Potassium-promoted Ce0.65Zr0.35O2 monolithic catalysts for diesel soot combustion; Elsevier; Chemical Engineering Journal; 248; 3-2014; 394-405
1385-8947
CONICET Digital
CONICET
url http://hdl.handle.net/11336/31646
identifier_str_mv Banus, Ezequiel David; Miro, Eduardo Ernesto; Neyertz, Claudia A; Querini, Carlos Alberto; Potassium-promoted Ce0.65Zr0.35O2 monolithic catalysts for diesel soot combustion; Elsevier; Chemical Engineering Journal; 248; 3-2014; 394-405
1385-8947
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://www.sciencedirect.com/science/article/pii/S138589471400326X
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.cej.2014.03.048
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
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 13.13397

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