Differences in coke burning-off from Pt-Sn/Al2O3 catalyst with oxygen or ozone

Autores
Pieck, Carlos Luis; Vera, Carlos Roman; Querini, Carlos Alberto; Parera, Jose
Año de publicación
2005
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Pt-Sn/γ-Al2O3 catalysts with different Sn loadings were prepared by incipient wetness coimpregnation of γ-Al2O3 with H2PtCl 6 and SnCl2. The Pt-Sn interaction was tested by temperature- programmed reduction and the catalytic activity was measured by cyclohexane dehydrogenation. The catalysts were coked by cyclopentane at 500 °C and totally or partially decoked with O2 at 450 °C or O3 at 125 °C. Coke deposits were studied by TPO and the catalytic activity of coked catalysts, partially or totally regenerated, by cyclohexane dehydrogenation. The TPO with O3 shows that coke combustion with O3 starts at a low temperature and has a maximum at 150 °C, that is a compensation between the increase of the burning rate and the rate of O3 decomposition when increasing the temperature. Meanwhile O2 burns coke with a maximum at 500 °C. When performing partial decoking with O3 (125 °C) the remaining coke is more oxygenated and easier to burn than the coke that remains after decoking with O2 (450 °C). After burning with O3 the dehydrogenation activity of the fresh catalyst is recovered, while after burning with O2 the activity is higher than that of the fresh catalyst. The burning with O3 practically does not change the original Pt-Sn interaction while the burning with O2 produces a decrease in the interaction, producing free Pt sites with higher dehydrogenation capacity. The differences in coke combustion with O3 and O2 are due to the different form of generation of activated oxygen, the species that oxidizes the coke. O3 is activated by the γ-Al2O3 support at low temperatures firstly eliminating coke from the support while O2 is activated by Pt at temperatures higher than 450 °C and the coke removal starts on the metal. Then, the recovery of the Pt catalytic activity as a function of coke elimination is faster with O2 than with O3.
Fil: Pieck, Carlos Luis. 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: Vera, Carlos Roman. 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: Querini, Carlos Alberto. 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: Parera, Jose. 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
Materia
Coke Tpo
O3 Versus O2 Decoking
Pt-Sn Interaction
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:11336/73024
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/73024
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Differences in coke burning-off from Pt-Sn/Al2O3 catalyst with oxygen or ozonePieck, Carlos LuisVera, Carlos RomanQuerini, Carlos AlbertoParera, JoseCoke TpoO3 Versus O2 DecokingPt-Sn Interactionhttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1Pt-Sn/γ-Al2O3 catalysts with different Sn loadings were prepared by incipient wetness coimpregnation of γ-Al2O3 with H2PtCl 6 and SnCl2. The Pt-Sn interaction was tested by temperature- programmed reduction and the catalytic activity was measured by cyclohexane dehydrogenation. The catalysts were coked by cyclopentane at 500 °C and totally or partially decoked with O2 at 450 °C or O3 at 125 °C. Coke deposits were studied by TPO and the catalytic activity of coked catalysts, partially or totally regenerated, by cyclohexane dehydrogenation. The TPO with O3 shows that coke combustion with O3 starts at a low temperature and has a maximum at 150 °C, that is a compensation between the increase of the burning rate and the rate of O3 decomposition when increasing the temperature. Meanwhile O2 burns coke with a maximum at 500 °C. When performing partial decoking with O3 (125 °C) the remaining coke is more oxygenated and easier to burn than the coke that remains after decoking with O2 (450 °C). After burning with O3 the dehydrogenation activity of the fresh catalyst is recovered, while after burning with O2 the activity is higher than that of the fresh catalyst. The burning with O3 practically does not change the original Pt-Sn interaction while the burning with O2 produces a decrease in the interaction, producing free Pt sites with higher dehydrogenation capacity. The differences in coke combustion with O3 and O2 are due to the different form of generation of activated oxygen, the species that oxidizes the coke. O3 is activated by the γ-Al2O3 support at low temperatures firstly eliminating coke from the support while O2 is activated by Pt at temperatures higher than 450 °C and the coke removal starts on the metal. Then, the recovery of the Pt catalytic activity as a function of coke elimination is faster with O2 than with O3.Fil: Pieck, Carlos Luis. 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: Vera, Carlos Roman. 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: Querini, Carlos Alberto. 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: Parera, Jose. 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"; ArgentinaElsevier Science2005-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/73024Pieck, Carlos Luis; Vera, Carlos Roman; Querini, Carlos Alberto; Parera, Jose; Differences in coke burning-off from Pt-Sn/Al2O3 catalyst with oxygen or ozone; Elsevier Science; Applied Catalysis A: General; 278; 2; 1-2005; 173-1800926-860XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.apcata.2004.05.001info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:06:15Zoai:ri.conicet.gov.ar:11336/73024instacron: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 10:06:15.919CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Differences in coke burning-off from Pt-Sn/Al2O3 catalyst with oxygen or ozone
title Differences in coke burning-off from Pt-Sn/Al2O3 catalyst with oxygen or ozone
spellingShingle Differences in coke burning-off from Pt-Sn/Al2O3 catalyst with oxygen or ozone
Pieck, Carlos Luis
Coke Tpo
O3 Versus O2 Decoking
Pt-Sn Interaction
title_short Differences in coke burning-off from Pt-Sn/Al2O3 catalyst with oxygen or ozone
title_full Differences in coke burning-off from Pt-Sn/Al2O3 catalyst with oxygen or ozone
title_fullStr Differences in coke burning-off from Pt-Sn/Al2O3 catalyst with oxygen or ozone
title_full_unstemmed Differences in coke burning-off from Pt-Sn/Al2O3 catalyst with oxygen or ozone
title_sort Differences in coke burning-off from Pt-Sn/Al2O3 catalyst with oxygen or ozone
dc.creator.none.fl_str_mv Pieck, Carlos Luis
Vera, Carlos Roman
Querini, Carlos Alberto
Parera, Jose
author Pieck, Carlos Luis
author_facet Pieck, Carlos Luis
Vera, Carlos Roman
Querini, Carlos Alberto
Parera, Jose
author_role author
author2 Vera, Carlos Roman
Querini, Carlos Alberto
Parera, Jose
author2_role author
author
author
dc.subject.none.fl_str_mv Coke Tpo
O3 Versus O2 Decoking
Pt-Sn Interaction
topic Coke Tpo
O3 Versus O2 Decoking
Pt-Sn Interaction
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Pt-Sn/γ-Al2O3 catalysts with different Sn loadings were prepared by incipient wetness coimpregnation of γ-Al2O3 with H2PtCl 6 and SnCl2. The Pt-Sn interaction was tested by temperature- programmed reduction and the catalytic activity was measured by cyclohexane dehydrogenation. The catalysts were coked by cyclopentane at 500 °C and totally or partially decoked with O2 at 450 °C or O3 at 125 °C. Coke deposits were studied by TPO and the catalytic activity of coked catalysts, partially or totally regenerated, by cyclohexane dehydrogenation. The TPO with O3 shows that coke combustion with O3 starts at a low temperature and has a maximum at 150 °C, that is a compensation between the increase of the burning rate and the rate of O3 decomposition when increasing the temperature. Meanwhile O2 burns coke with a maximum at 500 °C. When performing partial decoking with O3 (125 °C) the remaining coke is more oxygenated and easier to burn than the coke that remains after decoking with O2 (450 °C). After burning with O3 the dehydrogenation activity of the fresh catalyst is recovered, while after burning with O2 the activity is higher than that of the fresh catalyst. The burning with O3 practically does not change the original Pt-Sn interaction while the burning with O2 produces a decrease in the interaction, producing free Pt sites with higher dehydrogenation capacity. The differences in coke combustion with O3 and O2 are due to the different form of generation of activated oxygen, the species that oxidizes the coke. O3 is activated by the γ-Al2O3 support at low temperatures firstly eliminating coke from the support while O2 is activated by Pt at temperatures higher than 450 °C and the coke removal starts on the metal. Then, the recovery of the Pt catalytic activity as a function of coke elimination is faster with O2 than with O3.
Fil: Pieck, Carlos Luis. 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: Vera, Carlos Roman. 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: Querini, Carlos Alberto. 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: Parera, Jose. 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
description Pt-Sn/γ-Al2O3 catalysts with different Sn loadings were prepared by incipient wetness coimpregnation of γ-Al2O3 with H2PtCl 6 and SnCl2. The Pt-Sn interaction was tested by temperature- programmed reduction and the catalytic activity was measured by cyclohexane dehydrogenation. The catalysts were coked by cyclopentane at 500 °C and totally or partially decoked with O2 at 450 °C or O3 at 125 °C. Coke deposits were studied by TPO and the catalytic activity of coked catalysts, partially or totally regenerated, by cyclohexane dehydrogenation. The TPO with O3 shows that coke combustion with O3 starts at a low temperature and has a maximum at 150 °C, that is a compensation between the increase of the burning rate and the rate of O3 decomposition when increasing the temperature. Meanwhile O2 burns coke with a maximum at 500 °C. When performing partial decoking with O3 (125 °C) the remaining coke is more oxygenated and easier to burn than the coke that remains after decoking with O2 (450 °C). After burning with O3 the dehydrogenation activity of the fresh catalyst is recovered, while after burning with O2 the activity is higher than that of the fresh catalyst. The burning with O3 practically does not change the original Pt-Sn interaction while the burning with O2 produces a decrease in the interaction, producing free Pt sites with higher dehydrogenation capacity. The differences in coke combustion with O3 and O2 are due to the different form of generation of activated oxygen, the species that oxidizes the coke. O3 is activated by the γ-Al2O3 support at low temperatures firstly eliminating coke from the support while O2 is activated by Pt at temperatures higher than 450 °C and the coke removal starts on the metal. Then, the recovery of the Pt catalytic activity as a function of coke elimination is faster with O2 than with O3.
publishDate 2005
dc.date.none.fl_str_mv 2005-01
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/11336/73024
Pieck, Carlos Luis; Vera, Carlos Roman; Querini, Carlos Alberto; Parera, Jose; Differences in coke burning-off from Pt-Sn/Al2O3 catalyst with oxygen or ozone; Elsevier Science; Applied Catalysis A: General; 278; 2; 1-2005; 173-180
0926-860X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/73024
identifier_str_mv Pieck, Carlos Luis; Vera, Carlos Roman; Querini, Carlos Alberto; Parera, Jose; Differences in coke burning-off from Pt-Sn/Al2O3 catalyst with oxygen or ozone; Elsevier Science; Applied Catalysis A: General; 278; 2; 1-2005; 173-180
0926-860X
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.apcata.2004.05.001
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
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 13.070432

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