Surface characterization and dehydrocyclization activity of Pt/KL catalysts prepared by different methods

Autores
Arcoya, Adolfo; Seoane, Xosé Lois; Grau, Javier Mario
Año de publicación
2003
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Three Pt/KL-zeolite catalysts containing 1 wt.% of metal were prepared by different procedures: CI-1 and CI-2 by wetness impregnation of the zeolite with aqueous solutions of Pt(NH3)4(OH)2 and Pt(NH3)4(NO3)2, respectively, and CE-3 by ion exchange with a Pt(NH3)4(OH)2 solution. These samples were successively calcined at 573 K and reduced at 773 K. An additional sample, CE-3-n, was obtained from CE-3 by ion-exchange with KNO3. The catalysts were characterized by H2–O2 titration, TPD of NH3, XRD, CO–FTIR and XPS and tested in the dehydrocyclization of n-heptane to toluene at 723 K, 100 kPa, WHSV=3.4 h−1 and H2/nC7=7.3 mol mol−1 in a fixed bed tubular reactor. Characterization results show that Pt dispersion for the ion exchanged samples is higher than for the impregnated ones and CE-3 is the more acidic catalyst. FTIR measurements indicate that the highest population of electron reach platinum species (Ptδ−) is found in CE-3-n, while CE-3 exhibits the highest concentration of electron deficient platinum species (Ptδ+). The order of dehydrocyclization activity, CE-3-n>CI-2>CI-1>CE-3, roughly correlates with that of the intensity of the FTIR bands attributed to Ptδ−. The low selectivity toward toluene of CE-3 is attributed to the protons generated during the reduction of Pt2+ exchanged.
Fil: Arcoya, Adolfo. Instituto de Catálisis y Petroleoquı́mica (CSIC); España
Fil: Seoane, Xosé Lois. Instituto de Catálisis y Petroleoquı́mica (CSIC); España
Fil: Grau, Javier Mario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; Argentina
Materia
Ftir
Xps
Pt/Kl Catalysts
Dehydrocyclization
Toluene
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:11336/39277
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/39277
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Surface characterization and dehydrocyclization activity of Pt/KL catalysts prepared by different methodsArcoya, AdolfoSeoane, Xosé LoisGrau, Javier MarioFtirXpsPt/Kl CatalystsDehydrocyclizationToluenehttps://purl.org/becyt/ford/2.4https://purl.org/becyt/ford/2Three Pt/KL-zeolite catalysts containing 1 wt.% of metal were prepared by different procedures: CI-1 and CI-2 by wetness impregnation of the zeolite with aqueous solutions of Pt(NH3)4(OH)2 and Pt(NH3)4(NO3)2, respectively, and CE-3 by ion exchange with a Pt(NH3)4(OH)2 solution. These samples were successively calcined at 573 K and reduced at 773 K. An additional sample, CE-3-n, was obtained from CE-3 by ion-exchange with KNO3. The catalysts were characterized by H2–O2 titration, TPD of NH3, XRD, CO–FTIR and XPS and tested in the dehydrocyclization of n-heptane to toluene at 723 K, 100 kPa, WHSV=3.4 h−1 and H2/nC7=7.3 mol mol−1 in a fixed bed tubular reactor. Characterization results show that Pt dispersion for the ion exchanged samples is higher than for the impregnated ones and CE-3 is the more acidic catalyst. FTIR measurements indicate that the highest population of electron reach platinum species (Ptδ−) is found in CE-3-n, while CE-3 exhibits the highest concentration of electron deficient platinum species (Ptδ+). The order of dehydrocyclization activity, CE-3-n>CI-2>CI-1>CE-3, roughly correlates with that of the intensity of the FTIR bands attributed to Ptδ−. The low selectivity toward toluene of CE-3 is attributed to the protons generated during the reduction of Pt2+ exchanged.Fil: Arcoya, Adolfo. Instituto de Catálisis y Petroleoquı́mica (CSIC); EspañaFil: Seoane, Xosé Lois. Instituto de Catálisis y Petroleoquı́mica (CSIC); EspañaFil: Grau, Javier Mario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; ArgentinaElsevier Science2003-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/39277Arcoya, Adolfo; Seoane, Xosé Lois; Grau, Javier Mario; Surface characterization and dehydrocyclization activity of Pt/KL catalysts prepared by different methods; Elsevier Science; Applied Surface Science; 205; 1-4; 1-2003; 206-2110169-4332CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/S0169-4332(02)01089-9info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0169433202010899info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:45:48Zoai:ri.conicet.gov.ar:11336/39277instacron: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 10:45:48.769CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Surface characterization and dehydrocyclization activity of Pt/KL catalysts prepared by different methods
title Surface characterization and dehydrocyclization activity of Pt/KL catalysts prepared by different methods
spellingShingle Surface characterization and dehydrocyclization activity of Pt/KL catalysts prepared by different methods
Arcoya, Adolfo
Ftir
Xps
Pt/Kl Catalysts
Dehydrocyclization
Toluene
title_short Surface characterization and dehydrocyclization activity of Pt/KL catalysts prepared by different methods
title_full Surface characterization and dehydrocyclization activity of Pt/KL catalysts prepared by different methods
title_fullStr Surface characterization and dehydrocyclization activity of Pt/KL catalysts prepared by different methods
title_full_unstemmed Surface characterization and dehydrocyclization activity of Pt/KL catalysts prepared by different methods
title_sort Surface characterization and dehydrocyclization activity of Pt/KL catalysts prepared by different methods
dc.creator.none.fl_str_mv Arcoya, Adolfo
Seoane, Xosé Lois
Grau, Javier Mario
author Arcoya, Adolfo
author_facet Arcoya, Adolfo
Seoane, Xosé Lois
Grau, Javier Mario
author_role author
author2 Seoane, Xosé Lois
Grau, Javier Mario
author2_role author
author
dc.subject.none.fl_str_mv Ftir
Xps
Pt/Kl Catalysts
Dehydrocyclization
Toluene
topic Ftir
Xps
Pt/Kl Catalysts
Dehydrocyclization
Toluene
purl_subject.fl_str_mv https://purl.org/becyt/ford/2.4
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv Three Pt/KL-zeolite catalysts containing 1 wt.% of metal were prepared by different procedures: CI-1 and CI-2 by wetness impregnation of the zeolite with aqueous solutions of Pt(NH3)4(OH)2 and Pt(NH3)4(NO3)2, respectively, and CE-3 by ion exchange with a Pt(NH3)4(OH)2 solution. These samples were successively calcined at 573 K and reduced at 773 K. An additional sample, CE-3-n, was obtained from CE-3 by ion-exchange with KNO3. The catalysts were characterized by H2–O2 titration, TPD of NH3, XRD, CO–FTIR and XPS and tested in the dehydrocyclization of n-heptane to toluene at 723 K, 100 kPa, WHSV=3.4 h−1 and H2/nC7=7.3 mol mol−1 in a fixed bed tubular reactor. Characterization results show that Pt dispersion for the ion exchanged samples is higher than for the impregnated ones and CE-3 is the more acidic catalyst. FTIR measurements indicate that the highest population of electron reach platinum species (Ptδ−) is found in CE-3-n, while CE-3 exhibits the highest concentration of electron deficient platinum species (Ptδ+). The order of dehydrocyclization activity, CE-3-n>CI-2>CI-1>CE-3, roughly correlates with that of the intensity of the FTIR bands attributed to Ptδ−. The low selectivity toward toluene of CE-3 is attributed to the protons generated during the reduction of Pt2+ exchanged.
Fil: Arcoya, Adolfo. Instituto de Catálisis y Petroleoquı́mica (CSIC); España
Fil: Seoane, Xosé Lois. Instituto de Catálisis y Petroleoquı́mica (CSIC); España
Fil: Grau, Javier Mario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica ; Argentina
description Three Pt/KL-zeolite catalysts containing 1 wt.% of metal were prepared by different procedures: CI-1 and CI-2 by wetness impregnation of the zeolite with aqueous solutions of Pt(NH3)4(OH)2 and Pt(NH3)4(NO3)2, respectively, and CE-3 by ion exchange with a Pt(NH3)4(OH)2 solution. These samples were successively calcined at 573 K and reduced at 773 K. An additional sample, CE-3-n, was obtained from CE-3 by ion-exchange with KNO3. The catalysts were characterized by H2–O2 titration, TPD of NH3, XRD, CO–FTIR and XPS and tested in the dehydrocyclization of n-heptane to toluene at 723 K, 100 kPa, WHSV=3.4 h−1 and H2/nC7=7.3 mol mol−1 in a fixed bed tubular reactor. Characterization results show that Pt dispersion for the ion exchanged samples is higher than for the impregnated ones and CE-3 is the more acidic catalyst. FTIR measurements indicate that the highest population of electron reach platinum species (Ptδ−) is found in CE-3-n, while CE-3 exhibits the highest concentration of electron deficient platinum species (Ptδ+). The order of dehydrocyclization activity, CE-3-n>CI-2>CI-1>CE-3, roughly correlates with that of the intensity of the FTIR bands attributed to Ptδ−. The low selectivity toward toluene of CE-3 is attributed to the protons generated during the reduction of Pt2+ exchanged.
publishDate 2003
dc.date.none.fl_str_mv 2003-01
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/11336/39277
Arcoya, Adolfo; Seoane, Xosé Lois; Grau, Javier Mario; Surface characterization and dehydrocyclization activity of Pt/KL catalysts prepared by different methods; Elsevier Science; Applied Surface Science; 205; 1-4; 1-2003; 206-211
0169-4332
CONICET Digital
CONICET
url http://hdl.handle.net/11336/39277
identifier_str_mv Arcoya, Adolfo; Seoane, Xosé Lois; Grau, Javier Mario; Surface characterization and dehydrocyclization activity of Pt/KL catalysts prepared by different methods; Elsevier Science; Applied Surface Science; 205; 1-4; 1-2003; 206-211
0169-4332
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/S0169-4332(02)01089-9
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0169433202010899
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 13.070432

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