Dehydrocyclization of n-heptane over a PtBa/Kl catalyst: Reaction mechanism
- Autores
- Arcoya, Adolfo; Seoane, Xosé L.; Grau, Javier Mario
- Año de publicación
- 2005
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- The dehydrocyclization of n-heptane to toluene over a 1 wt.% PtBa/KL catalyst was studied in a fixed bed tubular reactor, at 723 K, 100 kPa and space-time in the range of 1.8-117.0 g h mol-1. The catalyst was prepared by incipient wetness impregnation of a KL zeolite, previously alkalized with BaO, using an aqueous solution of tetraammineplatinum(II) hydroxide as platinum precursor. The solid was successively calcined in an oxygen stream and reduced in flowing hydrogen, at 773 K. Reaction is highly selective towards toluene (>60%) at conversion levels even close to 100%, with benzene, heptenes, methylcyclohexane and ethylcyclopentane as major byproducts. From the product distribution and the dehydrocyclization results of the reaction products performed in separate experiments, a macroscopic mechanism is proposed. Essentially, n-heptane is adsorbed and transformed on the catalyst surface through an alkene-like intermediate (σC7=), following five possible parallel interconnected paths, involving hydrogenolysis, isomerization, dehydrogenation and cyclization reactions. Formation of toluene as a primary product is explained by a "rake scheme" in which the σC7= intermediate is successively transformed, following two possible routes: (a) C1-C6 ring closure and subsequent further dehydrogenation; (b) successive dehydrogenation to heptatriene and then cyclization to toluene. These transformations occur in the adsorbed phase and on the same active site, in such a way that only a small fraction of the total adsorbed intermediates formed appear in the gas phase. The rest are not desorbed due to their high reactivity.
Fil: Arcoya, Adolfo. Consejo Superior de Investigaciones Científicas. Instituto de Catálisis y Petroleoquímica; España
Fil: Seoane, Xosé L.. Consejo Superior de Investigaciones Científicas. Instituto de Catálisis y Petroleoquímica; España
Fil: Grau, Javier Mario. Consejo Superior de Investigaciones Científicas. Instituto de Catálisis y Petroleoquímica; España. 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
-
Ethylcyclopentane
Methylcyclohexane
N-Heptane Dehydrocyclization Mechanism
Pt/Kl Catalysts
Toluene - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/55357
Ver los metadatos del registro completo
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spelling |
Dehydrocyclization of n-heptane over a PtBa/Kl catalyst: Reaction mechanismArcoya, AdolfoSeoane, Xosé L.Grau, Javier MarioEthylcyclopentaneMethylcyclohexaneN-Heptane Dehydrocyclization MechanismPt/Kl CatalystsToluenehttps://purl.org/becyt/ford/2.4https://purl.org/becyt/ford/2The dehydrocyclization of n-heptane to toluene over a 1 wt.% PtBa/KL catalyst was studied in a fixed bed tubular reactor, at 723 K, 100 kPa and space-time in the range of 1.8-117.0 g h mol-1. The catalyst was prepared by incipient wetness impregnation of a KL zeolite, previously alkalized with BaO, using an aqueous solution of tetraammineplatinum(II) hydroxide as platinum precursor. The solid was successively calcined in an oxygen stream and reduced in flowing hydrogen, at 773 K. Reaction is highly selective towards toluene (>60%) at conversion levels even close to 100%, with benzene, heptenes, methylcyclohexane and ethylcyclopentane as major byproducts. From the product distribution and the dehydrocyclization results of the reaction products performed in separate experiments, a macroscopic mechanism is proposed. Essentially, n-heptane is adsorbed and transformed on the catalyst surface through an alkene-like intermediate (σC7=), following five possible parallel interconnected paths, involving hydrogenolysis, isomerization, dehydrogenation and cyclization reactions. Formation of toluene as a primary product is explained by a "rake scheme" in which the σC7= intermediate is successively transformed, following two possible routes: (a) C1-C6 ring closure and subsequent further dehydrogenation; (b) successive dehydrogenation to heptatriene and then cyclization to toluene. These transformations occur in the adsorbed phase and on the same active site, in such a way that only a small fraction of the total adsorbed intermediates formed appear in the gas phase. The rest are not desorbed due to their high reactivity.Fil: Arcoya, Adolfo. Consejo Superior de Investigaciones Científicas. Instituto de Catálisis y Petroleoquímica; EspañaFil: Seoane, Xosé L.. Consejo Superior de Investigaciones Científicas. Instituto de Catálisis y Petroleoquímica; EspañaFil: Grau, Javier Mario. Consejo Superior de Investigaciones Científicas. Instituto de Catálisis y Petroleoquímica; España. 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 Science2005-04info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/55357Arcoya, Adolfo; Seoane, Xosé L.; Grau, Javier Mario; Dehydrocyclization of n-heptane over a PtBa/Kl catalyst: Reaction mechanism; Elsevier Science; Applied Catalysis A: General; 284; 1-2; 4-2005; 85-950926-860XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.apcata.2005.01.024info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0926860X0500030Xinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:35:54Zoai:ri.conicet.gov.ar:11336/55357instacron: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 09:35:54.987CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Dehydrocyclization of n-heptane over a PtBa/Kl catalyst: Reaction mechanism |
title |
Dehydrocyclization of n-heptane over a PtBa/Kl catalyst: Reaction mechanism |
spellingShingle |
Dehydrocyclization of n-heptane over a PtBa/Kl catalyst: Reaction mechanism Arcoya, Adolfo Ethylcyclopentane Methylcyclohexane N-Heptane Dehydrocyclization Mechanism Pt/Kl Catalysts Toluene |
title_short |
Dehydrocyclization of n-heptane over a PtBa/Kl catalyst: Reaction mechanism |
title_full |
Dehydrocyclization of n-heptane over a PtBa/Kl catalyst: Reaction mechanism |
title_fullStr |
Dehydrocyclization of n-heptane over a PtBa/Kl catalyst: Reaction mechanism |
title_full_unstemmed |
Dehydrocyclization of n-heptane over a PtBa/Kl catalyst: Reaction mechanism |
title_sort |
Dehydrocyclization of n-heptane over a PtBa/Kl catalyst: Reaction mechanism |
dc.creator.none.fl_str_mv |
Arcoya, Adolfo Seoane, Xosé L. Grau, Javier Mario |
author |
Arcoya, Adolfo |
author_facet |
Arcoya, Adolfo Seoane, Xosé L. Grau, Javier Mario |
author_role |
author |
author2 |
Seoane, Xosé L. Grau, Javier Mario |
author2_role |
author author |
dc.subject.none.fl_str_mv |
Ethylcyclopentane Methylcyclohexane N-Heptane Dehydrocyclization Mechanism Pt/Kl Catalysts Toluene |
topic |
Ethylcyclopentane Methylcyclohexane N-Heptane Dehydrocyclization Mechanism Pt/Kl Catalysts 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 |
The dehydrocyclization of n-heptane to toluene over a 1 wt.% PtBa/KL catalyst was studied in a fixed bed tubular reactor, at 723 K, 100 kPa and space-time in the range of 1.8-117.0 g h mol-1. The catalyst was prepared by incipient wetness impregnation of a KL zeolite, previously alkalized with BaO, using an aqueous solution of tetraammineplatinum(II) hydroxide as platinum precursor. The solid was successively calcined in an oxygen stream and reduced in flowing hydrogen, at 773 K. Reaction is highly selective towards toluene (>60%) at conversion levels even close to 100%, with benzene, heptenes, methylcyclohexane and ethylcyclopentane as major byproducts. From the product distribution and the dehydrocyclization results of the reaction products performed in separate experiments, a macroscopic mechanism is proposed. Essentially, n-heptane is adsorbed and transformed on the catalyst surface through an alkene-like intermediate (σC7=), following five possible parallel interconnected paths, involving hydrogenolysis, isomerization, dehydrogenation and cyclization reactions. Formation of toluene as a primary product is explained by a "rake scheme" in which the σC7= intermediate is successively transformed, following two possible routes: (a) C1-C6 ring closure and subsequent further dehydrogenation; (b) successive dehydrogenation to heptatriene and then cyclization to toluene. These transformations occur in the adsorbed phase and on the same active site, in such a way that only a small fraction of the total adsorbed intermediates formed appear in the gas phase. The rest are not desorbed due to their high reactivity. Fil: Arcoya, Adolfo. Consejo Superior de Investigaciones Científicas. Instituto de Catálisis y Petroleoquímica; España Fil: Seoane, Xosé L.. Consejo Superior de Investigaciones Científicas. Instituto de Catálisis y Petroleoquímica; España Fil: Grau, Javier Mario. Consejo Superior de Investigaciones Científicas. Instituto de Catálisis y Petroleoquímica; España. 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 |
The dehydrocyclization of n-heptane to toluene over a 1 wt.% PtBa/KL catalyst was studied in a fixed bed tubular reactor, at 723 K, 100 kPa and space-time in the range of 1.8-117.0 g h mol-1. The catalyst was prepared by incipient wetness impregnation of a KL zeolite, previously alkalized with BaO, using an aqueous solution of tetraammineplatinum(II) hydroxide as platinum precursor. The solid was successively calcined in an oxygen stream and reduced in flowing hydrogen, at 773 K. Reaction is highly selective towards toluene (>60%) at conversion levels even close to 100%, with benzene, heptenes, methylcyclohexane and ethylcyclopentane as major byproducts. From the product distribution and the dehydrocyclization results of the reaction products performed in separate experiments, a macroscopic mechanism is proposed. Essentially, n-heptane is adsorbed and transformed on the catalyst surface through an alkene-like intermediate (σC7=), following five possible parallel interconnected paths, involving hydrogenolysis, isomerization, dehydrogenation and cyclization reactions. Formation of toluene as a primary product is explained by a "rake scheme" in which the σC7= intermediate is successively transformed, following two possible routes: (a) C1-C6 ring closure and subsequent further dehydrogenation; (b) successive dehydrogenation to heptatriene and then cyclization to toluene. These transformations occur in the adsorbed phase and on the same active site, in such a way that only a small fraction of the total adsorbed intermediates formed appear in the gas phase. The rest are not desorbed due to their high reactivity. |
publishDate |
2005 |
dc.date.none.fl_str_mv |
2005-04 |
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/11336/55357 Arcoya, Adolfo; Seoane, Xosé L.; Grau, Javier Mario; Dehydrocyclization of n-heptane over a PtBa/Kl catalyst: Reaction mechanism; Elsevier Science; Applied Catalysis A: General; 284; 1-2; 4-2005; 85-95 0926-860X CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/55357 |
identifier_str_mv |
Arcoya, Adolfo; Seoane, Xosé L.; Grau, Javier Mario; Dehydrocyclization of n-heptane over a PtBa/Kl catalyst: Reaction mechanism; Elsevier Science; Applied Catalysis A: General; 284; 1-2; 4-2005; 85-95 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.2005.01.024 info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0926860X0500030X |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-nd/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-nd/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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1844613122735734784 |
score |
13.070432 |