Diffusion and adsorption selectivities of hydrocarbons over FCC catalysts

Autores
Avila, Adolfo María; Bidabehere, Claudia María; Sedran, Ulises Anselmo
Año de publicación
2007
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The adsorption isotherms of hexane, toluene and decane on a commercial FCC catalyst were determined in experiments performed in a CREC Riser Simulator laboratory reactor injecting different volumes of the pure hydrocarbons at 250, 300 and 350 °C. The adsorption isotherms could be described by Langmuir expressions, and the parameters assessed from the information given by simple mass balances, showed to be in line with previous reports. The order of adsorption constants was decane > toluene > hexane. The heats of adsorption were assessed. The simulation of the evolution of the pressure in the system in short contact time experiments with an unsteady state diffusion-adsorption model that considered the influence of the concentration on diffusion, allowed to assess the diffusion parameters corresponding to diluted systems. It was observed that the mechanism for mass transfer of n-paraffins inside the Y zeolite pores above 250 °C is not purely configurational. Experiments with short contact times typical of the commercial FCC process showed that decane and toluene, but not hexane, were adsorbed close to equilibrium under these experimental conditions. Apparent and equilibrium adsorption, and diffusion selectivities were defined considering hexane as the reference hydrocarbon, and they clearly indicated that diffusion resistances mask the assessment of adsorption parameters. Apparent selectivities become closer to equilibrium selectivities at higher system pressures, due to increases in the effective diffusivities.
Fil: Avila, Adolfo María. 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: Bidabehere, Claudia María. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina
Fil: Sedran, Ulises Anselmo. 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
Adsorption
Diffusion
Fcc
Hydrocarbons
Paraffins
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:11336/66119
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Diffusion and adsorption selectivities of hydrocarbons over FCC catalystsAvila, Adolfo MaríaBidabehere, Claudia MaríaSedran, Ulises AnselmoAdsorptionDiffusionFccHydrocarbonsParaffinshttps://purl.org/becyt/ford/2.4https://purl.org/becyt/ford/2The adsorption isotherms of hexane, toluene and decane on a commercial FCC catalyst were determined in experiments performed in a CREC Riser Simulator laboratory reactor injecting different volumes of the pure hydrocarbons at 250, 300 and 350 °C. The adsorption isotherms could be described by Langmuir expressions, and the parameters assessed from the information given by simple mass balances, showed to be in line with previous reports. The order of adsorption constants was decane > toluene > hexane. The heats of adsorption were assessed. The simulation of the evolution of the pressure in the system in short contact time experiments with an unsteady state diffusion-adsorption model that considered the influence of the concentration on diffusion, allowed to assess the diffusion parameters corresponding to diluted systems. It was observed that the mechanism for mass transfer of n-paraffins inside the Y zeolite pores above 250 °C is not purely configurational. Experiments with short contact times typical of the commercial FCC process showed that decane and toluene, but not hexane, were adsorbed close to equilibrium under these experimental conditions. Apparent and equilibrium adsorption, and diffusion selectivities were defined considering hexane as the reference hydrocarbon, and they clearly indicated that diffusion resistances mask the assessment of adsorption parameters. Apparent selectivities become closer to equilibrium selectivities at higher system pressures, due to increases in the effective diffusivities.Fil: Avila, Adolfo María. 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: Bidabehere, Claudia María. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; ArgentinaFil: Sedran, Ulises Anselmo. 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 Science Sa2007-08info: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/11336/66119Avila, Adolfo María; Bidabehere, Claudia María; Sedran, Ulises Anselmo; Diffusion and adsorption selectivities of hydrocarbons over FCC catalysts; Elsevier Science Sa; Chemical Engineering Journal; 132; 1-3; 8-2007; 67-751385-8947CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.cej.2007.01.020info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:50:49Zoai:ri.conicet.gov.ar:11336/66119instacron: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 09:50:49.297CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Diffusion and adsorption selectivities of hydrocarbons over FCC catalysts
title Diffusion and adsorption selectivities of hydrocarbons over FCC catalysts
spellingShingle Diffusion and adsorption selectivities of hydrocarbons over FCC catalysts
Avila, Adolfo María
Adsorption
Diffusion
Fcc
Hydrocarbons
Paraffins
title_short Diffusion and adsorption selectivities of hydrocarbons over FCC catalysts
title_full Diffusion and adsorption selectivities of hydrocarbons over FCC catalysts
title_fullStr Diffusion and adsorption selectivities of hydrocarbons over FCC catalysts
title_full_unstemmed Diffusion and adsorption selectivities of hydrocarbons over FCC catalysts
title_sort Diffusion and adsorption selectivities of hydrocarbons over FCC catalysts
dc.creator.none.fl_str_mv Avila, Adolfo María
Bidabehere, Claudia María
Sedran, Ulises Anselmo
author Avila, Adolfo María
author_facet Avila, Adolfo María
Bidabehere, Claudia María
Sedran, Ulises Anselmo
author_role author
author2 Bidabehere, Claudia María
Sedran, Ulises Anselmo
author2_role author
author
dc.subject.none.fl_str_mv Adsorption
Diffusion
Fcc
Hydrocarbons
Paraffins
topic Adsorption
Diffusion
Fcc
Hydrocarbons
Paraffins
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 adsorption isotherms of hexane, toluene and decane on a commercial FCC catalyst were determined in experiments performed in a CREC Riser Simulator laboratory reactor injecting different volumes of the pure hydrocarbons at 250, 300 and 350 °C. The adsorption isotherms could be described by Langmuir expressions, and the parameters assessed from the information given by simple mass balances, showed to be in line with previous reports. The order of adsorption constants was decane > toluene > hexane. The heats of adsorption were assessed. The simulation of the evolution of the pressure in the system in short contact time experiments with an unsteady state diffusion-adsorption model that considered the influence of the concentration on diffusion, allowed to assess the diffusion parameters corresponding to diluted systems. It was observed that the mechanism for mass transfer of n-paraffins inside the Y zeolite pores above 250 °C is not purely configurational. Experiments with short contact times typical of the commercial FCC process showed that decane and toluene, but not hexane, were adsorbed close to equilibrium under these experimental conditions. Apparent and equilibrium adsorption, and diffusion selectivities were defined considering hexane as the reference hydrocarbon, and they clearly indicated that diffusion resistances mask the assessment of adsorption parameters. Apparent selectivities become closer to equilibrium selectivities at higher system pressures, due to increases in the effective diffusivities.
Fil: Avila, Adolfo María. 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: Bidabehere, Claudia María. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina
Fil: Sedran, Ulises Anselmo. 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 adsorption isotherms of hexane, toluene and decane on a commercial FCC catalyst were determined in experiments performed in a CREC Riser Simulator laboratory reactor injecting different volumes of the pure hydrocarbons at 250, 300 and 350 °C. The adsorption isotherms could be described by Langmuir expressions, and the parameters assessed from the information given by simple mass balances, showed to be in line with previous reports. The order of adsorption constants was decane > toluene > hexane. The heats of adsorption were assessed. The simulation of the evolution of the pressure in the system in short contact time experiments with an unsteady state diffusion-adsorption model that considered the influence of the concentration on diffusion, allowed to assess the diffusion parameters corresponding to diluted systems. It was observed that the mechanism for mass transfer of n-paraffins inside the Y zeolite pores above 250 °C is not purely configurational. Experiments with short contact times typical of the commercial FCC process showed that decane and toluene, but not hexane, were adsorbed close to equilibrium under these experimental conditions. Apparent and equilibrium adsorption, and diffusion selectivities were defined considering hexane as the reference hydrocarbon, and they clearly indicated that diffusion resistances mask the assessment of adsorption parameters. Apparent selectivities become closer to equilibrium selectivities at higher system pressures, due to increases in the effective diffusivities.
publishDate 2007
dc.date.none.fl_str_mv 2007-08
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/11336/66119
Avila, Adolfo María; Bidabehere, Claudia María; Sedran, Ulises Anselmo; Diffusion and adsorption selectivities of hydrocarbons over FCC catalysts; Elsevier Science Sa; Chemical Engineering Journal; 132; 1-3; 8-2007; 67-75
1385-8947
CONICET Digital
CONICET
url http://hdl.handle.net/11336/66119
identifier_str_mv Avila, Adolfo María; Bidabehere, Claudia María; Sedran, Ulises Anselmo; Diffusion and adsorption selectivities of hydrocarbons over FCC catalysts; Elsevier Science Sa; Chemical Engineering Journal; 132; 1-3; 8-2007; 67-75
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/doi/10.1016/j.cej.2007.01.020
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 Sa
publisher.none.fl_str_mv Elsevier Science Sa
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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