Xylene Isomerization over Beta Zeolites in Liquid Phase

An experimental study of xylene isomers interconversion (isomerization) kinetics was conducted to gain a deeper insight into the field. Two beta zeolites with SiO2/Al2O3 ratio of 35 (BEA35) and 38 (BEA38) were used as catalysts for the performed experiments. The isomerization reactions were carried...

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Autores: Shi, Qian, Gonçalves, Jonathan C., Ferreira, Alexandre F.P., González Plaza, Marta, Rodrigues, Alírio Egídio
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2018
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/290377
Acceso en línea:http://hdl.handle.net/10261/290377
https://api.elsevier.com/content/abstract/scopus_id/85046031306
Access Level:acceso abierto
Palabra clave:xilene isomers
isomerization
modeling
kinetic constants
Activation energy
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spelling Xylene Isomerization over Beta Zeolites in Liquid PhaseShi, QianGonçalves, Jonathan C.Ferreira, Alexandre F.P.González Plaza, MartaRodrigues, Alírio Egídioxilene isomersisomerizationmodelingkinetic constantsActivation energyAn experimental study of xylene isomers interconversion (isomerization) kinetics was conducted to gain a deeper insight into the field. Two beta zeolites with SiO2/Al2O3 ratio of 35 (BEA35) and 38 (BEA38) were used as catalysts for the performed experiments. The isomerization reactions were carried out under the following conditions: 513, 493, 473, and 453 K at 2.1 MPa in liquid phase. It was verified that all reactions were in the kinetic-controlled regime. Kinetic constants were estimated with four different models; two of them were based on the xylene isomerization thermodynamic equilibrium from the literature. The linear reaction scheme, which does not consider the direct conversion between p- and o-xylene, presented a better fit to the experimental values. Higher conversion of p-xylene was observed when compared with the conversion of the other two isomers. This may be attributed to its smaller molecular size. BEA35 presented better performance due to its higher amount of Brønsted acid sites. Finally, activation energies over the two catalysts, estimated through Arrhenius equation, presented similar values.This work was financially supported by Project POCI-01-0145-FEDER-006984—Associate Laboratory LSRE-LCM funded by FEDER through COMPETE2020 Programa Operacional Competitividade e Internacionalização (POCI)—and by national funds through FCT—Fundação para a Ciência e Tecnologia. This work was financed by AIProcMat@N2020, NORTE-01-0145-FEDER-000006. Ms. Shi Qian acknowledges the financial support from China Scholarship Council for her Ph.D. grant (File No. 201505130003, 2015-2019). Dr. M.G. Plaza acknowledges the award of a Ramon y Cajal contract (RyC-2015-17516) from the Spanish MINECO. The support of Prof. M.F. Ribeiro and Dr. A.R. Fernandes on the pyridine desorption by FTIR is highly appreciated. The authors thank Clariant Produkte (Deutschland) GmbH for providing the beta SAR = 35 zeolite and give special thanks to Dr. Ernst Köhler.Peer reviewedAmerican Chemical SocietyFundação para a Ciência e a Tecnologia (Portugal)González Plaza, Marta [0000-0001-5619-5503]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202320232018info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/290377https://api.elsevier.com/content/abstract/scopus_id/85046031306reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésIndustrial and Engineering Chemistry Researchhttps://doi.org/10.1021/acs.iecr.8b00585Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2903772026-05-22T06:33:51Z
dc.title.none.fl_str_mv Xylene Isomerization over Beta Zeolites in Liquid Phase
title Xylene Isomerization over Beta Zeolites in Liquid Phase
spellingShingle Xylene Isomerization over Beta Zeolites in Liquid Phase
Shi, Qian
xilene isomers
isomerization
modeling
kinetic constants
Activation energy
title_short Xylene Isomerization over Beta Zeolites in Liquid Phase
title_full Xylene Isomerization over Beta Zeolites in Liquid Phase
title_fullStr Xylene Isomerization over Beta Zeolites in Liquid Phase
title_full_unstemmed Xylene Isomerization over Beta Zeolites in Liquid Phase
title_sort Xylene Isomerization over Beta Zeolites in Liquid Phase
dc.creator.none.fl_str_mv Shi, Qian
Gonçalves, Jonathan C.
Ferreira, Alexandre F.P.
González Plaza, Marta
Rodrigues, Alírio Egídio
author Shi, Qian
author_facet Shi, Qian
Gonçalves, Jonathan C.
Ferreira, Alexandre F.P.
González Plaza, Marta
Rodrigues, Alírio Egídio
author_role author
author2 Gonçalves, Jonathan C.
Ferreira, Alexandre F.P.
González Plaza, Marta
Rodrigues, Alírio Egídio
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Fundação para a Ciência e a Tecnologia (Portugal)
González Plaza, Marta [0000-0001-5619-5503]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv xilene isomers
isomerization
modeling
kinetic constants
Activation energy
topic xilene isomers
isomerization
modeling
kinetic constants
Activation energy
description An experimental study of xylene isomers interconversion (isomerization) kinetics was conducted to gain a deeper insight into the field. Two beta zeolites with SiO2/Al2O3 ratio of 35 (BEA35) and 38 (BEA38) were used as catalysts for the performed experiments. The isomerization reactions were carried out under the following conditions: 513, 493, 473, and 453 K at 2.1 MPa in liquid phase. It was verified that all reactions were in the kinetic-controlled regime. Kinetic constants were estimated with four different models; two of them were based on the xylene isomerization thermodynamic equilibrium from the literature. The linear reaction scheme, which does not consider the direct conversion between p- and o-xylene, presented a better fit to the experimental values. Higher conversion of p-xylene was observed when compared with the conversion of the other two isomers. This may be attributed to its smaller molecular size. BEA35 presented better performance due to its higher amount of Brønsted acid sites. Finally, activation energies over the two catalysts, estimated through Arrhenius equation, presented similar values.
publishDate 2018
dc.date.none.fl_str_mv 2018
2023
2023
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/290377
https://api.elsevier.com/content/abstract/scopus_id/85046031306
url http://hdl.handle.net/10261/290377
https://api.elsevier.com/content/abstract/scopus_id/85046031306
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Industrial and Engineering Chemistry Research
https://doi.org/10.1021/acs.iecr.8b00585
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv American Chemical Society
publisher.none.fl_str_mv American Chemical Society
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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