Friedel-crafts acylation reaction over hierarchical Y zeolite modified through surfactant mediated technology

Detalhes bibliográficos
Autor(a) principal: Martins, Angela
Data de Publicação: 2021
Outros Autores: Neves, Vera, Moutinho, João, Nunes, Nelson, Carvalho, Ana
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.21/13825
Resumo: Friedel-Crafts acylation reaction was studied under mild conditions using hierarchical HY zeolite samples prepared through surfactant mediated technology, in the presence of NH4OH, using CTAB or DTAB as surfactants and changing the duration of treatment from 6 to 48 h. The materials were characterized by powder X-ray diffraction, low temperature N2 adsorption isotherms, SEM microscopy and pyridine adsorption followed by FTIR. The catalytic behaviour was studied in the acylation of furan by acetic anhydride. The catalytic results reflect the role of the duration of the treatment as well as the surfactant molecule used. As the time of treatment increases, the enlargement of the pores leads to an increase of the rate constant and turnover frequency (TOF), except for sample modified during longer time, 48 h, due to the occurrence of secondary reactions that produce larger products or reaction intermediates that become trapped inside the pores. The role of the surfactant molecule is also relevant since the sample modified in the presence of the larger surfactant molecule, CTAB, a significant increase in product yield and rate constant is obtained when compared with the sample prepared in the same conditions using DTAB. However, in that case, by prolonging the treatment a substantial decrease in the same parameters occurs due to the occurrence of deactivation phenomena, pointing out that the optimized modification of porosity needs to be customized according to the needs of each catalytic system.
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spelling Friedel-crafts acylation reaction over hierarchical Y zeolite modified through surfactant mediated technologyHierarchical Y zeoliteSurfactant mediated technologyFriedel-crafts acylationKinetic parametersFriedel-Crafts acylation reaction was studied under mild conditions using hierarchical HY zeolite samples prepared through surfactant mediated technology, in the presence of NH4OH, using CTAB or DTAB as surfactants and changing the duration of treatment from 6 to 48 h. The materials were characterized by powder X-ray diffraction, low temperature N2 adsorption isotherms, SEM microscopy and pyridine adsorption followed by FTIR. The catalytic behaviour was studied in the acylation of furan by acetic anhydride. The catalytic results reflect the role of the duration of the treatment as well as the surfactant molecule used. As the time of treatment increases, the enlargement of the pores leads to an increase of the rate constant and turnover frequency (TOF), except for sample modified during longer time, 48 h, due to the occurrence of secondary reactions that produce larger products or reaction intermediates that become trapped inside the pores. The role of the surfactant molecule is also relevant since the sample modified in the presence of the larger surfactant molecule, CTAB, a significant increase in product yield and rate constant is obtained when compared with the sample prepared in the same conditions using DTAB. However, in that case, by prolonging the treatment a substantial decrease in the same parameters occurs due to the occurrence of deactivation phenomena, pointing out that the optimized modification of porosity needs to be customized according to the needs of each catalytic system.ElsevierRCIPLMartins, AngelaNeves, VeraMoutinho, JoãoNunes, NelsonCarvalho, Ana2021-10-06T11:05:47Z2021-082021-08-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.21/13825engMARTINS, Ângela; [et al] – Friedel-crafts acylation reaction over hierarchical Y zeolite modified through surfactant mediated technology. Microporous and Mesoporous Materials. ISSN 1387-1811. Vol. 323 (2021), pp. 1-81387-181110.1016/j.micromeso.2021.1111671873-3093metadata only accessinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-08-03T10:09:11Zoai:repositorio.ipl.pt:10400.21/13825Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:21:42.211616Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Friedel-crafts acylation reaction over hierarchical Y zeolite modified through surfactant mediated technology
title Friedel-crafts acylation reaction over hierarchical Y zeolite modified through surfactant mediated technology
spellingShingle Friedel-crafts acylation reaction over hierarchical Y zeolite modified through surfactant mediated technology
Martins, Angela
Hierarchical Y zeolite
Surfactant mediated technology
Friedel-crafts acylation
Kinetic parameters
title_short Friedel-crafts acylation reaction over hierarchical Y zeolite modified through surfactant mediated technology
title_full Friedel-crafts acylation reaction over hierarchical Y zeolite modified through surfactant mediated technology
title_fullStr Friedel-crafts acylation reaction over hierarchical Y zeolite modified through surfactant mediated technology
title_full_unstemmed Friedel-crafts acylation reaction over hierarchical Y zeolite modified through surfactant mediated technology
title_sort Friedel-crafts acylation reaction over hierarchical Y zeolite modified through surfactant mediated technology
author Martins, Angela
author_facet Martins, Angela
Neves, Vera
Moutinho, João
Nunes, Nelson
Carvalho, Ana
author_role author
author2 Neves, Vera
Moutinho, João
Nunes, Nelson
Carvalho, Ana
author2_role author
author
author
author
dc.contributor.none.fl_str_mv RCIPL
dc.contributor.author.fl_str_mv Martins, Angela
Neves, Vera
Moutinho, João
Nunes, Nelson
Carvalho, Ana
dc.subject.por.fl_str_mv Hierarchical Y zeolite
Surfactant mediated technology
Friedel-crafts acylation
Kinetic parameters
topic Hierarchical Y zeolite
Surfactant mediated technology
Friedel-crafts acylation
Kinetic parameters
description Friedel-Crafts acylation reaction was studied under mild conditions using hierarchical HY zeolite samples prepared through surfactant mediated technology, in the presence of NH4OH, using CTAB or DTAB as surfactants and changing the duration of treatment from 6 to 48 h. The materials were characterized by powder X-ray diffraction, low temperature N2 adsorption isotherms, SEM microscopy and pyridine adsorption followed by FTIR. The catalytic behaviour was studied in the acylation of furan by acetic anhydride. The catalytic results reflect the role of the duration of the treatment as well as the surfactant molecule used. As the time of treatment increases, the enlargement of the pores leads to an increase of the rate constant and turnover frequency (TOF), except for sample modified during longer time, 48 h, due to the occurrence of secondary reactions that produce larger products or reaction intermediates that become trapped inside the pores. The role of the surfactant molecule is also relevant since the sample modified in the presence of the larger surfactant molecule, CTAB, a significant increase in product yield and rate constant is obtained when compared with the sample prepared in the same conditions using DTAB. However, in that case, by prolonging the treatment a substantial decrease in the same parameters occurs due to the occurrence of deactivation phenomena, pointing out that the optimized modification of porosity needs to be customized according to the needs of each catalytic system.
publishDate 2021
dc.date.none.fl_str_mv 2021-10-06T11:05:47Z
2021-08
2021-08-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.21/13825
url http://hdl.handle.net/10400.21/13825
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv MARTINS, Ângela; [et al] – Friedel-crafts acylation reaction over hierarchical Y zeolite modified through surfactant mediated technology. Microporous and Mesoporous Materials. ISSN 1387-1811. Vol. 323 (2021), pp. 1-8
1387-1811
10.1016/j.micromeso.2021.111167
1873-3093
dc.rights.driver.fl_str_mv metadata only access
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rights_invalid_str_mv metadata only access
eu_rights_str_mv openAccess
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dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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