Friedel-crafts acylation reaction over hierarchical Y zeolite modified through surfactant mediated technology
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , , |
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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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 |
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metadata only access info:eu-repo/semantics/openAccess |
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metadata only access |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
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) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799133488912269312 |