Preparation of hydrophobic MFI zeolites containing hierarchical micro-mesopores using seeds functionalized with octyltriethoxysilane

In this work, we report the synthesis of hydrophobic MFI zeolites presenting a mesopore size distribution and high specific external area (∼288 m2 g−1), employing surface functionalization with octyltriethoxysilane (OTEOS). Previously, the MFI seeds were generated from a clear solution, followed by...

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Detalles Bibliográficos
Autores: Novak, Sara [UNESP], Chaves, Thiago Faheina [UNESP], Martins, Leandro [UNESP], Santilli, Celso Valentim [UNESP]
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2020
País:Brasil
Institución:Universidade Estadual Paulista (UNESP)
Repositorio:Repositório Institucional da UNESP
Idioma:inglés
OAI Identifier:oai:repositorio.unesp.br:11449/201344
Acceso en línea:http://dx.doi.org/10.1016/j.colsurfa.2019.124109
http://hdl.handle.net/11449/201344
Access Level:acceso abierto
Palabra clave:Functionalized zeolite
Hierarchical porosity
Hydrophobic powder
Organosilane
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spelling Preparation of hydrophobic MFI zeolites containing hierarchical micro-mesopores using seeds functionalized with octyltriethoxysilaneFunctionalized zeoliteHierarchical porosityHydrophobic powderOrganosilaneIn this work, we report the synthesis of hydrophobic MFI zeolites presenting a mesopore size distribution and high specific external area (∼288 m2 g−1), employing surface functionalization with octyltriethoxysilane (OTEOS). Previously, the MFI seeds were generated from a clear solution, followed by grafting with OTEOS and crystallization by hydrothermal treatment. The modifications of the properties of MFI synthesized with different amounts of OTEOS (0–15 mol%) were confirmed by X-ray powder diffraction, thermogravimetric, and elemental analyses. Contact angle (θ ∼140°) and 29Si NMR (T3 signals) measurements demonstrated that OTEOS was effectively grafted on the zeolite surface, resulting in powders with hydrophobic profiles. The grafting, which was mostly on the external surface, was crucial for avoiding the aggregation of MFI crystals during the synthesis, since the OTEOS chains (C8) caused steric hindrance, while allowing fine-tuning of the intercrystalline mesopore volume and increasing the external surface area. This effect was less pronounced when grafting of the MFI zeolites was carried out using organosilanes with longer carbon chain lengths (C12 and C16). This method enables the easy preparation of functionalized zeolitic materials, where the hierarchical pores and hydrophobic surface are essential characteristics for advanced technological applications.State University of São Paulo (UNESP) Institute of Chemistry, Rua Prof. Francisco Degni 55State University of São Paulo (UNESP) Institute of Chemistry, Rua Prof. Francisco Degni 55Universidade Estadual Paulista (Unesp)2020-12-12T02:30:12Z2020-12-12T02:30:12Z2020-01-20info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1016/j.colsurfa.2019.124109Colloids and Surfaces A: Physicochemical and Engineering Aspects, v. 585.1873-43590927-7757http://hdl.handle.net/11449/20134410.1016/j.colsurfa.2019.1241092-s2.0-8507543767855842986818708650000-0002-8356-8093Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengColloids and Surfaces A: Physicochemical and Engineering Aspectsinfo:eu-repo/semantics/openAccessNovak, Sara [UNESP]Chaves, Thiago Faheina [UNESP]Martins, Leandro [UNESP]Santilli, Celso Valentim [UNESP]2025-05-28T06:06:37Zoai:repositorio.unesp.br:11449/201344Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestrepositoriounesp@unesp.bropendoar:29462025-05-28T06:06:37Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Preparation of hydrophobic MFI zeolites containing hierarchical micro-mesopores using seeds functionalized with octyltriethoxysilane
title Preparation of hydrophobic MFI zeolites containing hierarchical micro-mesopores using seeds functionalized with octyltriethoxysilane
spellingShingle Preparation of hydrophobic MFI zeolites containing hierarchical micro-mesopores using seeds functionalized with octyltriethoxysilane
Novak, Sara [UNESP]
Functionalized zeolite
Hierarchical porosity
Hydrophobic powder
Organosilane
title_short Preparation of hydrophobic MFI zeolites containing hierarchical micro-mesopores using seeds functionalized with octyltriethoxysilane
title_full Preparation of hydrophobic MFI zeolites containing hierarchical micro-mesopores using seeds functionalized with octyltriethoxysilane
title_fullStr Preparation of hydrophobic MFI zeolites containing hierarchical micro-mesopores using seeds functionalized with octyltriethoxysilane
title_full_unstemmed Preparation of hydrophobic MFI zeolites containing hierarchical micro-mesopores using seeds functionalized with octyltriethoxysilane
title_sort Preparation of hydrophobic MFI zeolites containing hierarchical micro-mesopores using seeds functionalized with octyltriethoxysilane
dc.creator.none.fl_str_mv Novak, Sara [UNESP]
Chaves, Thiago Faheina [UNESP]
Martins, Leandro [UNESP]
Santilli, Celso Valentim [UNESP]
author Novak, Sara [UNESP]
author_facet Novak, Sara [UNESP]
Chaves, Thiago Faheina [UNESP]
Martins, Leandro [UNESP]
Santilli, Celso Valentim [UNESP]
author_role author
author2 Chaves, Thiago Faheina [UNESP]
Martins, Leandro [UNESP]
Santilli, Celso Valentim [UNESP]
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
dc.subject.por.fl_str_mv Functionalized zeolite
Hierarchical porosity
Hydrophobic powder
Organosilane
topic Functionalized zeolite
Hierarchical porosity
Hydrophobic powder
Organosilane
description In this work, we report the synthesis of hydrophobic MFI zeolites presenting a mesopore size distribution and high specific external area (∼288 m2 g−1), employing surface functionalization with octyltriethoxysilane (OTEOS). Previously, the MFI seeds were generated from a clear solution, followed by grafting with OTEOS and crystallization by hydrothermal treatment. The modifications of the properties of MFI synthesized with different amounts of OTEOS (0–15 mol%) were confirmed by X-ray powder diffraction, thermogravimetric, and elemental analyses. Contact angle (θ ∼140°) and 29Si NMR (T3 signals) measurements demonstrated that OTEOS was effectively grafted on the zeolite surface, resulting in powders with hydrophobic profiles. The grafting, which was mostly on the external surface, was crucial for avoiding the aggregation of MFI crystals during the synthesis, since the OTEOS chains (C8) caused steric hindrance, while allowing fine-tuning of the intercrystalline mesopore volume and increasing the external surface area. This effect was less pronounced when grafting of the MFI zeolites was carried out using organosilanes with longer carbon chain lengths (C12 and C16). This method enables the easy preparation of functionalized zeolitic materials, where the hierarchical pores and hydrophobic surface are essential characteristics for advanced technological applications.
publishDate 2020
dc.date.none.fl_str_mv 2020-12-12T02:30:12Z
2020-12-12T02:30:12Z
2020-01-20
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://dx.doi.org/10.1016/j.colsurfa.2019.124109
Colloids and Surfaces A: Physicochemical and Engineering Aspects, v. 585.
1873-4359
0927-7757
http://hdl.handle.net/11449/201344
10.1016/j.colsurfa.2019.124109
2-s2.0-85075437678
5584298681870865
0000-0002-8356-8093
url http://dx.doi.org/10.1016/j.colsurfa.2019.124109
http://hdl.handle.net/11449/201344
identifier_str_mv Colloids and Surfaces A: Physicochemical and Engineering Aspects, v. 585.
1873-4359
0927-7757
10.1016/j.colsurfa.2019.124109
2-s2.0-85075437678
5584298681870865
0000-0002-8356-8093
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Colloids and Surfaces A: Physicochemical and Engineering Aspects
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv repositoriounesp@unesp.br
_version_ 1853671961716064256
score 15,300724

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