Hierarchical chabazites synthesized by combining primary and secondary structure-directing agents
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.micromeso.2022.112311 http://hdl.handle.net/11449/246229 |
Resumo: | Modifying the physical and chemical properties of zeolites by altering the synthesis parameters or using post-synthesis treatments may offer additional properties other than those that make them widely used materials. Remarkably, the chabazite SSZ-13 zeolite possesses a small pore opening that provides access to a large cavity, making the structure suitable for converting methanol to products. Herein, we altered the porosity of SSZ-13 by adding various amounts (2, 4, and 8% in relation to the molar silica content) of dimethyloctadecyl[3-(trimethoxysilyl)propyl] ammonium (DMOAP) into the reaction mixture. The introduction of DMOAP enabled the formation of the pure chabazite structure without affecting the incorporation of aluminum atoms into the zeolite framework. At the same time, its incorporation led to changes in porosity, increasing the external surface area and creating mesopores without affecting the formation of micropores. Concerning the catalytic conversion of methanol into products at low temperatures (210 °C), the additional porosity decreased the methanol to dimethyl ether conversion, indicating that the confinement effect plays an essential role in stabilizing the reaction intermediates. However, at higher temperatures (400 °C), the mesopores played an essential role in the methanol to olefins reaction by increasing the catalyst lifetime and the conversion over time due to improved accessibility of methanol to reaction intermediates confined in the micropores. |
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Hierarchical chabazites synthesized by combining primary and secondary structure-directing agentsCrystallization under tumbling conditionsDMOAPHierarchical zeolitesMesoporous zeolitesSSZ-13Modifying the physical and chemical properties of zeolites by altering the synthesis parameters or using post-synthesis treatments may offer additional properties other than those that make them widely used materials. Remarkably, the chabazite SSZ-13 zeolite possesses a small pore opening that provides access to a large cavity, making the structure suitable for converting methanol to products. Herein, we altered the porosity of SSZ-13 by adding various amounts (2, 4, and 8% in relation to the molar silica content) of dimethyloctadecyl[3-(trimethoxysilyl)propyl] ammonium (DMOAP) into the reaction mixture. The introduction of DMOAP enabled the formation of the pure chabazite structure without affecting the incorporation of aluminum atoms into the zeolite framework. At the same time, its incorporation led to changes in porosity, increasing the external surface area and creating mesopores without affecting the formation of micropores. Concerning the catalytic conversion of methanol into products at low temperatures (210 °C), the additional porosity decreased the methanol to dimethyl ether conversion, indicating that the confinement effect plays an essential role in stabilizing the reaction intermediates. However, at higher temperatures (400 °C), the mesopores played an essential role in the methanol to olefins reaction by increasing the catalyst lifetime and the conversion over time due to improved accessibility of methanol to reaction intermediates confined in the micropores.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Science and Engineering Research CouncilInstitute of Chemistry São Paulo State University - UNESPDepartment of Chemistry University of Western OntarioInstitute of Chemistry São Paulo State University - UNESPUniversidade Estadual Paulista (UNESP)University of Western OntarioMarins, Natália Hadler [UNESP]Feliciano Pereira, Elen Maria [UNESP]Alahakoon, Sandamini H.Huang, YiningMartins, Leandro [UNESP]2023-07-29T12:35:14Z2023-07-29T12:35:14Z2022-12-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1016/j.micromeso.2022.112311Microporous and Mesoporous Materials, v. 346.1387-1811http://hdl.handle.net/11449/24622910.1016/j.micromeso.2022.1123112-s2.0-85141259578Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengMicroporous and Mesoporous Materialsinfo:eu-repo/semantics/openAccess2023-07-29T12:35:14Zoai:repositorio.unesp.br:11449/246229Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T19:59:45.998453Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Hierarchical chabazites synthesized by combining primary and secondary structure-directing agents |
title |
Hierarchical chabazites synthesized by combining primary and secondary structure-directing agents |
spellingShingle |
Hierarchical chabazites synthesized by combining primary and secondary structure-directing agents Marins, Natália Hadler [UNESP] Crystallization under tumbling conditions DMOAP Hierarchical zeolites Mesoporous zeolites SSZ-13 |
title_short |
Hierarchical chabazites synthesized by combining primary and secondary structure-directing agents |
title_full |
Hierarchical chabazites synthesized by combining primary and secondary structure-directing agents |
title_fullStr |
Hierarchical chabazites synthesized by combining primary and secondary structure-directing agents |
title_full_unstemmed |
Hierarchical chabazites synthesized by combining primary and secondary structure-directing agents |
title_sort |
Hierarchical chabazites synthesized by combining primary and secondary structure-directing agents |
author |
Marins, Natália Hadler [UNESP] |
author_facet |
Marins, Natália Hadler [UNESP] Feliciano Pereira, Elen Maria [UNESP] Alahakoon, Sandamini H. Huang, Yining Martins, Leandro [UNESP] |
author_role |
author |
author2 |
Feliciano Pereira, Elen Maria [UNESP] Alahakoon, Sandamini H. Huang, Yining Martins, Leandro [UNESP] |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (UNESP) University of Western Ontario |
dc.contributor.author.fl_str_mv |
Marins, Natália Hadler [UNESP] Feliciano Pereira, Elen Maria [UNESP] Alahakoon, Sandamini H. Huang, Yining Martins, Leandro [UNESP] |
dc.subject.por.fl_str_mv |
Crystallization under tumbling conditions DMOAP Hierarchical zeolites Mesoporous zeolites SSZ-13 |
topic |
Crystallization under tumbling conditions DMOAP Hierarchical zeolites Mesoporous zeolites SSZ-13 |
description |
Modifying the physical and chemical properties of zeolites by altering the synthesis parameters or using post-synthesis treatments may offer additional properties other than those that make them widely used materials. Remarkably, the chabazite SSZ-13 zeolite possesses a small pore opening that provides access to a large cavity, making the structure suitable for converting methanol to products. Herein, we altered the porosity of SSZ-13 by adding various amounts (2, 4, and 8% in relation to the molar silica content) of dimethyloctadecyl[3-(trimethoxysilyl)propyl] ammonium (DMOAP) into the reaction mixture. The introduction of DMOAP enabled the formation of the pure chabazite structure without affecting the incorporation of aluminum atoms into the zeolite framework. At the same time, its incorporation led to changes in porosity, increasing the external surface area and creating mesopores without affecting the formation of micropores. Concerning the catalytic conversion of methanol into products at low temperatures (210 °C), the additional porosity decreased the methanol to dimethyl ether conversion, indicating that the confinement effect plays an essential role in stabilizing the reaction intermediates. However, at higher temperatures (400 °C), the mesopores played an essential role in the methanol to olefins reaction by increasing the catalyst lifetime and the conversion over time due to improved accessibility of methanol to reaction intermediates confined in the micropores. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022-12-01 2023-07-29T12:35:14Z 2023-07-29T12:35:14Z |
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.micromeso.2022.112311 Microporous and Mesoporous Materials, v. 346. 1387-1811 http://hdl.handle.net/11449/246229 10.1016/j.micromeso.2022.112311 2-s2.0-85141259578 |
url |
http://dx.doi.org/10.1016/j.micromeso.2022.112311 http://hdl.handle.net/11449/246229 |
identifier_str_mv |
Microporous and Mesoporous Materials, v. 346. 1387-1811 10.1016/j.micromeso.2022.112311 2-s2.0-85141259578 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Microporous and Mesoporous Materials |
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 |
|
_version_ |
1808129146859028480 |