Characterization and acidic properties of AlMCM-41 prepared by conventional and post-synthesis alumination
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRN |
Texto Completo: | https://repositorio.ufrn.br/handle/123456789/45739 http://dx.doi.org/10.1071/ch13679 |
Resumo: | The catalysts analysed in the current work are variations of MCM-41. The properties of these highly ordered mesoporous aluminosilicates were adjusted by an isomorphous substitution of Si by a trivalent cation, in this case Al3þ, generating catalysts of the AlMCM-41 type. The materials were synthesized with a silicon/aluminium ratio of 40, through two methods of impregnation of the metal: conventional and post-synthesis alumination. With the aim of determining the density of the acid sites of the Al40MCM-41 prepared by post-synthesis and conventional alumination, studies of the adsorption of n-butylamine probe molecule were carried out. Further, the studied material was characterized by thermogravimetry measurements, providing the profile of decomposition of the samples, which allowed calculation of the densities of the acid sites. The model-free kinetic algorithms were applied in order to determinate conversion and apparent activation energy. Comparison of energy-dispersive X-ray fluorescence and X-ray photoelectron spectroscopy measurements indicated that the post-synthesis method was more favourable based on the metal positioning, ‘anchored’ in the surface of the catalyst. The textural properties of the calcined Al40MCM-41 prepared by post-synthesis and conventional alumination were characterized by X-ray diffraction, N2 isothermal adsorption measurements (Brunauer– Emmett–Teller and Barrett–Joyner–Halenda), transmission electron microscopy, and X-ray photoelectron spectroscopy. |
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Nascimento, Rubens Maribondo doCosta, Maria José FonsecaChellappa, ThiagoAraujo, Antonio Souza deFonseca, Viviane MunizFernandes Júnior, Valter JoséPacheco, Jose G. A.2022-01-31T15:15:21Z2022-01-31T15:15:21Z2015COSTA, Maria José Fonseca; CHELLAPPA, Thiago; ARAÚJO, Antonio Souza de.; FONSECA, Viviane Muniz; FERNANDES JÚNIOR, Valter José; NASCIMENTO, Rubens Maribondo do; PACHECO, José G. A. Characterization and acidic properties of AlMCM-41 prepared by conventional and post-synthesis alumination. Australian Journal of Chemistry, [S.l.], v. 68, n. 1, p. 99, 2015. CSIRO Publishing. http://dx.doi.org/10.1071/ch13679. Disponível em: https://www.publish.csiro.au/ch/CH13679. Acesso em: 07 abr. 2021.Print: 0004-9425Electronic: 1445-0038https://repositorio.ufrn.br/handle/123456789/45739http://dx.doi.org/10.1071/ch13679Australian Journal of Chemistryacidic properties of AlMCM-41post-synthesis aluminationsiliconaluminiumCharacterization and acidic properties of AlMCM-41 prepared by conventional and post-synthesis aluminationinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleThe catalysts analysed in the current work are variations of MCM-41. The properties of these highly ordered mesoporous aluminosilicates were adjusted by an isomorphous substitution of Si by a trivalent cation, in this case Al3þ, generating catalysts of the AlMCM-41 type. The materials were synthesized with a silicon/aluminium ratio of 40, through two methods of impregnation of the metal: conventional and post-synthesis alumination. With the aim of determining the density of the acid sites of the Al40MCM-41 prepared by post-synthesis and conventional alumination, studies of the adsorption of n-butylamine probe molecule were carried out. Further, the studied material was characterized by thermogravimetry measurements, providing the profile of decomposition of the samples, which allowed calculation of the densities of the acid sites. The model-free kinetic algorithms were applied in order to determinate conversion and apparent activation energy. Comparison of energy-dispersive X-ray fluorescence and X-ray photoelectron spectroscopy measurements indicated that the post-synthesis method was more favourable based on the metal positioning, ‘anchored’ in the surface of the catalyst. The textural properties of the calcined Al40MCM-41 prepared by post-synthesis and conventional alumination were characterized by X-ray diffraction, N2 isothermal adsorption measurements (Brunauer– Emmett–Teller and Barrett–Joyner–Halenda), transmission electron microscopy, and X-ray photoelectron spectroscopy.engreponame:Repositório Institucional da UFRNinstname:Universidade Federal do Rio Grande do Norte (UFRN)instacron:UFRNinfo:eu-repo/semantics/openAccessORIGINALCharacterizationAndAcidic_NASCIMENTO_2015.pdfCharacterizationAndAcidic_NASCIMENTO_2015.pdfapplication/pdf666077https://repositorio.ufrn.br/bitstream/123456789/45739/1/CharacterizationAndAcidic_NASCIMENTO_2015.pdfc291b9cbef2cc80291561071431f7cbcMD51CC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; charset=utf-8914https://repositorio.ufrn.br/bitstream/123456789/45739/2/license_rdf4d2950bda3d176f570a9f8b328dfbbefMD52LICENSElicense.txtlicense.txttext/plain; charset=utf-81484https://repositorio.ufrn.br/bitstream/123456789/45739/3/license.txte9597aa2854d128fd968be5edc8a28d9MD53123456789/457392023-02-23 18:54:12.657oai:https://repositorio.ufrn.br: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Repositório de PublicaçõesPUBhttp://repositorio.ufrn.br/oai/opendoar:2023-02-23T21:54:12Repositório Institucional da UFRN - Universidade Federal do Rio Grande do Norte (UFRN)false |
dc.title.pt_BR.fl_str_mv |
Characterization and acidic properties of AlMCM-41 prepared by conventional and post-synthesis alumination |
title |
Characterization and acidic properties of AlMCM-41 prepared by conventional and post-synthesis alumination |
spellingShingle |
Characterization and acidic properties of AlMCM-41 prepared by conventional and post-synthesis alumination Nascimento, Rubens Maribondo do acidic properties of AlMCM-41 post-synthesis alumination silicon aluminium |
title_short |
Characterization and acidic properties of AlMCM-41 prepared by conventional and post-synthesis alumination |
title_full |
Characterization and acidic properties of AlMCM-41 prepared by conventional and post-synthesis alumination |
title_fullStr |
Characterization and acidic properties of AlMCM-41 prepared by conventional and post-synthesis alumination |
title_full_unstemmed |
Characterization and acidic properties of AlMCM-41 prepared by conventional and post-synthesis alumination |
title_sort |
Characterization and acidic properties of AlMCM-41 prepared by conventional and post-synthesis alumination |
author |
Nascimento, Rubens Maribondo do |
author_facet |
Nascimento, Rubens Maribondo do Costa, Maria José Fonseca Chellappa, Thiago Araujo, Antonio Souza de Fonseca, Viviane Muniz Fernandes Júnior, Valter José Pacheco, Jose G. A. |
author_role |
author |
author2 |
Costa, Maria José Fonseca Chellappa, Thiago Araujo, Antonio Souza de Fonseca, Viviane Muniz Fernandes Júnior, Valter José Pacheco, Jose G. A. |
author2_role |
author author author author author author |
dc.contributor.author.fl_str_mv |
Nascimento, Rubens Maribondo do Costa, Maria José Fonseca Chellappa, Thiago Araujo, Antonio Souza de Fonseca, Viviane Muniz Fernandes Júnior, Valter José Pacheco, Jose G. A. |
dc.subject.por.fl_str_mv |
acidic properties of AlMCM-41 post-synthesis alumination silicon aluminium |
topic |
acidic properties of AlMCM-41 post-synthesis alumination silicon aluminium |
description |
The catalysts analysed in the current work are variations of MCM-41. The properties of these highly ordered mesoporous aluminosilicates were adjusted by an isomorphous substitution of Si by a trivalent cation, in this case Al3þ, generating catalysts of the AlMCM-41 type. The materials were synthesized with a silicon/aluminium ratio of 40, through two methods of impregnation of the metal: conventional and post-synthesis alumination. With the aim of determining the density of the acid sites of the Al40MCM-41 prepared by post-synthesis and conventional alumination, studies of the adsorption of n-butylamine probe molecule were carried out. Further, the studied material was characterized by thermogravimetry measurements, providing the profile of decomposition of the samples, which allowed calculation of the densities of the acid sites. The model-free kinetic algorithms were applied in order to determinate conversion and apparent activation energy. Comparison of energy-dispersive X-ray fluorescence and X-ray photoelectron spectroscopy measurements indicated that the post-synthesis method was more favourable based on the metal positioning, ‘anchored’ in the surface of the catalyst. The textural properties of the calcined Al40MCM-41 prepared by post-synthesis and conventional alumination were characterized by X-ray diffraction, N2 isothermal adsorption measurements (Brunauer– Emmett–Teller and Barrett–Joyner–Halenda), transmission electron microscopy, and X-ray photoelectron spectroscopy. |
publishDate |
2015 |
dc.date.issued.fl_str_mv |
2015 |
dc.date.accessioned.fl_str_mv |
2022-01-31T15:15:21Z |
dc.date.available.fl_str_mv |
2022-01-31T15:15:21Z |
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.citation.fl_str_mv |
COSTA, Maria José Fonseca; CHELLAPPA, Thiago; ARAÚJO, Antonio Souza de.; FONSECA, Viviane Muniz; FERNANDES JÚNIOR, Valter José; NASCIMENTO, Rubens Maribondo do; PACHECO, José G. A. Characterization and acidic properties of AlMCM-41 prepared by conventional and post-synthesis alumination. Australian Journal of Chemistry, [S.l.], v. 68, n. 1, p. 99, 2015. CSIRO Publishing. http://dx.doi.org/10.1071/ch13679. Disponível em: https://www.publish.csiro.au/ch/CH13679. Acesso em: 07 abr. 2021. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufrn.br/handle/123456789/45739 |
dc.identifier.issn.none.fl_str_mv |
Print: 0004-9425 Electronic: 1445-0038 |
dc.identifier.doi.none.fl_str_mv |
http://dx.doi.org/10.1071/ch13679 |
identifier_str_mv |
COSTA, Maria José Fonseca; CHELLAPPA, Thiago; ARAÚJO, Antonio Souza de.; FONSECA, Viviane Muniz; FERNANDES JÚNIOR, Valter José; NASCIMENTO, Rubens Maribondo do; PACHECO, José G. A. Characterization and acidic properties of AlMCM-41 prepared by conventional and post-synthesis alumination. Australian Journal of Chemistry, [S.l.], v. 68, n. 1, p. 99, 2015. CSIRO Publishing. http://dx.doi.org/10.1071/ch13679. Disponível em: https://www.publish.csiro.au/ch/CH13679. Acesso em: 07 abr. 2021. Print: 0004-9425 Electronic: 1445-0038 |
url |
https://repositorio.ufrn.br/handle/123456789/45739 http://dx.doi.org/10.1071/ch13679 |
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eng |
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eng |
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Australian Journal of Chemistry |
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Australian Journal of Chemistry |
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