Characterization and acidic properties of AlMCM-41 prepared by conventional and post-synthesis alumination

Detalhes bibliográficos
Autor(a) principal: Nascimento, Rubens Maribondo do
Data de Publicação: 2015
Outros Autores: Costa, Maria José Fonseca, Chellappa, Thiago, Araujo, Antonio Souza de, Fonseca, Viviane Muniz, Fernandes Júnior, Valter José, Pacheco, Jose G. A.
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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spelling 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:123456789/45739Tk9OLUVYQ0xVU0lWRSBESVNUUklCVVRJT04gTElDRU5TRQoKCkJ5IHNpZ25pbmcgYW5kIGRlbGl2ZXJpbmcgdGhpcyBsaWNlbnNlLCBNci4gKGF1dGhvciBvciBjb3B5cmlnaHQgaG9sZGVyKToKCgphKSBHcmFudHMgdGhlIFVuaXZlcnNpZGFkZSBGZWRlcmFsIFJpbyBHcmFuZGUgZG8gTm9ydGUgdGhlIG5vbi1leGNsdXNpdmUgcmlnaHQgb2YKcmVwcm9kdWNlLCBjb252ZXJ0IChhcyBkZWZpbmVkIGJlbG93KSwgY29tbXVuaWNhdGUgYW5kIC8gb3IKZGlzdHJpYnV0ZSB0aGUgZGVsaXZlcmVkIGRvY3VtZW50IChpbmNsdWRpbmcgYWJzdHJhY3QgLyBhYnN0cmFjdCkgaW4KZGlnaXRhbCBvciBwcmludGVkIGZvcm1hdCBhbmQgaW4gYW55IG1lZGl1bS4KCmIpIERlY2xhcmVzIHRoYXQgdGhlIGRvY3VtZW50IHN1Ym1pdHRlZCBpcyBpdHMgb3JpZ2luYWwgd29yaywgYW5kIHRoYXQKeW91IGhhdmUgdGhlIHJpZ2h0IHRvIGdyYW50IHRoZSByaWdodHMgY29udGFpbmVkIGluIHRoaXMgbGljZW5zZS4gRGVjbGFyZXMKdGhhdCB0aGUgZGVsaXZlcnkgb2YgdGhlIGRvY3VtZW50IGRvZXMgbm90IGluZnJpbmdlLCBhcyBmYXIgYXMgaXQgaXMKdGhlIHJpZ2h0cyBvZiBhbnkgb3RoZXIgcGVyc29uIG9yIGVudGl0eS4KCmMpIElmIHRoZSBkb2N1bWVudCBkZWxpdmVyZWQgY29udGFpbnMgbWF0ZXJpYWwgd2hpY2ggZG9lcyBub3QKcmlnaHRzLCBkZWNsYXJlcyB0aGF0IGl0IGhhcyBvYnRhaW5lZCBhdXRob3JpemF0aW9uIGZyb20gdGhlIGhvbGRlciBvZiB0aGUKY29weXJpZ2h0IHRvIGdyYW50IHRoZSBVbml2ZXJzaWRhZGUgRmVkZXJhbCBkbyBSaW8gR3JhbmRlIGRvIE5vcnRlIHRoZSByaWdodHMgcmVxdWlyZWQgYnkgdGhpcyBsaWNlbnNlLCBhbmQgdGhhdCB0aGlzIG1hdGVyaWFsIHdob3NlIHJpZ2h0cyBhcmUgb2YKdGhpcmQgcGFydGllcyBpcyBjbGVhcmx5IGlkZW50aWZpZWQgYW5kIHJlY29nbml6ZWQgaW4gdGhlIHRleHQgb3IKY29udGVudCBvZiB0aGUgZG9jdW1lbnQgZGVsaXZlcmVkLgoKSWYgdGhlIGRvY3VtZW50IHN1Ym1pdHRlZCBpcyBiYXNlZCBvbiBmdW5kZWQgb3Igc3VwcG9ydGVkIHdvcmsKYnkgYW5vdGhlciBpbnN0aXR1dGlvbiBvdGhlciB0aGFuIHRoZSBVbml2ZXJzaWRhZGUgRmVkZXJhbCBkbyBSaW8gR3JhbmRlIGRvIE5vcnRlLCBkZWNsYXJlcyB0aGF0IGl0IGhhcyBmdWxmaWxsZWQgYW55IG9ibGlnYXRpb25zIHJlcXVpcmVkIGJ5IHRoZSByZXNwZWN0aXZlIGFncmVlbWVudCBvciBhZ3JlZW1lbnQuCgpUaGUgVW5pdmVyc2lkYWRlIEZlZGVyYWwgZG8gUmlvIEdyYW5kZSBkbyBOb3J0ZSB3aWxsIGNsZWFybHkgaWRlbnRpZnkgaXRzIG5hbWUgKHMpIGFzIHRoZSBhdXRob3IgKHMpIG9yIGhvbGRlciAocykgb2YgdGhlIGRvY3VtZW50J3MgcmlnaHRzCmRlbGl2ZXJlZCwgYW5kIHdpbGwgbm90IG1ha2UgYW55IGNoYW5nZXMsIG90aGVyIHRoYW4gdGhvc2UgcGVybWl0dGVkIGJ5CnRoaXMgbGljZW5zZQo=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
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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
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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dc.publisher.none.fl_str_mv Australian Journal of Chemistry
publisher.none.fl_str_mv Australian Journal of Chemistry
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