Structural Characterisation and Mechanical Stability of Titanium Substituted Mesoporous Materials

Detalhes bibliográficos
Autor(a) principal: Galacho, Cristina
Data de Publicação: 2010
Outros Autores: Carrott, Manuela, Valerio, Joana, Carrott, Peter, Valente Nabais, Joao
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10174/5826
https://doi.org/10.4028/www.scientific.net/MSF.636-637.136
Resumo: Mesoporous silica and titanium SBA-15 samples with different Si/Ti molar ratio were prepared by direct one-step synthesis under strongly acidic hydrothermal conditions. The materials were characterised by X-ray diffraction, nitrogen adsorption at 77K. The Si/Ti values of the final calcined materials were determined by ICP analysis. It was found that all samples presented 2-D hexagonal structures with high degree of ordering. However, the metal content incorporated in all titanium mesoporous materials was very low, i.e., the Si/Ti molar ratio values of the final calcined samples are significantly different from the initial Si/Ti molar ratio in the synthesis gel. A study of mechanical stability in air was performed by exposing the calcined samples to a unidirectional external pressure in the range 74-814MPa. X-ray diffraction and nitrogen adsorption at 77K, on selected compacted samples, were used in order to evaluate the changes in mesoporous structure. It was found that, for all freshly calcined pure silica and titanium containing samples tested, the high quality SBA-15 structure is still observed after the application 148-370MPa of a unidirectional external pressure and the collapse of the pore structure occurs at around 814MPa.
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spelling Structural Characterisation and Mechanical Stability of Titanium Substituted Mesoporous Materialsmechanical stabilitytitaniumMesoporous silica and titanium SBA-15 samples with different Si/Ti molar ratio were prepared by direct one-step synthesis under strongly acidic hydrothermal conditions. The materials were characterised by X-ray diffraction, nitrogen adsorption at 77K. The Si/Ti values of the final calcined materials were determined by ICP analysis. It was found that all samples presented 2-D hexagonal structures with high degree of ordering. However, the metal content incorporated in all titanium mesoporous materials was very low, i.e., the Si/Ti molar ratio values of the final calcined samples are significantly different from the initial Si/Ti molar ratio in the synthesis gel. A study of mechanical stability in air was performed by exposing the calcined samples to a unidirectional external pressure in the range 74-814MPa. X-ray diffraction and nitrogen adsorption at 77K, on selected compacted samples, were used in order to evaluate the changes in mesoporous structure. It was found that, for all freshly calcined pure silica and titanium containing samples tested, the high quality SBA-15 structure is still observed after the application 148-370MPa of a unidirectional external pressure and the collapse of the pore structure occurs at around 814MPa.Materials Science Forum2012-11-20T17:34:35Z2012-11-202010-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10174/5826http://hdl.handle.net/10174/5826https://doi.org/10.4028/www.scientific.net/MSF.636-637.136engMaterials Science Forum Vols. 636-637 (2010) pp 136-141pcg@uevora.ptmanrc@uevora.ptndpeter@uevora.ptjvn@uevora.pt252Galacho, CristinaCarrott, ManuelaValerio, JoanaCarrott, PeterValente Nabais, Joaoinfo: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:RCAAP2024-01-03T18:44:57Zoai:dspace.uevora.pt:10174/5826Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:00:48.226421Repositório 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 Structural Characterisation and Mechanical Stability of Titanium Substituted Mesoporous Materials
title Structural Characterisation and Mechanical Stability of Titanium Substituted Mesoporous Materials
spellingShingle Structural Characterisation and Mechanical Stability of Titanium Substituted Mesoporous Materials
Galacho, Cristina
mechanical stability
titanium
title_short Structural Characterisation and Mechanical Stability of Titanium Substituted Mesoporous Materials
title_full Structural Characterisation and Mechanical Stability of Titanium Substituted Mesoporous Materials
title_fullStr Structural Characterisation and Mechanical Stability of Titanium Substituted Mesoporous Materials
title_full_unstemmed Structural Characterisation and Mechanical Stability of Titanium Substituted Mesoporous Materials
title_sort Structural Characterisation and Mechanical Stability of Titanium Substituted Mesoporous Materials
author Galacho, Cristina
author_facet Galacho, Cristina
Carrott, Manuela
Valerio, Joana
Carrott, Peter
Valente Nabais, Joao
author_role author
author2 Carrott, Manuela
Valerio, Joana
Carrott, Peter
Valente Nabais, Joao
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Galacho, Cristina
Carrott, Manuela
Valerio, Joana
Carrott, Peter
Valente Nabais, Joao
dc.subject.por.fl_str_mv mechanical stability
titanium
topic mechanical stability
titanium
description Mesoporous silica and titanium SBA-15 samples with different Si/Ti molar ratio were prepared by direct one-step synthesis under strongly acidic hydrothermal conditions. The materials were characterised by X-ray diffraction, nitrogen adsorption at 77K. The Si/Ti values of the final calcined materials were determined by ICP analysis. It was found that all samples presented 2-D hexagonal structures with high degree of ordering. However, the metal content incorporated in all titanium mesoporous materials was very low, i.e., the Si/Ti molar ratio values of the final calcined samples are significantly different from the initial Si/Ti molar ratio in the synthesis gel. A study of mechanical stability in air was performed by exposing the calcined samples to a unidirectional external pressure in the range 74-814MPa. X-ray diffraction and nitrogen adsorption at 77K, on selected compacted samples, were used in order to evaluate the changes in mesoporous structure. It was found that, for all freshly calcined pure silica and titanium containing samples tested, the high quality SBA-15 structure is still observed after the application 148-370MPa of a unidirectional external pressure and the collapse of the pore structure occurs at around 814MPa.
publishDate 2010
dc.date.none.fl_str_mv 2010-01-01T00:00:00Z
2012-11-20T17:34:35Z
2012-11-20
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://hdl.handle.net/10174/5826
http://hdl.handle.net/10174/5826
https://doi.org/10.4028/www.scientific.net/MSF.636-637.136
url http://hdl.handle.net/10174/5826
https://doi.org/10.4028/www.scientific.net/MSF.636-637.136
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Materials Science Forum Vols. 636-637 (2010) pp 136-141
pcg@uevora.pt
manrc@uevora.pt
nd
peter@uevora.pt
jvn@uevora.pt
252
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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dc.publisher.none.fl_str_mv Materials Science Forum
publisher.none.fl_str_mv Materials Science Forum
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
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