Structural Characterisation and Mechanical Stability of Titanium Substituted Mesoporous Materials
Autor(a) principal: | |
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Data de Publicação: | 2010 |
Outros Autores: | , , , |
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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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 |
eu_rights_str_mv |
openAccess |
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 instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799136491662737408 |