Phase transition in niobium pentoxide supported on silica-alumina

Detalhes bibliográficos
Autor(a) principal: Braga, Valdeilson Souza
Data de Publicação: 2008
Outros Autores: Garcia, Fillipe Augusto da Costa, Dias, José Alves, Dias, Sílvia Cláudia Loureiro
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://www.repositorio.ufba.br/ri/handle/ri/5252
Resumo: p. 851–855
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spelling Braga, Valdeilson SouzaGarcia, Fillipe Augusto da CostaDias, José AlvesDias, Sílvia Cláudia LoureiroBraga, Valdeilson SouzaGarcia, Fillipe Augusto da CostaDias, José AlvesDias, Sílvia Cláudia Loureiro2012-01-25T17:50:31Z2012-01-25T17:50:31Z20081572-8943http://www.repositorio.ufba.br/ri/handle/ri/5252v. 92p. 851–855Nb2O5 supported on SiO2–Al2O3 were prepared with a wide loading range (2, 5, 10, 15, 20 and 25 mass%) and analyzed by simultaneous thermogravimetric (TG) and differential thermal analysis (DTA). The materials presented a phase transition close to 1364°C. This phase transition was studied by XRD, FTIR and Raman spectroscopy. Amixture of orthorhombic (T) andmonoclinic (H and M) crystalline phases was evidenced in the supported samples, which is coverage dependent, in contrast to the formation of only the monoclinic phase (H and M) when pure Nb2O5 is heated under the same conditions. These results indicate the stabilization of Nb2O5 on silica-alumina surface.Submitted by Ana Valéria de Jesus Moura (anavaleria_131@hotmail.com) on 2012-01-25T17:50:31Z No. of bitstreams: 1 fulltext.pdf: 354864 bytes, checksum: fa6f553e0f8817315b9fee4abbdc36db (MD5)Made available in DSpace on 2012-01-25T17:50:31Z (GMT). No. of bitstreams: 1 fulltext.pdf: 354864 bytes, checksum: fa6f553e0f8817315b9fee4abbdc36db (MD5) Previous issue date: 2008niobium pentoxidephase transitionsilica-aluminasupported catalystthermal analysisPhase transition in niobium pentoxide supported on silica-aluminaJournal of Thermal Analysis and Calorimetryinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleengreponame:Repositório Institucional da UFBAinstname:Universidade Federal da Bahia (UFBA)instacron:UFBAinfo:eu-repo/semantics/openAccessORIGINALfulltext.pdffulltext.pdfapplication/pdf354864https://repositorio.ufba.br/bitstream/ri/5252/1/fulltext.pdffa6f553e0f8817315b9fee4abbdc36dbMD51LICENSElicense.txtlicense.txttext/plain1762https://repositorio.ufba.br/bitstream/ri/5252/2/license.txt1b89a9a0548218172d7c829f87a0eab9MD52TEXTfulltext.pdf.txtfulltext.pdf.txtExtracted texttext/plain17472https://repositorio.ufba.br/bitstream/ri/5252/3/fulltext.pdf.txt5d8c2eb31ea38e3b20010619b1f5962aMD53ri/52522022-07-05 14:03:17.27oai:repositorio.ufba.br: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Repositório InstitucionalPUBhttp://192.188.11.11:8080/oai/requestopendoar:19322022-07-05T17:03:17Repositório Institucional da UFBA - Universidade Federal da Bahia (UFBA)false
dc.title.pt_BR.fl_str_mv Phase transition in niobium pentoxide supported on silica-alumina
dc.title.alternative.pt_BR.fl_str_mv Journal of Thermal Analysis and Calorimetry
title Phase transition in niobium pentoxide supported on silica-alumina
spellingShingle Phase transition in niobium pentoxide supported on silica-alumina
Braga, Valdeilson Souza
niobium pentoxide
phase transition
silica-alumina
supported catalyst
thermal analysis
title_short Phase transition in niobium pentoxide supported on silica-alumina
title_full Phase transition in niobium pentoxide supported on silica-alumina
title_fullStr Phase transition in niobium pentoxide supported on silica-alumina
title_full_unstemmed Phase transition in niobium pentoxide supported on silica-alumina
title_sort Phase transition in niobium pentoxide supported on silica-alumina
author Braga, Valdeilson Souza
author_facet Braga, Valdeilson Souza
Garcia, Fillipe Augusto da Costa
Dias, José Alves
Dias, Sílvia Cláudia Loureiro
author_role author
author2 Garcia, Fillipe Augusto da Costa
Dias, José Alves
Dias, Sílvia Cláudia Loureiro
author2_role author
author
author
dc.contributor.author.fl_str_mv Braga, Valdeilson Souza
Garcia, Fillipe Augusto da Costa
Dias, José Alves
Dias, Sílvia Cláudia Loureiro
Braga, Valdeilson Souza
Garcia, Fillipe Augusto da Costa
Dias, José Alves
Dias, Sílvia Cláudia Loureiro
dc.subject.por.fl_str_mv niobium pentoxide
phase transition
silica-alumina
supported catalyst
thermal analysis
topic niobium pentoxide
phase transition
silica-alumina
supported catalyst
thermal analysis
description p. 851–855
publishDate 2008
dc.date.issued.fl_str_mv 2008
dc.date.accessioned.fl_str_mv 2012-01-25T17:50:31Z
dc.date.available.fl_str_mv 2012-01-25T17:50:31Z
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://www.repositorio.ufba.br/ri/handle/ri/5252
dc.identifier.issn.none.fl_str_mv 1572-8943
dc.identifier.number.pt_BR.fl_str_mv v. 92
identifier_str_mv 1572-8943
v. 92
url http://www.repositorio.ufba.br/ri/handle/ri/5252
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFBA
instname:Universidade Federal da Bahia (UFBA)
instacron:UFBA
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reponame_str Repositório Institucional da UFBA
collection Repositório Institucional da UFBA
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