Phase transition in niobium pentoxide supported on silica-alumina
Autor(a) principal: | |
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Data de Publicação: | 2008 |
Outros Autores: | , , |
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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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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Universidade Federal da Bahia (UFBA) |
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UFBA |
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UFBA |
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Repositório Institucional da UFBA |
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Repositório Institucional da UFBA |
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