Caracterização textural e estrutural de V 2O 5/TiO 2 obtidos via sol-gel: Comparação entre secagem convencional e supercrítica
Autor(a) principal: | |
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Data de Publicação: | 2002 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1590/S0100-40422002000200007 http://hdl.handle.net/11449/66838 |
Resumo: | This work describes a modified sol-gel method for the preparation of V 2O 5/TiO 2 catalysts. The samples have been characterized by N 2 adsorption at 77K, x-ray diffractometry (XRD) and Fourier Transform Infrared (FT-IR). The surface area increases with the vanadia loading from 24 m 2 g -1, for pure TiO 2, to 87 m 2 g -1 for 9wt.% of V 2O 5. The rutile form is predominant for pure TiO 2 but became enriched with anatase phase when vanadia loading is increased. No crystalline V 2O 5 phase was observed in the catalysts diffractograms. Two species of surface vanadium observed by FT-IR spectroscopy a monomeric vanadyl and polymeric vanadates, the vanadyl/vanadate ratio remains practically constant. |
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Repositório Institucional da UNESP |
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Caracterização textural e estrutural de V 2O 5/TiO 2 obtidos via sol-gel: Comparação entre secagem convencional e supercríticaTextural and structural characterization of V 2O 5/TiO 2 catalysts obtained by the sol-gel method: Comparison between conventional and supercritical dryingCatalystSol-gelVanadium and titanium oxidemonomernitrogenpolymertitanium dioxidevanadic acidvanadium derivativevanadium pentoxidevanadyl derivativeadsorptioncatalystcrystallizationgelinfrared spectroscopyintermethod comparisonmethodologyphase transitionspecies differentiationsurface propertyX ray diffractionThis work describes a modified sol-gel method for the preparation of V 2O 5/TiO 2 catalysts. The samples have been characterized by N 2 adsorption at 77K, x-ray diffractometry (XRD) and Fourier Transform Infrared (FT-IR). The surface area increases with the vanadia loading from 24 m 2 g -1, for pure TiO 2, to 87 m 2 g -1 for 9wt.% of V 2O 5. The rutile form is predominant for pure TiO 2 but became enriched with anatase phase when vanadia loading is increased. No crystalline V 2O 5 phase was observed in the catalysts diffractograms. Two species of surface vanadium observed by FT-IR spectroscopy a monomeric vanadyl and polymeric vanadates, the vanadyl/vanadate ratio remains practically constant.Instituto de Física de São Carlos Universidade de São Paulo, CP 369, 13560-970 São Carlos - SPDepartamento de Química Faculdade de Ciências Universidade Estadual Paulista Júlio de Mesquita Filho, CP 473, 17001-970 Bauru - SPDepartamento de Química e Bioquímica Instituto de Bioquímica Universidade Estadual Paulista Júlio de Mesquita Filho, CP 510, 18618-000 Botucatu - SPDepartamento de Química Faculdade de Ciências Universidade Estadual Paulista Júlio de Mesquita Filho, CP 473, 17001-970 Bauru - SPDepartamento de Química e Bioquímica Instituto de Bioquímica Universidade Estadual Paulista Júlio de Mesquita Filho, CP 510, 18618-000 Botucatu - SPUniversidade de São Paulo (USP)Universidade Estadual Paulista (Unesp)Rodella, Cristiane B.Nunes, Luis A. O.Saeki, Margarida Juri [UNESP]Padilha, Pedro M. [UNESP]Florentino, Ariovaldo O. [UNESP]2014-05-27T11:20:25Z2014-05-27T11:20:25Z2002-03-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article209-213application/pdfhttp://dx.doi.org/10.1590/S0100-40422002000200007Quimica Nova, v. 25, n. 2, p. 209-213, 2002.0100-4042http://hdl.handle.net/11449/6683810.1590/S0100-40422002000200007S0100-40422002000200007WOS:0001746921000072-s2.0-00365197682-s2.0-0036519768.pdf698144863745639118029828064368940000-0003-4179-0574Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPporQuímica Nova0.6460,255info:eu-repo/semantics/openAccess2024-04-29T18:17:21Zoai:repositorio.unesp.br:11449/66838Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T22:44:47.571725Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Caracterização textural e estrutural de V 2O 5/TiO 2 obtidos via sol-gel: Comparação entre secagem convencional e supercrítica Textural and structural characterization of V 2O 5/TiO 2 catalysts obtained by the sol-gel method: Comparison between conventional and supercritical drying |
title |
Caracterização textural e estrutural de V 2O 5/TiO 2 obtidos via sol-gel: Comparação entre secagem convencional e supercrítica |
spellingShingle |
Caracterização textural e estrutural de V 2O 5/TiO 2 obtidos via sol-gel: Comparação entre secagem convencional e supercrítica Rodella, Cristiane B. Catalyst Sol-gel Vanadium and titanium oxide monomer nitrogen polymer titanium dioxide vanadic acid vanadium derivative vanadium pentoxide vanadyl derivative adsorption catalyst crystallization gel infrared spectroscopy intermethod comparison methodology phase transition species differentiation surface property X ray diffraction |
title_short |
Caracterização textural e estrutural de V 2O 5/TiO 2 obtidos via sol-gel: Comparação entre secagem convencional e supercrítica |
title_full |
Caracterização textural e estrutural de V 2O 5/TiO 2 obtidos via sol-gel: Comparação entre secagem convencional e supercrítica |
title_fullStr |
Caracterização textural e estrutural de V 2O 5/TiO 2 obtidos via sol-gel: Comparação entre secagem convencional e supercrítica |
title_full_unstemmed |
Caracterização textural e estrutural de V 2O 5/TiO 2 obtidos via sol-gel: Comparação entre secagem convencional e supercrítica |
title_sort |
Caracterização textural e estrutural de V 2O 5/TiO 2 obtidos via sol-gel: Comparação entre secagem convencional e supercrítica |
author |
Rodella, Cristiane B. |
author_facet |
Rodella, Cristiane B. Nunes, Luis A. O. Saeki, Margarida Juri [UNESP] Padilha, Pedro M. [UNESP] Florentino, Ariovaldo O. [UNESP] |
author_role |
author |
author2 |
Nunes, Luis A. O. Saeki, Margarida Juri [UNESP] Padilha, Pedro M. [UNESP] Florentino, Ariovaldo O. [UNESP] |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade de São Paulo (USP) Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Rodella, Cristiane B. Nunes, Luis A. O. Saeki, Margarida Juri [UNESP] Padilha, Pedro M. [UNESP] Florentino, Ariovaldo O. [UNESP] |
dc.subject.por.fl_str_mv |
Catalyst Sol-gel Vanadium and titanium oxide monomer nitrogen polymer titanium dioxide vanadic acid vanadium derivative vanadium pentoxide vanadyl derivative adsorption catalyst crystallization gel infrared spectroscopy intermethod comparison methodology phase transition species differentiation surface property X ray diffraction |
topic |
Catalyst Sol-gel Vanadium and titanium oxide monomer nitrogen polymer titanium dioxide vanadic acid vanadium derivative vanadium pentoxide vanadyl derivative adsorption catalyst crystallization gel infrared spectroscopy intermethod comparison methodology phase transition species differentiation surface property X ray diffraction |
description |
This work describes a modified sol-gel method for the preparation of V 2O 5/TiO 2 catalysts. The samples have been characterized by N 2 adsorption at 77K, x-ray diffractometry (XRD) and Fourier Transform Infrared (FT-IR). The surface area increases with the vanadia loading from 24 m 2 g -1, for pure TiO 2, to 87 m 2 g -1 for 9wt.% of V 2O 5. The rutile form is predominant for pure TiO 2 but became enriched with anatase phase when vanadia loading is increased. No crystalline V 2O 5 phase was observed in the catalysts diffractograms. Two species of surface vanadium observed by FT-IR spectroscopy a monomeric vanadyl and polymeric vanadates, the vanadyl/vanadate ratio remains practically constant. |
publishDate |
2002 |
dc.date.none.fl_str_mv |
2002-03-01 2014-05-27T11:20:25Z 2014-05-27T11:20:25Z |
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://dx.doi.org/10.1590/S0100-40422002000200007 Quimica Nova, v. 25, n. 2, p. 209-213, 2002. 0100-4042 http://hdl.handle.net/11449/66838 10.1590/S0100-40422002000200007 S0100-40422002000200007 WOS:000174692100007 2-s2.0-0036519768 2-s2.0-0036519768.pdf 6981448637456391 1802982806436894 0000-0003-4179-0574 |
url |
http://dx.doi.org/10.1590/S0100-40422002000200007 http://hdl.handle.net/11449/66838 |
identifier_str_mv |
Quimica Nova, v. 25, n. 2, p. 209-213, 2002. 0100-4042 10.1590/S0100-40422002000200007 S0100-40422002000200007 WOS:000174692100007 2-s2.0-0036519768 2-s2.0-0036519768.pdf 6981448637456391 1802982806436894 0000-0003-4179-0574 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
Química Nova 0.646 0,255 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
209-213 application/pdf |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808129457519591424 |