Caracterização textural e estrutural de V 2O 5/TiO 2 obtidos via sol-gel: Comparação entre secagem convencional e supercrítica

Detalhes bibliográficos
Autor(a) principal: Rodella, Cristiane B.
Data de Publicação: 2002
Outros Autores: Nunes, Luis A. O., Saeki, Margarida Juri [UNESP], Padilha, Pedro M. [UNESP], Florentino, Ariovaldo O. [UNESP]
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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spelling 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

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