Studies on dispersion and reactivity of vanadium oxides deposited on lamellar ferrierite zeolites for condensation of glycerol into bulky products
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.mcat.2017.11.027 http://hdl.handle.net/11449/179733 |
Resumo: | The acetalization of acetone with glycerol was investigated using vanadium-impregnated catalysts. The siliceous supports FER, a purely microporous material, and ITQ-6, a micro/mesoporous material, were obtained from a ferrierite lamellar precursor, PreFER. Both supports were impregnated with 1, 5 or 10 wt.% of vanadium. The structural properties were characterized by X-ray diffraction and N2 adsorption/desorption, the dispersion and speciation of surface vanadium were analyzed by diffuse reflectance UV–vis spectroscopy and X-ray absorption spectroscopy (XANES and EXAFS), and the total acidities of the catalysts were evaluated by temperature-programmed NH3 desorption. The [5V]Si-ITQ-6 and [10V]Si-ITQ-6 catalysts provided the best catalytic results, with conversions of 100 and 90%, respectively, and selectivity towards solketal of approximately 99%. The higher surface area generated by mesoporosity in the Si-ITQ-6 support, compared to the microporous Si-FER support, provided good access for the diffusion of reactants and products, and good dispersion of vanadium, even at high vanadium loadings (10 wt.%), with preferential formation of VO4 monomers and VOx oligomers on the surface. The greater contributions of these species to the total acidities of the catalysts resulted in higher catalytic activities, compared to the effect of V2O5 agglomerates. |
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Studies on dispersion and reactivity of vanadium oxides deposited on lamellar ferrierite zeolites for condensation of glycerol into bulky productsFER structureGlycerol condensationLamellar zeolitesSolketalVanadiumThe acetalization of acetone with glycerol was investigated using vanadium-impregnated catalysts. The siliceous supports FER, a purely microporous material, and ITQ-6, a micro/mesoporous material, were obtained from a ferrierite lamellar precursor, PreFER. Both supports were impregnated with 1, 5 or 10 wt.% of vanadium. The structural properties were characterized by X-ray diffraction and N2 adsorption/desorption, the dispersion and speciation of surface vanadium were analyzed by diffuse reflectance UV–vis spectroscopy and X-ray absorption spectroscopy (XANES and EXAFS), and the total acidities of the catalysts were evaluated by temperature-programmed NH3 desorption. The [5V]Si-ITQ-6 and [10V]Si-ITQ-6 catalysts provided the best catalytic results, with conversions of 100 and 90%, respectively, and selectivity towards solketal of approximately 99%. The higher surface area generated by mesoporosity in the Si-ITQ-6 support, compared to the microporous Si-FER support, provided good access for the diffusion of reactants and products, and good dispersion of vanadium, even at high vanadium loadings (10 wt.%), with preferential formation of VO4 monomers and VOx oligomers on the surface. The greater contributions of these species to the total acidities of the catalysts resulted in higher catalytic activities, compared to the effect of V2O5 agglomerates.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Instituto de Química UNESP – Univ. Estadual Paulista, Rua Prof. Francisco Degni 55Instituto de Química UNESP – Univ. Estadual Paulista, Rua Prof. Francisco Degni 55CNPq: #304698/2014-8Universidade Estadual Paulista (Unesp)Vieira, Luiz H. [UNESP]Possato, Luiz G. [UNESP]Chaves, Thiago F. [UNESP]Pulcinelli, Sandra H. [UNESP]Santilli, Celso V. [UNESP]Martins, Leandro [UNESP]2018-12-11T17:36:32Z2018-12-11T17:36:32Z2018-10-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article161-170application/pdfhttp://dx.doi.org/10.1016/j.mcat.2017.11.027Molecular Catalysis, v. 458, p. 161-170.2468-8231http://hdl.handle.net/11449/17973310.1016/j.mcat.2017.11.0272-s2.0-850447394062-s2.0-85044739406.pdf578269656560234055842986818708650000-0002-8356-8093Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengMolecular Catalysis1,069info:eu-repo/semantics/openAccess2023-10-03T06:03:31Zoai:repositorio.unesp.br:11449/179733Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T13:52:59.589772Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Studies on dispersion and reactivity of vanadium oxides deposited on lamellar ferrierite zeolites for condensation of glycerol into bulky products |
title |
Studies on dispersion and reactivity of vanadium oxides deposited on lamellar ferrierite zeolites for condensation of glycerol into bulky products |
spellingShingle |
Studies on dispersion and reactivity of vanadium oxides deposited on lamellar ferrierite zeolites for condensation of glycerol into bulky products Vieira, Luiz H. [UNESP] FER structure Glycerol condensation Lamellar zeolites Solketal Vanadium |
title_short |
Studies on dispersion and reactivity of vanadium oxides deposited on lamellar ferrierite zeolites for condensation of glycerol into bulky products |
title_full |
Studies on dispersion and reactivity of vanadium oxides deposited on lamellar ferrierite zeolites for condensation of glycerol into bulky products |
title_fullStr |
Studies on dispersion and reactivity of vanadium oxides deposited on lamellar ferrierite zeolites for condensation of glycerol into bulky products |
title_full_unstemmed |
Studies on dispersion and reactivity of vanadium oxides deposited on lamellar ferrierite zeolites for condensation of glycerol into bulky products |
title_sort |
Studies on dispersion and reactivity of vanadium oxides deposited on lamellar ferrierite zeolites for condensation of glycerol into bulky products |
author |
Vieira, Luiz H. [UNESP] |
author_facet |
Vieira, Luiz H. [UNESP] Possato, Luiz G. [UNESP] Chaves, Thiago F. [UNESP] Pulcinelli, Sandra H. [UNESP] Santilli, Celso V. [UNESP] Martins, Leandro [UNESP] |
author_role |
author |
author2 |
Possato, Luiz G. [UNESP] Chaves, Thiago F. [UNESP] Pulcinelli, Sandra H. [UNESP] Santilli, Celso V. [UNESP] Martins, Leandro [UNESP] |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Vieira, Luiz H. [UNESP] Possato, Luiz G. [UNESP] Chaves, Thiago F. [UNESP] Pulcinelli, Sandra H. [UNESP] Santilli, Celso V. [UNESP] Martins, Leandro [UNESP] |
dc.subject.por.fl_str_mv |
FER structure Glycerol condensation Lamellar zeolites Solketal Vanadium |
topic |
FER structure Glycerol condensation Lamellar zeolites Solketal Vanadium |
description |
The acetalization of acetone with glycerol was investigated using vanadium-impregnated catalysts. The siliceous supports FER, a purely microporous material, and ITQ-6, a micro/mesoporous material, were obtained from a ferrierite lamellar precursor, PreFER. Both supports were impregnated with 1, 5 or 10 wt.% of vanadium. The structural properties were characterized by X-ray diffraction and N2 adsorption/desorption, the dispersion and speciation of surface vanadium were analyzed by diffuse reflectance UV–vis spectroscopy and X-ray absorption spectroscopy (XANES and EXAFS), and the total acidities of the catalysts were evaluated by temperature-programmed NH3 desorption. The [5V]Si-ITQ-6 and [10V]Si-ITQ-6 catalysts provided the best catalytic results, with conversions of 100 and 90%, respectively, and selectivity towards solketal of approximately 99%. The higher surface area generated by mesoporosity in the Si-ITQ-6 support, compared to the microporous Si-FER support, provided good access for the diffusion of reactants and products, and good dispersion of vanadium, even at high vanadium loadings (10 wt.%), with preferential formation of VO4 monomers and VOx oligomers on the surface. The greater contributions of these species to the total acidities of the catalysts resulted in higher catalytic activities, compared to the effect of V2O5 agglomerates. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-12-11T17:36:32Z 2018-12-11T17:36:32Z 2018-10-01 |
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/10.1016/j.mcat.2017.11.027 Molecular Catalysis, v. 458, p. 161-170. 2468-8231 http://hdl.handle.net/11449/179733 10.1016/j.mcat.2017.11.027 2-s2.0-85044739406 2-s2.0-85044739406.pdf 5782696565602340 5584298681870865 0000-0002-8356-8093 |
url |
http://dx.doi.org/10.1016/j.mcat.2017.11.027 http://hdl.handle.net/11449/179733 |
identifier_str_mv |
Molecular Catalysis, v. 458, p. 161-170. 2468-8231 10.1016/j.mcat.2017.11.027 2-s2.0-85044739406 2-s2.0-85044739406.pdf 5782696565602340 5584298681870865 0000-0002-8356-8093 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Molecular Catalysis 1,069 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
161-170 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_ |
1808128286177361920 |