Sulfated tin oxide with macro- and mesopores controlled using an integrated sol-gel and surfactant template route

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.creatorAlves-Rosa, Marinalva A. [UNESP]-
Autor(es): dc.creatorVasconcellos, Jonatas Z. [UNESP]-
Autor(es): dc.creatorVieira, Luiz H.-
Autor(es): dc.creatorSantilli, Celso V. [UNESP]-
Autor(es): dc.creatorPulcinelli, Sandra H. [UNESP]-
Data de aceite: dc.date.accessioned2022-02-22T00:32:55Z-
Data de disponibilização: dc.date.available2022-02-22T00:32:55Z-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2019-12-19-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.colsurfa.2019.124012-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/201213-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/201213-
Descrição: dc.descriptionSulfated tin oxide was synthesized by a sol-gel process and pores were formed in the ceramic powders using Pluronic F-127 as a soft template. Sulfate ions linked to the tin oxide promoted the formation of acid sites on the particle surfaces. After calcination, the sulfate ions remained on the oxide particles as uni- and bidentate complexes, so changes in the tin atom coordination numbers at the second shells could be observed by X-ray absorption spectroscopy. The tin oxides showed a cassiterite nanocrystalline structure consisting of aggregates of spherical particles, with crystallite size of around 8 nm, radius of gyration ∼3.7 nm, and mean particle size between 7 and 10 nm, according to X-ray diffraction and small angle X-ray scattering measurements, together with the use of transmission electron microscopy images. The use of Pluronic F-127 as a template for the pores resulted in the formation of meso- and macropores sized around 7.5 nm and 60 μm, respectively, surface area of 128 m2 g−1 and porosities of 71%, after calcination at 500 ºC. The porous sulfated tin oxide was used to catalyze the isopropanol dehydration reaction, with production of propene. The catalytic activity and the temperature-programmed desorption of ammonia confirmed the presence of acid sites on the surface, suggesting that this material could be employed as a heterogeneous catalyst in acid-catalyzed reactions.-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionSão Paulo State University (UNESP) Institute of Chemistry, P.O. Box 355-
Descrição: dc.descriptionUniversity of São Paulo (USP) São Carlos Institute of Chemistry, Av. Trabalhador São-Carlense, 400-
Descrição: dc.descriptionSão Paulo State University (UNESP) Institute of Chemistry, P.O. Box 355-
Descrição: dc.descriptionCNPq: 150427/2015-8-
Descrição: dc.descriptionCNPq: 401679/2013-6-
Descrição: dc.descriptionCAPES: 88887.308370/2018-00-
Idioma: dc.languageen-
Relação: dc.relationColloids and Surfaces A: Physicochemical and Engineering Aspects-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectAcid site-
Palavras-chave: dc.subjectMesopore-
Palavras-chave: dc.subjectSulfate-
Palavras-chave: dc.subjectSurfactant-
Palavras-chave: dc.subjectTin oxide-
Título: dc.titleSulfated tin oxide with macro- and mesopores controlled using an integrated sol-gel and surfactant template route-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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