Facile synthesis of WOx/ZrO2 catalysts using WO3·H2O precipitate as synthetic precursor of active tungsten species

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.creatorPiva, D. H.-
Autor(es): dc.creatorPiva, R. H.-
Autor(es): dc.creatorPereira, C. A.-
Autor(es): dc.creatorSilva, D. S. A.-
Autor(es): dc.creatorMontedo, O. R. K.-
Autor(es): dc.creatorMorelli, M. R.-
Autor(es): dc.creatorUrquieta-González, E. A.-
Data de aceite: dc.date.accessioned2026-02-09T11:42:07Z-
Data de disponibilização: dc.date.available2026-02-09T11:42:07Z-
Data de envio: dc.date.issued2021-06-11-
Data de envio: dc.date.issued2021-06-11-
Data de envio: dc.date.issued2020-11-
Fonte completa do material: dc.identifierhttps://repositorio.ufla.br/handle/1/46523-
Fonte completa do material: dc.identifierhttps://doi.org/10.1016/j.mtchem.2020.100367-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1145534-
Descrição: dc.descriptionZirconia-supported tungsten oxide (WOx/ZrO2) catalysts were successfully synthesized using a suspension containing amorphous hydrous zirconia precipitates [ZrOx(OH)4-2x·yH2O]n and tungstate monohydrate (WO3·H2O) precipitates. The procedure involved the dissolution of the WO3·H2O precipitate during the aging process with the release of oxyanion [WO4]2- species, interaction of this species with the surface of the [ZrOx(OH)4-2x·yH2O]n precipitate and, formation of active WOx species after thermal treatment. Non-bridging hydroxyl (OH−) groups present in the [ZrOx(OH)4-2x·yH2O]n precipitate act as an active agent for the WO3·H2O dissolution. N2 physisorption, X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), temperature-programmed reduction using hydrogen (H2-TPR), temperature-programmed desorption of ammonia (NH3-TPD), Fourier-transform infrared (FTIR) spectroscopy of adsorbed pyridine, and Raman spectroscopy were used to elucidate the catalyst structure–performance relationship. The catalytic activity was evaluated for the oxidative desulfurization (ODS) of a model fuel containing dibenzothiophene (DBT). For a fixed WO3·H2O content, longer aging times improved the catalyst activity, reaching a maximum when WO3·H2O was completely dissolved. The increase in surface area and formation of more active Zr-WOx clusters and polytungstates are observed for the highest active catalysts. A synergetic effect between local Lewis and Brønsted acid sites seems to have contributed to the observed superior activity. The proposed strategy provides an efficient approach to produce active WOx/ZrO2 catalysts and may be applicable for designing other heterogeneous catalytic systems.-
Idioma: dc.languageen-
Publicador: dc.publisherElsevier-
Direitos: dc.rightsrestrictAccess-
???dc.source???: dc.sourceMaterials Today Chemistry-
Palavras-chave: dc.subjectTungstated zirconia-
Palavras-chave: dc.subjectSynthesis suspension-
Palavras-chave: dc.subjectAging-
Palavras-chave: dc.subjectOxidative desulfurization-
Palavras-chave: dc.subjectPrecursores sintéticos-
Palavras-chave: dc.subjectTungstato de zircônio - Catalisadores-
Palavras-chave: dc.subjectDessulfurização oxidativa-
Título: dc.titleFacile synthesis of WOx/ZrO2 catalysts using WO3·H2O precipitate as synthetic precursor of active tungsten species-
Tipo de arquivo: dc.typeArtigo-
Aparece nas coleções:Repositório Institucional da Universidade Federal de Lavras (RIUFLA)

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