Oxidation of terpenic alcohols with hydrogen peroxide promoted by Nb2O5 obtained by microwave-assisted hydrothermal method.

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dc.contributor.authorBatalha, Daniel Carreira
dc.contributor.authorMarins, Natália Hadler
dc.contributor.authorSilva, Ricardo Marques e
dc.contributor.authorCarreño, Neftalí Lenin Villarreal
dc.contributor.authorFajardo, Humberto Vieira
dc.contributor.authorSilva, Márcio José da
dc.date.accessioned2021-12-13T21:35:03Z
dc.date.available2021-12-13T21:35:03Z
dc.date.issued2020pt_BR
dc.description.abstractThe present work describes the synthesis of niobium oxides by microwave-assisted hydrothermal method and their evaluation as a solid catalyst in oxidation reactions of terpenic alcohols with hydrogen peroxide. Effects of main parameters of synthesis were assessed and all the prepared catalysts were characterized by physical adsorption/ desorption analyses of nitrogen, infrared and Raman spectroscopies, scanning electron microscopy and powder X-rays diffraction analyses. The strength and number of acidic sites of the catalysts were determined by potentiometric titration. Morphological and structural characterization corroborate with the activity and selectivity achieved by the niobium oxides. The reusability of the catalyst was evaluated. The impacts of main reaction variables such as temperature, catalyst, and oxidant load were assessed. Niobium oxide demonstrated to be an effective catalyst, selectively converting the nerol (model molecule) to epoxide and aldehyde. Oxidation of various terpenic alcohols was investigated. Only geraniol and nerol were selectively epoxidized, suggesting a hydroxyl group assisted reaction. Although being also allylic alcohol, linalool was unreactive toward epoxidation due to the presence of a methyl group at the same carbon atom than the hydroxy group. The use of an environmentally cheap friendly oxidant (H2O2) and efficient solid catalyst (Nb2O5) are positive aspects of this process.pt_BR
dc.identifier.citationBATALHA, D. C. et al. Oxidation of terpenic alcohols with hydrogen peroxide promoted by Nb2O5 obtained by microwave-assisted hydrothermal method. Molecular Catalysis, v. 489, artigo 110941, 2020. Disponível em: <https://www.sciencedirect.com/science/article/abs/pii/S2468823120301966>. Acesso em: 10 jun. 2021.pt_BR
dc.identifier.doihttps://doi.org/10.1016/j.mcat.2020.110941pt_BR
dc.identifier.issn2468-8231
dc.identifier.urihttp://www.repositorio.ufop.br/jspui/handle/123456789/14213
dc.identifier.uri2https://www.sciencedirect.com/science/article/abs/pii/S2468823120301966pt_BR
dc.language.isoen_USpt_BR
dc.rightsrestritopt_BR
dc.subjectNiobium oxidept_BR
dc.subjectHeterogeneous catalysispt_BR
dc.subjectNerolpt_BR
dc.titleOxidation of terpenic alcohols with hydrogen peroxide promoted by Nb2O5 obtained by microwave-assisted hydrothermal method.pt_BR
dc.typeArtigo publicado em periodicopt_BR
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