Solvent-free chromium catalyzed aerobic oxidation of biomass-based alkenes as a route to valuable fragrance compounds.

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MetadadosDescriçãoIdioma
Autor(es): dc.creatorDutenhefner, Patricia Alejandra Robles-
Autor(es): dc.creatorBrandão, Bruno Bitarães Neto Salgado-
Autor(es): dc.creatorSousa, Líniker Fabrício de-
Autor(es): dc.creatorGoussevskaia, Elena Vitalievna-
Data de aceite: dc.date.accessioned2019-11-06T13:33:48Z-
Data de disponibilização: dc.date.available2019-11-06T13:33:48Z-
Data de envio: dc.date.issued2015-04-17-
Data de envio: dc.date.issued2015-04-17-
Data de envio: dc.date.issued2011-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/handle/123456789/5133-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/558148-
Descrição: dc.descriptionChromium containing mesoporous molecular sieves MCM-41 were shown to be an efficient heterogeneous catalyst for the liquid-phase aerobic oxidation of various monoterpenic alkenes under mild solvent-free conditions. The material was prepared through a direct hydrothermal method and characterized by ICP-AES,N2 adsorption–desorption, TEM, XRD, SAXS, andH2-TPR techniques. Characterizations suggest that chromium introduced in MCM-41 is essentially incorporated in the silica framework, with no extraframework chromium oxides being detected. Various oxygenated monoterpenoids important for the flavor and fragrance industry were obtained with high combined selectivities (75–92%) at 30–40% substrate conversions. The oxidation of _-pinene led almost exclusively to allylic mono-oxygenated derivatives, whereas limonene and _-pinene gave both epoxides and allylic oxidation products. The catalyst undergoes no metal leaching and can be easily recovered and re-used. A silica-included chromium catalyst prepared through a conventional sol–gel method showed activity comparable with that of Cr- MCM-41; however, selectivity was much lower.-
Idioma: dc.languageen-
Direitos: dc.rightsO Periódico Applied Catalysis A: General concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3581990058792.-
Palavras-chave: dc.subjectMonoterpenes-
Palavras-chave: dc.subjectOxidation-
Palavras-chave: dc.subjectOxygen-
Palavras-chave: dc.subjectChromium catalysts-
Palavras-chave: dc.subjectMesoporous molecular sieves-
Título: dc.titleSolvent-free chromium catalyzed aerobic oxidation of biomass-based alkenes as a route to valuable fragrance compounds.-
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