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Título: | Solvent-free chromium catalyzed aerobic oxidation of biomass-based alkenes as a route to valuable fragrance compounds. |
Autor(es): | Robles Azocar, Patrícia Alejandra Brandão, Bruno Bitarães Neto Salgado Sousa, Líniker Fabrício de Gusevskaya, Elena Vitalievna |
Palavras-chave: | Monoterpenes Oxidation Oxygen Chromium catalysts Mesoporous molecular sieves |
Data do documento: | 2011 |
Referência: | ROBLES AZOCAR, P. A. et al. Solvent-free chromium catalyzed aerobic oxidation of biomass-based alkenes as a route to valuable fragrance compounds. Applied Catalysis. A, General, v. 47, p. 20-28, 2011. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0926860X11001797>. Acesso em: 02 fev. 2015. |
Resumo: | Chromium 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. |
URI: | http://www.repositorio.ufop.br/handle/123456789/5133 |
DOI: | https://doi.org/10.1016/j.apcata.2011.03.047 |
ISSN: | 0926-860X |
Licença: | O periódico Applied Catalysis A: General concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3581990058792. |
Aparece nas coleções: | DEQUI - Artigos publicados em periódicos |
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