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Please use this identifier to cite or link to this item: http://hdl.handle.net/1843/45415
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dc.creatorMárcio José da Silvapt_BR
dc.creatorNatalia Aparecida Libertopt_BR
dc.creatorLorena Cristina de Andrade Lelespt_BR
dc.creatorUlisses Alves Pereirapt_BR
dc.date.accessioned2022-09-23T13:09:57Z-
dc.date.available2022-09-23T13:09:57Z-
dc.date.issued2016-10-
dc.citation.volume422pt_BR
dc.citation.spage69pt_BR
dc.citation.epage83pt_BR
dc.identifier.doihttps://doi.org/10.1016/j.molcata.2016.03.003pt_BR
dc.identifier.issn1873-314Xpt_BR
dc.identifier.urihttp://hdl.handle.net/1843/45415-
dc.description.resumoIn order to investigate the effect of Lewis acidic metals on the acid properties of Keggin heteropolyacids catalysts, a set of metal-exchanged HPAs (i.e. M3/nPW12O40, M3/nPMo12O40 and M4/nSiW12O40 (M = Cu, Co and Mn, n = 2; M = Fe, n = 3) were synthesized and their activity on glycerol esterification with acetic acid was evaluated. This procedure avoids the use of corrosive Brønsted acid catalysts. Regardless of the heteropoly anion, the activity of catalysts in terms of metal cations followed the sequence: Fe3+> Cu2+> Mn2+> Co2+. It has been found that among the HPAs, only H4SiW12O40 has the acidic protons that can be successfully exchanged with Fe3+ cations, resulting in Fe4(SiW12O40)3 salt, the most active and selective catalyst. The highest conversion (ca.99.9%) was achieved in Fe4(SiW12O40)3-catalyzed esterification reactions, along with the highest selectivity for di and triacetyl glycerol (ca.55 and 42%, respectively). Effects of temperature, stoichiometry of reactants, concentration and nature of catalysts were assessed. A kinetic study of Fe4(SiW12O40)3 or H4SiW12O40-catalyzed reactions was conducted and the activation energy determined.pt_BR
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológicopt_BR
dc.description.sponsorshipFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Geraispt_BR
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superiorpt_BR
dc.description.sponsorshipOutra Agênciapt_BR
dc.languageengpt_BR
dc.publisherUniversidade Federal de Minas Geraispt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.departmentICA - INSTITUTO DE CIÊNCIAS AGRÁRIASpt_BR
dc.publisher.initialsUFMGpt_BR
dc.relation.ispartofJournal of Molecular Catalysis A: Chemicalpt_BR
dc.rightsAcesso Restritopt_BR
dc.subject.otherGlicerinapt_BR
dc.subject.otherCatalisadorespt_BR
dc.subject.otherÉsterespt_BR
dc.subject.otherÁcido acéticopt_BR
dc.titleFe4(SiW12O40)3-catalyzed glycerol acetylation: synthesis of bioadditives by using highly active Lewis acid catalystpt_BR
dc.typeArtigo de Periódicopt_BR
dc.url.externahttps://www.sciencedirect.com/science/article/pii/S138111691630070Xpt_BR
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