Use este identificador para citar ou linkar para este item:
https://locus.ufv.br//handle/123456789/23226
Tipo: | Artigo |
Título: | Investigation on the esterification of fatty acids catalyzed by the H3PW12O40 heteropolyacid |
Autor(es): | Cardoso, Abiney L. Augusti, Rodinei Silva, Márcio J. Da |
Abstract: | In this work, the H3PW12O40 heteropolyacid (HPW) was employed as a homogeneous catalyst to promote the efficient esterification (ethanolysis) of a number of saturated and unsaturated fatty acids (myristic, palmitic, stearic, oleic, and linoleic) under mild reaction conditions. HPW showed a similar activity to those observed for p-toluene sulfonic acid (PTSA) and sulfuric acid (H2SO4), the other acidic catalysts we compared them with in this study. In the HPW-catalyzed esterification of stearic acid, the addition of water caused a remarkable decrease in the ethyl stearate yields. On the other hand, the increase in the HPW concentration (up to a maximum value) promoted a proportional improvement in the oleic acid to ethyl oleate conversion. Kinetic measurements using oleic acid as a prototype substrate revealed that the esterification reactions catalyzed by HPW, H2SO4, and PTSA are of first-order in relation to the fatty acid concentration. Finally, the catalytic activity of HPW remained unaltered even after several recovery/reutilization cycles whereas the tungsten content in the final product (biodiesel produced by the HPW-catalyzed esterification of oleic acid) was found to be at an acceptably low level (0.0095 mg of W per g of biodiesel). |
Palavras-chave: | Catalytic esterification Heteropolyacids Free fatty acids Biodiesel |
Editor: | Journal of the American Oil Chemists' Society |
Tipo de Acesso: | Open Access |
URI: | https://doi.org/10.1007/s11746-008-1231-0 http://www.locus.ufv.br/handle/123456789/23226 |
Data do documento: | 26-Mar-2008 |
Aparece nas coleções: | Artigos |
Arquivos associados a este item:
Arquivo | Descrição | Tamanho | Formato | |
---|---|---|---|---|
artigo.pdf | Texto completo | 278,4 kB | Adobe PDF | Visualizar/Abrir |
Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.