| dc.creator | Cardoso, Abiney L. | |
| dc.creator | Augusti, Rodinei | |
| dc.creator | Silva, Márcio J. Da | |
| dc.date | 2019-01-29T09:51:48Z | |
| dc.date | 2019-01-29T09:51:48Z | |
| dc.date | 2008-03-26 | |
| dc.date.accessioned | 2023-09-27T22:21:46Z | |
| dc.date.available | 2023-09-27T22:21:46Z | |
| dc.identifier | 1558-9331 | |
| dc.identifier | https://doi.org/10.1007/s11746-008-1231-0 | |
| dc.identifier | http://www.locus.ufv.br/handle/123456789/23226 | |
| dc.identifier.uri | https://repositorioslatinoamericanos.uchile.cl/handle/2250/8974133 | |
| dc.description | 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). | |
| dc.format | pdf | |
| dc.format | application/pdf | |
| dc.language | eng | |
| dc.publisher | Journal of the American Oil Chemists' Society | |
| dc.relation | Volume 85, Issue 6, Pages 555–560, June 2008 | |
| dc.rights | Open Access | |
| dc.subject | Catalytic esterification | |
| dc.subject | Heteropolyacids | |
| dc.subject | Free fatty acids | |
| dc.subject | Biodiesel | |
| dc.title | Investigation on the esterification of fatty acids catalyzed by the H3PW12O40 heteropolyacid | |
| dc.type | Artigo | |
