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Advisor(s)
Abstract(s)
This paper, reports experimental work on the use of new heterogeneous solid basic catalysts for biodiesel production: double oxides of Mg and Al, produced by calcination, at high temperature, of MgAl lamellar structures, the hydrotalcites (HT). The most suitable catalyst system studied are hydrotalcite Mg:Al 2:1 calcinated at 507 degrees C and 700 degrees C, leading to higher values of FAME also in the second reaction stage. One of the prepared catalysts resulted in 97.1% Fatty acids methyl esters (FAME) in the 1st reaction step, 92.2% FAME in the 2nd reaction step and 34% FAME in the 3rd reaction step. The biodiesel obtained in the transesterification reaction showed composition and quality parameters within the limits specified by the European Standard EN 14214. 2.5% wt catalyst/oil and a molar ratio methanol:oil of 9:1 or 12:1 at 60 -65 degrees C and 4 h of reaction time are the best operating conditions achieved in this study. This study showed the potential of Mg/Al hydrotalcites as heterogeneous catalysts for biodiesel production. (C) 2011 Elsevier Ltd. All rights reserved.
Description
Keywords
Biodiesel Hydrotalcites Heterogeneous catalysts Near-infrared spectroscopy Layered double hydroxides Transesterification Triglycerides Al Quality Oxides Fuel Oil
Citation
GOMES, João F. P.; PUNA, Jaime F. B.; GONÇALVES, Lissa M.; BORDADO, João C. M. - Study on the use of MgAl hydrotalcites as solid heterogeneous catalysts for biodiesel production. Energy. ISSN 0360-5442. Vol. 36, n.º 12 (2011) p. 6770-6778.