Pontificia Universidad Católica de Chile Pontificia Universidad Católica de Chile
Salinas D., Sepúlveda C., Escalona N., Fierro J.L.G. and Pecchi G. (2018)

Sol–gel La2O3–ZrO2 mixed oxide catalysts for biodiesel production

Revista : Journal of Energy Chemistry
Volumen : 27
Número : 2
Páginas : 565-572
Tipo de publicación : ISI Ir a publicación


Different La2O3 contents (0, 1, 2, 3, and 5 wt%) were used to prepared La2O3-ZrO2 mixed oxides calcined at 600°C by the sol-gel method. The catalytic activity was measured as biodiesel production from canola oil through a transesterification reaction. The characterization results indicate that the La2O3 monolayer formation and extent of basicity of m-ZrO2 have a large influence on biodiesel production. Greater biodiesel conversion (56% at 4 h) was obtained with the 3% La2O3-ZrO2 catalyst in the presence of basic sites and the formation of a monolayer of La2O3. The decrease in the catalytic activity for 5% La2O3-ZrO2 resulted from the loss of active sites on the catalyst because of agglomeration, which was suggested by XPS and the isoelectric point. The kinetic data fit to a pseudo-first order constant, and the largest kinetic constant corresponds to 3% La2O3-ZrO2, currently the largest heterogeneous non-alkaline metal catalyst reported for a transesterification reaction.