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

Sol-gel La2O3-ZrO2 mixed oxide catalysts for

biodiesel production

Daniela Salinas;Catherine Sepúlveda;Néstor Escalona;J.L.GFierro;Gina Pecchi

【期刊名称】《天然气化学（英文版）》 【年(卷),期】2018(027)002

【摘要】Different La2O3 contents (0,1,2,3,and 5 wt％) were used to prepared La2O3-ZrO2 mixed oxides calcined at 600 ℃ 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-ZFO2 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. 【总页数】8页(565-572) 【关键词】