Abstract
A series of solid base catalysts of 5–20 % KF/La2O3 were prepared via an impregnation method and used in the transesterification of methanol with tributyrin to produce methyl butyrate. Under the suitable reaction conditions (catalyst amount of 30 mg; reaction temperature of 338 K; reaction time of 1.5 h; the molar ratio of methanol to tributyrin of 30), the tributyrin conversion of 99.9 % and the methyl butyrate selectivity of 98.1 % are obtained over 15 % KF/La2O3 catalyst. Furthermore, the recycling experiment was adopted to investigate the stability of the catalyst, and the surface active site of KF/La2O3 catalyst was also discussed. The X-ray diffraction, CO2-TPD and X-ray fluorescence characterization results indicated that LaOF were generated by the interaction of KF with La2O3, which was good for the transesterification of methanol with tributyrin, and the LaOF may be an effective component to reduce the loss of active site, retaining a certain stability of catalyst.
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