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《Journal of Beijing University of Chemical Technology(Natural Science Edition)》 2007-05
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Synthesis of biodiesel catalyzed by an S_2O_8~(2-)/Fe_2O_3-ZrO_2-La_2O_3 solid superacid

WANG ZhiHua1 SUN XiaoMan1 SUN GuiFang2 LIU GuoWen2 (1.State Key Laboratory of Chemical Resource Engineering,Beijing University of Chemical Technology,Beijing 100029;2.Beijing Feiyan Petrochemical Environmental Protection Science and Technology Development Company Limited,Beijing 102500,China)  
Biodiesel has been synthesized from vegetable seed oil and methanol using an S2O2-8/Fe2O3-ZrO2-La2O3 solid superacid catalyst in a pressure kettle.The S2O2-8/Fe2O3-ZrO2-La2O3 solid superacid was prepared by a precipitation-impregnation method and was characterized by XRD and FTIR.The effects of catalyst synthesis and transesterification conditions on the yield of biodiesel were investigated.The results showed that the maximum biodiesel yield of 90.3% was obtained when the Fe/Zr/La atom molar ratio in the catalyst was 1∶0.42∶0.075.The optimum transesterification reaction conditions were as follows: reaction temperature 220 ℃,molar ratio of methanol to oil 12∶1,reaction time 10 h and a catalyst quantity of 2.0% relative to the vegetable seed oil.The biodiesel yield decreased from 90.3% to 83.0% after the catalysts were reused for five successive 10 h periods.GC-MS characterization of the biodiesel indicated that its purity was relatively high.
【CateGory Index】: TE667
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