固体酸SO_4^(2-)/ZrO_2-CeO_2催化小桐子油脂肪酸制备生物柴油的实验研究

Biodiesel production from Jatropha curcas L.fatty acids using solid acid SO_4^(2-)/ZrO_2-CeO_2 as catalyst

用沉淀浸渍法制备了固体酸催化剂SO42-/ZrO2-CeO2,用于催化小桐籽油脂肪酸与甲醇酯化制备生物柴油。考察了焙烧温度和CeO2负载量对催化剂活性的影响,并进行了单因素实验和动力学研究。研究表明,SO42-/ZrO2-CeO2有较高的催化活性,当甲醇与脂肪酸体积比2∶1,反应温度150℃,催化剂用量为脂肪酸质量的8%,反应60 min时,脂肪酸转化率可达0.940 3。动力学计算表明,该酯化反应的表观活化能为45.31 kJ/mol,动力学模型为-dcA/dt=38 371e-45310/RTcA1.44。

Solid acid SO42-/ZrO2-CeO2 was prepared by co-precipitation impregnation method,which was used as catalyst for biodiesel production from Jatropha curcas L.fatty acids with methanol.Effects of CeO2 loading and calcination temperature on performance of the catalyst were examined;besides,single factor experiments and kinetics were also studied.The results show that SO42-/ZrO2-CeO2has higher catalytic activity.The conversion of fatty acids reaches 0.940 3 at 150 ℃ in 60 min when the weight ratio of catalyst to fatty acids is 8% and the volume ratio of methanol to acids is 2∶1.The kinetics calculation indicates that the apparent activation energy is 45.31 kJ/mol,and kinetic model is-dcA/dt=38 371e-45310/RTc1.44A.