SO_4^(2-)/TiO_2-ZrO_2固体酸催化乌桕籽油制备生物柴油的研究

Biodiesel preparation from stillingia oil by SO_4^(2-)/TiO_2-ZrO_2 solid acid catalyst

乌桕籽油是一种可再生的木本植物油料,可与甲醇发生酯交换反应制得生物柴油。试验表明,固体酸催化剂SO42-/TiO2-ZrO2对乌桕籽油酯交换反应表现出了较高的催化活性,当反应温度为150℃、醇油物质的量比为12∶1、催化剂用量为乌桕籽油质量的5%、反应时间为6h时,乌桕籽油的酯化率达到95%以上,催化剂重复和再生使用效果良好。同时,对该催化剂的SEM,TEM,XRD,BET结构表征表明,该催化剂表面呈多孔状,颗粒大小分布在10～100nm,比表面积为114m2/g,是一种纳米固体催化剂。

Stillingia oil is a kind of renewable woody plant oils, which can be used to produce biodiesel by the transesterification with methanol.The results showed that SO42-/TiO2-ZrO2 solid acid can be used as catalyst directly at high catalysis activity and can be brought about a conversion rate of over 95% for Stillingia oil under the transesterification conditions of 150 ℃, the methanol to oil molar ratio of 12∶1, the catalyst amount of 5% and the reaction time of 6 h.The experiments also revealed that the SO42-/TiO2-ZrO2 catalyst had good repetitious and reproducible stability.The evidences of SEM,TEM,XRD,BET show that the catalyst has a porous structure with 10～100 nm dimension and 114 m2/g surface area, and is a nano meter solid catalyst.