Al-MCM-41负载离子液体双酸位催化剂及制备生物柴油  

Al-MCM-41 Immobilized Ionic Liquids Catalysts Containing Double-Acid Active Sites for Biodiesel Production

作　　者：倪邦庆[1] 黄江磊 张萍波[1] 范明明[1] 

机构地区：[1]江南大学化学与材料工程学院,食品胶体与生物技术教育部重点实验室,无锡214122

出　　处：《无机化学学报》2015年第5期961-967,共7页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21306063);江苏省基础研究计划(No.BK20130123)资助项目

摘　　要：采用不同硅铝比的MCM-41负载离子液体,制备得到一系列负载型双酸位催化剂,并用XRD、FTIR、N2-吸脱附、热重分析及TEM对其进行表征,以大豆油与甲醇的酯交换反应为探针实验考察了其催化活性。结果表明,离子液体成功固载于介孔分子筛并能保持其介孔结构,且在酯交换反应中表现出良好的反应活性。在ILs负载量为30%,醇油物质的量的比为36∶1,140℃下反应5 h,生物柴油收率在90%以上;而分子筛中Al的引入为活性组分离子液体构建了有益的酸环境,促进了其催化活性的提高;与均相离子液体相比,负载型催化剂又能明显提高生物柴油的收率,且回收利用4次后,生物柴油收率仍接近88%。The immobilized catalysts with double-acid active sites were synthesized by loading ionic liquids（ILs）on MCM-41 with different Si/Al molar ratios. The catalysts were characterized by XRD, FTIR, N2 adsorptiondesorption, thermogravimetric analysis and TEM, and the activities of catalysts were investigated by the transesterification of soybean oil with methanol for biodiesel synthesis as the probe reaction. The results demonstrated that the ionic liquids were successfully immobilized on the mesoporous molecular sieves. The catalysts could maintain their mesoporous structure and showed good catalytic performance in transesterification.The biodiesel yield was more than 90% under the condition of 30% ILs-loading, methanol to oil molar ratio of36∶1 and temperature at 140 ℃ for 5 h. The beneficial acid environment was created for the active component ILs by introducing Al to MCM-41, which greatly improved the catalytic performance of ILs. The ILs immobilized catalysts exhibited much higher activities in transesterification than the homogeneous ILs, and the ILs immobilized catalyst still yielded about 88% after four cycles.

关 键 词：催化剂 介孔分子筛 离子液体 负载 生物柴油 酯交换 

分 类 号：O611.65[理学—无机化学]