硅胶负载磷钨酸离子液体催化剂的制备及其催化合成生物柴油的性能  

Preparation of tungstophosphoric anion based ionic liquids supported on silica and their catalytic activity for biodiesel synthesis

作　　者：李原[1,2] 甄彬[1] 黎汉生[1] 

机构地区：[1]北京理工大学化工与环境学院,北京100081 [2]昆明理工大学分析测试研究中心,云南昆明650093

出　　处：《工业催化》2011年第12期27-31,共5页Industrial Catalysis

基　　金：国家自然科学基金(20976013)资助项目

摘　　要：采用化学键联的方式将磷钨酸离子液体([BsAIm]_3[PW_(12)O_(40)])负载于硅胶表面,合成3种不同键合密度的硅胶负载磷钨酸离子液体固体酸催化剂([BsAIm][PW_(12)O_(40)]-PSP-SiO_2),采用紫外分光光度法、红外光谱、核磁共振、热重-差热分析、元素分析和氮气物理吸附等方法对其结构进行表征,并考察催化剂催化油酸酯化制备生物柴油的催化性能及键合密度对催化性能的影响。结果表明,成功制备了化学键联型硅胶负载磷钨酸离子液体催化剂,催化剂在250℃以下稳定,催化油酸酯化制备生物柴油的过程中具有良好的催化活性,油酸转化率达到48.49%,其比表面积、孔容和活性随键合密度的增大而降低。By grafting tungstophosphoric anion based ionic liquid [ BsAIm] 3 [ PW12O40 ] on the surface of silica, three kinds of chemical bond-typed solid acidic catalysts with different bonding density were prepared. The structure of these catalysts were characterized by UV spectrophotometry, FT-IR, ^1H NMR, TG-DTA,elemental analysis, and N2 adsorption. The catalytic activity was evaluated by esterification of oleic acid to biodiesel. The results showed that tungstophosphoric anion based ionic liquid supported on silica exhibited good stability below 250 ℃ and good catalytic activity in the preparation process of biodiesel; oleic acid conversion of 48.49% was attained. Their catalytic activity, specific surface area and pore volume decreased with the increase of bonding density.

关 键 词：催化化学 硅胶 磷钨酸离子液体 酯化反应 生物柴油 

分 类 号：O643.36[理学—物理化学] TE667[理学—化学]