【摘要】 采用化学键联的方式将磷钨酸离子液体([BsAIm]₃[PW₁₂O₄₀])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][PW₁₂O₄₀]-PSP-SiO₂),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。更多还原

【Abstract】 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.更多还原