新型硅钨酸有机盐的合成及催化油酸酯化  

Preparation and Catalytic Esterification Activity of Novel Organic-silicotungstate

作　　者：栾庆洁 李思佳 刘丽君[1] 龚树文[1] 

机构地区：[1]聊城大学化学化工学院功能有机分子与材料实验室

出　　处：《化学试剂》2018年第3期207-211,共5页Chemical Reagents

基　　金：国家自然科学基金资助项目(21101086);山东省自然科学基金资助项目(ZR2017MB060);山东省优秀中青年科学家科研奖励基金资助项目(BS2010CL011);大学生创新创业训练计划项目(CXCY2016043)

摘　　要：利用喹啉-2-甲酸修饰硅钨酸，制备了一种新型的硅钨酸有机盐催化剂（QA-HSiW）。采用X-射线粉末衍射（XRD）、红外光谱（FT-IR）、热重分析（TG）以及电位滴定等方法对催化剂进行分析，并以油酸和甲醇的酯化反应为探针反应，评价催化剂在酯化反应中的催化性能。结果表明，QA-HSiW不仅保留了硅钨酸的Keggin结构，且具有较高的酸度和良好的热稳定性。QA-HSiW表现出优良的酯化催化反应活性，在较优条件下油酸酯化转化率可达99．8％，而且催化剂具有良好的稳定性，经过简单过滤可重复使用，5次以后催化剂仍具有较好的催化活性，且反应过程中催化剂的物相及Keg-gin结构保持不变。A novel organic-silicotungstate catalyst （QA-HSiW） was prepared by the modifying of H4SiW12 040 with quinaldic acid. The QA-HSiW was characterized by powder X-ray diffraction （XRD） ,infrared spectroscopy （FT-IR） ,thermogravimetric analysis （TG） and potentiometric titration.Then the catalyst was employed for esterification of oleic acid to evaluate its acid-catalytic activ- ity.The results indicated that QA-HSiW was not only maintained the typical Keggin structure of HSiW,but also presented strong acid strength and good thermal stability.QA-HSiW exhibited excellent catalytic activity in esterification and the conversion of oleic acid could reach up to 99.8% under optimal conditions.QA-HSiW had good reusability and there was no obvious change for the phase and the Keggin structure of catalyst after the reaction.

关 键 词：硅钨酸盐 固体酸催化剂 KEGGIN结构 酯化 

分 类 号：O643.3[理学—物理化学]