硅钨酸@酵母杂化微球催化合成2-氨乙基-17-烯基咪唑啉  

Catalytic synthesis of 2-ammonia ethyl-17-heptadecenylim imidazoline by silicotungstic acid@yeast hybrid microspheres

作　　者：陈晓东[1,2] 白波[3] 杨明科[3] 侯雯雯[1,2] 黄瑾[1,2] 陈君[1,2] 

机构地区：[1]陕西省石油化工研究设计院,陕西西安710054 [2]陕西省石油精细化学品重点实验室,陕西西安710054 [3]长安大学环境科学与工程学院,陕西西安710054

出　　处：《化学工程》2015年第9期45-51,共7页Chemical Engineering(China)

基　　金：2014陕西省石油精细化学品重点实验室开放基金(Syzdsys2014-01)

摘　　要：以酵母为载体,用浸渍法制备了硅钨酸(HSiW)@酵母复合催化剂,用FE-SEM,FT-IR,XRD,TG-DTA,BET对其进行表征,并用该催化剂催化合成2-氨乙基-17-烯基咪唑啉来考察其催化性能,探讨了不同因素对咪唑啉生成的影响和该反应的动力学级数,同时还考察了催化剂的重复使用性能。由表征结果可知:HSiW@酵母复合催化剂保持了酵母原本的椭球状,大小均匀[粒径长为(4.2±0.5)μm,宽为(3.1±0.5)μm],复合结构的形成与酵母细胞的表面化学官能团有关,其晶体结构主要为Keggin型结构,具有很好的热稳定性;比表面积为4.52 m2/g。催化反应结果表明,碱性条件有利于咪唑啉的合成;在150℃以下,温度越高越有利于反应的进行,反应属于一级反应。催化剂可以被重复利用4次。Silicotungstic acid （HSiW）-impregnated yeast hybrid micro-spheres were prepared by impregnation- adsorption technique and respectively characterized by FE-SEM, FT-IR, XRD, TG-DTA and BET. Their catalytic behaviours were investigated via synthesis of 2-ammonia ethyl-17-heptadecenylim imidazoline. The reaction conditions for imidazoline synthesis were optimized, the kinetics of the reaction order was discussed, and the stability of HSiW@ yeast in the catalytic reaction was investigated. The results show that from characterizations by FE-SEM, the HSiW is effectively introduced onto the surface of yeast, and the resulting samples retain ellipsoid shape, with the uniform size [ length （4.2 ±0.5）μm, width （ 3. 1 ±0.5）μm ] ; the functional groups or chemical bonds inherited from the pristine yeast cell are critical to the assembling of the composites by FT-IR; the main crystal structure of as-synthesized HSiW@ yeast microsphere is Keggin structure by XRD ; TG-DTA states that the HPW in composites has better thermal stability. Meanwhile, the samples obtained have the smaller BET surface （4.52 m^2/g）. The catalytic reaction shows that the alkaline condition and higher temperature are favourable for the synthesis of imidazoline below 150 ℃, and the reaction belongs to a first order reaction at the different temperature. The HSiW@ yeast catalyst can be reused 4 times.

关 键 词：HSiW@酵母 催化 咪唑啉 动力学 重复利用 

分 类 号：TQ25[化学工程—有机化工]