离子热法合成沸石咪唑骨架材料及其溶解-结晶机理研究  

Ionothermal synthesis of zeolitic imidazolate frameworks and the synthesis dissolution-crystallization mechanism

作　　者：王亚松[1,2] 徐云鹏[1] 李大伟[1,2] 刘浩[1,2] 厉晓蕾[1,2] 陶硕[1,2] 田志坚[1,3] 

机构地区：[1]中国科学院大连化学物理研究所洁净能源国家实验室,辽宁大连116023 [2]中国科学院大学,北京100049 [3]中国科学院大连化学物理研究所催化基础国家重点实验室,辽宁大连116023

出　　处：《催化学报》2015年第6期855-865,共11页

基　　金：supported by the National Natural Science Foundation of China(21001102;21373214)~~

摘　　要：基于沸石咪唑骨架材料在离子液体和低共熔溶剂中冷却结晶的析出方式,开发了一种离子热法合成沸石咪唑骨架材料的新途径,采用X射线衍射、扫描电镜、核磁共振光谱、红外光谱以及热重分析等方法对制备的产物进行了表征,研究了合成条件对产物结晶度、尺寸和形貌的影响,探讨了沸石咪唑骨架材料在离子热合成体系中的溶解-结晶析出机理.研究发现,冷却速率能够影响产物形貌,急速冷却时,sod(RCSR代码)型产物的形貌为球形,zni(RCSR代码)型产物为棒状或平板状;程序控制冷却时,sod型产物的形貌为多面体,zni型产物呈团簇状.A cooling-induced crystallization process was used to synthesize sod （RCSR symbol）-and zni （RCSR symbol）-type zeolitic imidazolate frameworks （ZIFs） ionothermally in 1-ethyl-3-methylimidazolium bromide ionic liquid and a urea-choline chloride deep eutectic solvent. The products were charac-terized by X-ray diffraction, scanning electron microscopy, nuclear magnetic resonance spectrosco-py, infrared spectroscopy and thermal gravimetric analysis. The effect of the synthesis conditions on the crystallinity, size and morphology of the product was studied. The dissolution-crystallization mechanism of ZIFs was discussed. The cooling rate affected the product morphology. When the synthesis solution was cooled by rapid cooling, the shape of the sod-type product was spherical and the morphology of the zni-type product was rod-like or plate-like. With a programmed cooling, the sod-type product was polyhedron in shape and the zni-type product was in the form of clusters.

关 键 词：离子热合成 沸石咪唑骨架材料 溶解-结晶机理 溶解度 冷却析出 

分 类 号：O626.23[理学—有机化学]