高岭土原位无溶剂法合成小粒径ZSM-5分子筛
Synthesis of Small Particle Size ZSM-5 Zeolite with Kaolin by in-Situ Solvent Free Method
作者单位E-mail
张培青 湖南理工学院, 岳阳 414000  
刘思成 湖南理工学院, 岳阳 414000  
郑淑琴 湖南理工学院, 岳阳 414000 zhengshuqin37@163.com 
摘要: 结合原位水热法和无溶剂法的优点,在不添加有机模板剂和溶剂的基础上,以高岭土为原料通过晶种诱导绿色高效地合成出ZSM-5分子筛。运用X射线衍射、N2吸附-脱附、扫描电镜、透射电镜和NH3程序升温脱附(TPD-NH3)等技术对ZSM-5分子筛进行表征。表征结果与原位水热法合成的ZSM-5分子筛相比,原位无溶剂法合成ZSM-5分子筛的结晶度较高、晶体粒径较小、酸强度略高、孔结构相似。
关键词: 沸石  合成设计  合成方法  机械力化学  无溶剂  无模板剂  原位晶化  高岭土
基金项目: 国家自然科学基金(No.21371055)、湖南省教育厅科学研究项目重点项目(No.18A313)基金资助。
Abstract: By effectively combining in-situ crystallization and solvent-free method, the ZSM-5 zeolite was synthesized by seed induction and optimal synthesis conditions in a green and efficient manner on the basis of kaolin as raw material without adding organic template agent and solvent. The optimal synthesis conditions for the synthesis of ZSM-5 was:nNa2O/nSiO2 was 0.18~0.22, amount of seeds added was 5%(w/w) and reaction time was 70 h. The ZSM-5 zeolite was characterized by X-ray diffraction, N2 adsorption-desorption, scanning electron microscope, transmission electron microscope and NH3 programmed temperature desorption. Compared with ZSM-5 zeolite synthesized by hydrothermal method of in-situ crystallization, ZSM-5 zeolite by in-situ solvent free method obtained higher crystallinity, smaller crystal size, slightly higher acid strength and little difference in pore structure. In addition, the in-situ solvent-free method not only solved the problems of large pressure of the synthesis system and waste liquid discharge, but also improved the utilization rate of the reactor volume.
Keywords: zeolites  synthesis design  synthesis methods  mechanochemical synthesis  solvent-free  template-free  in-situ crystallization  kaolin
投稿时间:2019-08-05 修订日期:2019-11-09
摘要点击次数:  69
全文下载次数:  67
张培青,刘思成,郑淑琴.高岭土原位无溶剂法合成小粒径ZSM-5分子筛[J].无机化学学报,2020,35(2):289-294.
查看全文  查看/发表评论  下载PDF阅读器
Support information: