摘要
采用化学气相沉积(CVD)法对MFI分子筛膜进行Sn掺杂,制备了一种Sn-MFI分子筛膜,并研究了其渗透汽化分离乙醇/水体系的性能.XRD,29Si NMR,UV-Vis及分离实验结果表明,采用CVD法在将Sn引入MFI膜时,膜层结构基本得到保持,Sn可以进入分子筛骨架,有效地减少了膜表面的硅羟基缺陷,提高了膜分离乙醇/水体系时的稳定性.在SnCl4用量为3 mL、修饰时间为1 h时,所得到的Sn-MFI分子筛膜的渗透汽化分离性能最佳,并可在60℃下分离5%(质量分数)乙醇/水混合物时保持良好的稳定性.在经过连续50 h渗透气化分离后,其渗透通量仅从1.52 kg·m−2·h−1下降至1.38 kg·m−2·h−1,分离因子从18下降至16.
Sn-modified MFI zeolite membranes were prepared by chemical vapor deposition(CVD)method using anhydrous SnCl4 as Sn source,and were applied for the separation of alcohol-water mixture by pervapora⁃tion.SEM,XRD,29Si NMR and UV-Vis analyses showed that Sn can be introduced into the framework of MFI zeolite membranes by CVD process with their structure remained.The surface Si—OH groups can be effective⁃ly reduced after the incorporation of Sn,and the obtained membranes showed improved stability.The zeolite membrane prepared with 3 mL of SnCl4 at autoclave bottom and the reaction time of 1 h had the best separation performance and also showed a long-term stability for the separation of 5%ethanol/water mixture at 60℃.After 50 h,the permeation flux slightly decreased from 1.52 kg·m−2·h−1 to 1.38 kg·m−2·h−1,and the separation factor decreased from 18 to 16.
作者
彭莉
吴政奇
王兴
王博轩
顾学红
PENG Li;WU Zhengqi;WANG Xing;WANG Boxuan;GU Xuehong(State Key Laboratory of Materials-Oriented Chemical Engineering,Nanjing Tech University,Nanjing 211816,China)
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2020年第12期2710-2716,共7页
Chemical Journal of Chinese Universities
基金
国家重点研发计划项目(批准号:2018YFB1501701)
国家自然科学基金(批准号:22035002,21776128)
材料化学工程国家重点实验室项目(批准号:ZK201719)资助.
关键词
MFI分子筛膜
锡修饰
化学气相沉积法
MFI molecular sieve membrane
Sn modification
Chemical vapor deposition(CVD)method
