含氟体系中高性能T型分子筛膜的合成  

Synthesis of High-Performance Zeolite T Membrane in Fluoride Media

作　　者：张飞[1] 郑艺鸿[1] 桂田[1] 王华梅[1] 胡娜[1] 周荣飞[1] 陈祥树[1] 

机构地区：[1]江西师范大学化学化工学院,南昌330022

出　　处：《无机化学学报》2014年第8期1845-1854,共10页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21366013;20906042);国家"863"重大专项课题(No.2012AA03A609)资助项目

摘　　要：含氟体系中,在负载晶种的大孔莫来石支撑体表面快速合成了高性能且取向生长的T型分子筛膜。采用XRD、SEM和MAS NMR等手段对分子筛膜层和粉末进行表征。讨论了添加物、氟硅比、合成温度和合成时间等条件对膜生长与分离性能的影响,并阐述了含氟体系中T型分子筛膜快速晶化的机理。碱金属氟盐的加入促进了T型分子筛晶体层的晶化速率,并对晶体层形貌产生了一定的影响。膜应用于75℃、水/异丙醇(10∶90,w/w)体系的平均渗透通量和分离因子分别为(4.91±0.18)kg·m-2·h-1和7 060±1 130。Oriented zeolite T membranes with high pervaporation performance were synthesized on seeded porous mullite supports in fluoride media. Zeolite powders and membranes were characterized by means of XRD, SEM and MAS NMR. The influences of synthesis conditions such as additive, nNaF/nKF ratio, synthesis temperature and time on membrane growth and separation properties were investigated. Fast crystallization mechanism of zeolite T layers in fluoride media was also suggested. The addition of alkali metal fluorides promoted the crystallization of supported zeolite T layers and affected the morphology of crystals. Fluoride-derived zeolite T membranes under optimized synthesis conditions had an average flux of （4.91±0.18） kg· m^-2·h^-1 and an average separation factor of 7 060±1 130 for a 10：90 （w/w） of water/i-propanol mixture at 348 K.

关 键 词：T型分子筛膜 莫来石支撑体 氟盐 渗透汽化 

分 类 号：O613.72[理学—无机化学] TQ028.8[理学—化学]