摘要
采用晶种诱导水热合成法,在配比n(SiO2):n(Al2O3):n(Na2O+K2O):n(NaF):n(H2O)=1.00:0.05:0.35:0—1.00:35.00的溶胶中,于管状大孔陶瓷载体上合成了高通量T型分子筛膜.氟盐的添加大大促进了T型分子筛的晶化速度.在优化条件下,在大孔氧化铝和莫来石载体上合成了c轴取向的致密T型分子筛晶体层,且表现出高的渗透汽化性能.在75℃时,在氧化铝载体上合成的分子筛膜在水/乙醇质量比为10/90体系中的平均渗透通量和分离因子分别为(3.01±0.15)kg·m^-2·h^-1和2140±100,比在莫来石载体上形成膜的平均分离因子升高31.29%,而渗透通量降低13.11%.同时研究了原料液浓度和分离温度对T型分子筛膜的渗透汽化性能的影响.
Zeolite T membranes were synthesized by seed-induced hydrothermal synthesis using a gel with a molar ratio of n( SiO2 ) : n( Al2O3 ) : n( Na2O + K2O) : n(NaF) : n(H2O) = 1.00: 0.05: 0.35: 0.50:35.00 on macroporous tubular ceramics supports. The addition of fluoride salts promoted the crystallization of supported zeolite T layers. Under optimized conditions, the c-oriented compact zeolite T layers were synthesized on macroporous mullite and α-Al2O3 tubes. The membranes synthesized on α-Al2O3 tubes had an average total flux of(3.01 ±0.14)kg ·m^-2· h^-1 and an average separation factor of 2 140 ± 100 for the 90wt% ethanol aqueous solution at 75 ℃ ,which are 31.29% higher and 13.11% lower, respectively, than those of the mullite-supported membranes. The effects of op- eration temperature and concentration of water on the pervaporation properties of the membranes were also investiga- ted.
出处
《江西师范大学学报(自然科学版)》
CAS
北大核心
2013年第6期589-593,共5页
Journal of Jiangxi Normal University(Natural Science Edition)
基金
科技部"863"计划(2012AA03A609)
国家国际合作重大专项(2010DFA34440)
国家自然科学基金(20906042
20966003)资助项目