T型分子筛膜在清液体系中的制备优化  

Optimization of Preparing Zeolite T Membranes from Clear Solutions

作　　者：张青鹏[1] 周志辉[1] 吴红丹[1] 尧鹏魁 徐嘉晨[1] 

机构地区：[1]武汉科技大学冶金矿产资源高效利用与造块湖北省重点实验室,武汉430081

出　　处：《硅酸盐学报》2017年第7期968-975,共8页Journal of The Chinese Ceramic Society

摘　　要：采用二次生长法,通过在α-Al_2O_3载体管表面热浸渍涂晶,在摩尔比为n(SiO_2):n(Al_2O_3):n(Na_2O):n(K_2O):n(H_2O)=54.0:1.0:15.5:5.3:863.2的清液体系中制备了T型分子筛膜。通过X射线衍射和扫描电子显微镜对合成膜的结构和形貌进行了表征,研究了大小晶种匹配方式﹑晶种浓度、晶化时间和晶化温度对T型分子筛膜性能的影响。结果表明:第1次预涂浓度为10 g/L大晶种,第2次预涂浓度为5 g/L小晶种,合成温度为155℃,合成时间为6 h时,在清液体系中可成功制备T型沸石膜;将合成得到的T型分子筛膜用于70℃渗透汽化分离90%异丙醇-水体系,其渗透通量和分离因数分别可达到1.40 kg/(m^2·h)和2 318。T-type zeolite membranes were synthesized on α-Al2O3 tubular support via secondary growth from clear solution with a molar ratio of n（SiO2）：n（Al2O3）：n（Na2O）：n（K2O）：n（H2O）=54：1：15.5：5.3：863.2. The crystal structure and morphologies of T-type zeolite membranes were analyzed by X-ray diffraction and scanning electron microscopy. The effects of seed matching method, seed concentration, crystallization time and temperature on the pervaporation properties of T-type zeolite membranes were investigated. The results show that T-type zeolite membrane synthesized under the optimized conditions （i.e., the precoated seeds method of the first time of 10 g/L large seed and second time of 5 g/L small seeds, crystallization temperature of 155 ℃ and crystallization time of 6 h） has a water flux of 1.40 kg/（m^2·h） and a separation factor of 2 318 for dehydration of 90%IPA aqueous solution by pervaporation at 70 ℃.

关 键 词：T型分子筛膜 清液体系 二次生长法 热浸渍涂晶 渗透汽化 

分 类 号：TQ028.8[化学工程]