摘要
采用二次水热合成法在管状莫来石支撑体上制备TS-1分子筛膜,通过XRD、FT-IR、UV-Vis和SEM表征技术考察二次水热合成法中浸涂支撑体时晶种悬浮液浓度、合成液中的nH_2O_2/nSiO_2比率、合成液中晶种添加量等对TS-1分子筛膜的生长和催化性能的影响.当合成液的摩尔组分比、晶种液浓度、合成液中的nH_2O_2/nSiO_2比率、溶液中晶种添加质量分数、合成温度和合成时间分别为SiO_2∶0.03TiO_2∶0.2TPAOH∶120H_2O、5%、6、1%、150℃和24h时,连续致密的TS-1分子筛膜在H_2O_2氧化异丙醇反应中表现出良好的催化性能.其次,在渗透汽化-催化氧化耦合反应过程中,当异丙醇与H_2O_2摩尔比和反应温度分别为1∶2和70℃时,异丙醇的转化率达到81.14%,TS-1分子筛膜的通量为2.23kg/(m^2·h).
The TS-1 zeolite membrane was synthesized on a tubular mullite support by secondary hydrothermal synthesis.Influences of the concentration of crystal seed suspension,H2O2/SiO2 ratio and crystal seed content in the precursor synthesis solution on growth and catalytic performance of TS-1 zeolite membrane were investigated by XRD and SEM characterization.When the molar ratio of the initial synthesis solution,concentration of crystal seed suspension,H2O2/SiO2 molar ratio and crystal seed content in the precursor synthesis solution,synthesis temperature and synthesis time were SiO2 ∶0.03TiO2 ∶ 0.2TPAOH ∶ 120H2O,5%,6,1%,150 ℃ and 24 h,respectively,the as-synthesized TS-1 zeolite membrane showed an excellent catalytic performance in the oxidation of iso-propanol and hydrogen peroxide by pervaporation.Besides,when isopropanol/H2O2 molar ratio and reaction temperature in the pervaporation-catalytic oxidation process were 1 ∶ 2 and 70 ℃,the iso-propanol conversion and flux of the TS-1 zeolite membrane were 81.14% and 2.23 kg/(m2 h),respectively.
作者
朱美华
李羚
丁文娟
陈乐
李玉琴
桂田
陈祥树
ZHUMeihua , LI Ling, DING Wen juan, CHEN Le , LI Yuqin , GUI Tian , Chen Xiangshu(Institute of Advanced Materials, College of Chemistry and Chemical Engineering, State Province Joint Engineering Laboratory of Zeolite Membrane Materials, Jiangxi Normal University, Nanchang 330022, China)
出处
《膜科学与技术》
CAS
CSCD
北大核心
2018年第2期45-51,59,共8页
Membrane Science and Technology
基金
国家自然科学基金面上项目(21476099)
国家国际科技合作专项(2015DFA50190)
江西省科技厅科技项目((20171BCB24005)