| 两步变温法微米晶种诱导合成高性能的T型分子筛膜 | |
| Preparation of High Performance Zeolite T Membranes by a Two-Stage Temperature-Varied Synthesis with Microsized Seeds | |
| 摘要: 在预涂自制微米晶种的多孔管状莫来石支撑体表面上，采用两步变温法诱导合成T型分子筛膜。在溶胶配比nSiO2∶nAl2O3∶nNa2O∶nK2O∶nH2O=1∶0.05∶0.3∶0.1∶30合成条件下，通过变温晶化过程成功制备出高性能的T型分子筛膜。XRD和SEM结果表明，该法可在支撑体表面上较快地形成一层连续致密的纯相T型分子筛膜层，较大缩短了膜合成时间和提高了膜致密性。在优化条件下所合成的膜具有优异的渗透汽化性能，且膜制备的重复性良好。75 ℃时，在水/异丙醇(10/90，w/w)混合物体系中膜的渗透通量和分离因子分别高达4.25 kg·m-2·h-1，7600；在水/乙醇(10/90，w/w)混合物体系中膜的渗透通量和分离因子分别为2.87 kg·m-2·h-1，1 900。 | |
| 关键词: T型分子筛膜 两步变温合成法 二次生长法 渗透汽化 | |
| 基金项目: | |
| Abstract: Zeolite T membranes were prepared by a two-stage temperature-varied hydrothermal technique with microsized seeds on the surface of the porous mullite supports. Under the typical synthesis solution of nSiO2∶nAl2O3∶nNa2O∶nK2O∶nH2O=1∶0.05∶0.3∶0.1∶30, the zeolite T membranes with high permeation performance were successfully synthesized by the two-stage temperature-varied crystallization process. The results of XRD and SEM showed that a continuous and dense T-type zeolite layer formed on the surface of the support. The two-stage temperature-varied synthesis method leads to shorten crystallization time and improved membrane density. The as-synthesized zeolite membranes exhibited high pervaporation performance and high-reproducibility of preparation procedure. The permeation flux and separation factor of the membrane were obtained over 4.25 kg·m-2·h-1 and 7 600 for water/i-propanol (10/90, w/w) mixtures at 75 ℃, respectively. Moreover, the permeation flux of the membrane up to 2.87 kg·m-2·h-1 and separation factor over 1900 were achieved for water/ethanol (10/90, w/w) mixtures at the same operation conditions. | |
| Keywords: zeolite T membrane two-stage temperature-varied synthesis secondary growth pervaporation | |
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| 张小亮,宋 鑫,邱灵芳,周荣飞,陈祥树.两步变温法微米晶种诱导合成高性能的T型分子筛膜[J].无机化学学报,2012,28(9):1914-1918. | |
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