采用二次生长法在廉价的多孔莫来石管状支撑体上合成了含硼MFI(B-MFI)分子筛膜.通过XRD、FTIR、ICP-AES、11BMAS NMR和SEM对形成膜和粉末进行表征,并考察了溶胶nBSiO2比、料液温度和浓度对分子筛膜渗透汽化性能的影响.表征结果证实BO4存在于MFI晶体骨架中.溶胶nBSiO2,比对膜层微结构和渗透汽化性能有较大影响.B-MFI型分子筛膜选择性地从水溶液中透过有机物,在60℃、质量分数5％丙酮/水和乙醇/水体系的分离因子分别为260和70,均高于同等条件下制备的silicalite-1分子筛膜.%Boron-substituted MFI (B-MFI) zeolite membranes were synthesized on low-cost porous mullite tubes by secondary growth. The as-synthesized membranes and powders were characterized by X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), Inductive coupled Plasma Emission Spectrometer (ICP-AES), (FTIR) 11B magic angle spinning nuclear magnetic resonance ("B MAS NMR) and scanning electron microscope (SEM). The effects of n8sio2, ratio in gel, feed temperature and concentration on pervaporation (PV) for acetone/water mixtures through B-MFI zeolite membranes were also investigated. The results of characterization verified BO4 substituted SiO4 in MFI framework. n8/rasio2. ratio in gel took great effects on the microstructure and PV performance of B-MFI zeolite membrane. B-MFI zeolite membranes could permeate selectively organics from water with acetone and ethanol separation factors of 260 and 70 for 5% (wlw) acetone/water and 5% (wlw) ethanol/water binary feeds at 60 ℃, which were higher than those through a silicalite-1 membrane prepared under the same synthesis condition.
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