| 含硼MFI型分子筛膜制备与渗透汽化性能研究 | |
| Studies on Synthesis and Pervaporation Performance of Boron-Substituted MFI Zeolite Membranes | |
| 摘要: 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、11B MAS NMR和SEM对形成膜和粉末进行表征，并考察了溶胶nB/nSiO2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nB/nSiO2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。 | |
| 关键词: 含硼MFI型分子筛 二次生长法 渗透汽化 | |
| 基金项目: | |
| Abstract: 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 ( 11B MAS NMR) and scanning electron microscope (SEM). The effects of nB/nSiO2 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. nB/nSiO2 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% (w/w) acetone/water and 5% (w/w) ethanol/water binary feeds at 60 ℃, which were higher than those through a silicalite-1 membrane prepared under the same synthesis condition. | |
| Keywords: boron-substituted zeolite MFI secondary growth pervaporation | |
| 摘要点击次数: 1959 | |
| 全文下载次数: 1883 | |
| 周荣飞,孔佑鑫,朱美华,张 飞,张小亮,陈祥树.含硼MFI型分子筛膜制备与渗透汽化性能研究[J].无机化学学报,2012,28(5):942-948. | |
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