High-Flux MFI Zeolite Membrane Supported on YSZ Hollow Fiber for Separation of Ethanol/Water
High-Flux MFI Zeolite Membrane Supported on YSZ Hollow Fiber for Separation of Ethanol/Water
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DOI：
10.1021/ie301087u
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发表时间：
2012-09
影响因子：
4.2
通讯作者：
Xiaojun Shu;Xuerui Wang;Qingqing Kong;X. Gu;N. Xu
中科院分区：
文献类型：
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作者：
Xiaojun Shu;Xuerui Wang;Qingqing Kong;X. Gu;N. Xu
纯硅MFI沸石（silicalite - 1）膜在乙醇/水混合物的分离中显示出巨大潜力。然而，对于silicalite膜的合成，传统的载体如α - Al₂O₃和莫来石会有铝元素溶出并进入沸石结构，这会降低沸石层的疏水性，从而影响对乙醇选择性的分离性能。在本文中，我们在由无铝的氧化钇稳定的氧化锆（YSZ）制成的中空纤维基底上制备了silicalite膜。研究了晶种尺寸、合成参数和基底的影响。通过扫描电子显微镜（SEM）、电子探针微分析仪（EPMA）、红外光谱分析（IR）和X射线衍射（XRD）对合成的膜进行了表征。在基底上可形成厚度约为3μm的薄MFI沸石层，该层对乙醇相对于水表现出高选择性。在分离……时具有7.4 kg m⁻² h⁻¹的高通量。
Pure-silica MFI zeolite (silicalite-1) membranes exhibit great potential in the separation of an ethanol/water mixtures. For synthesis of silicalite membranes, however, conventional supports such as α-Al2O3 and mullite have aluminum element leaching out and entering into a zeolite structure, which would reduce the hydrophobicity of the zeolite layer and thus affect the separation performance for ethanol selectivity. In this paper, we prepared silicalite membranes on hollow fiber substrates fabricated with yttria stabilized zirconia (YSZ) without aluminum. The influence of seed size, synthesis parameters, and substrates was investigated. The as-synthesized membranes were characterized by scanning electron microscopy (SEM), electron probe microanalyzer (EPMA), infrared spectrum analysis (IR), and X-ray diffraction (XRD). A thin MFI zeolite layer with a thickness of about 3 μm could be formed on the support, which exhibited highly selective to ethanol over water. A high flux of 7.4 kg m–2 h–1 with the separa...