A Metal Chelating Porous Polymeric Support: The Missing Link for a Defect-Free Metal-Organic Framework Composite Membrane
A Metal Chelating Porous Polymeric Support: The Missing Link for a Defect-Free Metal-Organic Framework Composite Membrane
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DOI：
10.1002/anie.201611927
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发表时间：
2017-03-06
影响因子：
16.6
通讯作者：
Peinemann, Klaus-Viktor
中科院分区：
文献类型：
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作者：
Barankova, Eva;Tan, Xiaoyu;Peinemann, Klaus-Viktor
自从发现尺寸选择性金属有机框架（MOFs）以来，研究人员一直试图将这些材料纳入气体分离膜中。发现了令人印象深刻的气体选择性，但这些MOF膜大多在无机载体上制成，其对于工业气体分离来说通常过于庞大和昂贵。在多孔聚合物载体上形成MOF层在工业上是有吸引力的，但在技术上是有挑战性的。描述了克服这些问题的两个特征：1）结合MOF层的金属螯合载体聚合物，和2）通过反向扩散控制MOF晶体生长，目的是非常薄的纳米晶MOF层。使用金属螯合聚氨基硫脲（PTSC）支持和调整金属和有机配体的浓度仔细，一个非常紧凑的ZIF-8（ZIF=沸石咪唑骨架）层，显示干涉色，因为它的光滑表面和极薄的可见光范围内。在氢气/丙烷（8350）和丙烯/丙烷（150）选择性方面测量了高性能。
Since the discovery of size-selective metal-organic frameworks (MOFs), researchers have tried to incorporate these materials into gas separation membranes. Impressive gas selectivities were found, but these MOF membranes were mostly made on inorganic supports, which are generally too bulky and expensive for industrial gas separation. Forming MOF layers on porous polymer supports is industrially attractive but technically challenging. Two features to overcome these problems are described: 1) a metal chelating support polymer to bind the MOF layer, and 2) control of MOF crystal growth by contra-diffusion, aiming at a very thin nanocrystalline MOF layer. Using a metal chelating polythiosemicarbazide (PTSC) support and adjusting the metal and organic ligand concentrations carefully, a very compact ZIF-8 (ZIF=zeolitic imidazolate framework) layer was produced that displayed interference colors because of its smooth surface and extreme thinness-within the range of visible light. High performances were measured in terms of hydrogen/propane (8350) and propylene/propane (150) selectivity.