Wang Yuhan, Jin Hua, Ma Qiang, Mo Kai, Mao Haizhuo, Feldhoff Armin, Cao Xingzhong, Li Yanshuo, Pan Fusheng, Jiang Zhongyi
School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China.
School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, 315211, China.
Angew Chem Int Ed Engl. 2020 Mar 9;59(11):4365-4369. doi: 10.1002/anie.201915807. Epub 2020 Jan 29.
Metal-organic framework (MOF) glasses are promising candidates for membrane fabrication due to their significant porosity, the ease of processing, and most notably, the potential to eliminate the grain boundary that is unavoidable for polycrystalline MOF membranes. Herein, we developed a ZIF-62 MOF glass membrane and exploited its intrinsic gas-separation properties. The MOF glass membrane was fabricated by melt-quenching treatment of an in situ solvothermally synthesized polycrystalline ZIF-62 MOF membrane on a porous ceramic alumina support. The molten ZIF-62 phase penetrated into the nanopores of the support and eliminated the formation of intercrystalline defects in the resultant glass membrane. The molecular sieving ability of the MOF membrane is remarkably enhanced via vitrification. The separation factors of the MOF glass membrane for H /CH , CO /N and CO /CH mixtures are 50.7, 34.5, and 36.6, respectively, far exceeding the Robeson upper bounds.
金属有机框架（MOF）玻璃因其显著的孔隙率、易于加工，以及最显著的是，有可能消除多晶MOF膜中不可避免的晶界，而成为膜制造的有前途的候选材料。在此，我们开发了一种ZIF-62 MOF玻璃膜，并利用其固有的气体分离特性。通过对多孔陶瓷氧化铝载体上原位溶剂热合成的多晶ZIF-62 MOF膜进行熔融淬火处理，制备了MOF玻璃膜。熔融的ZIF-62相渗透到载体的纳米孔中，消除了所得玻璃膜中晶间缺陷的形成。通过玻璃化显著提高了MOF膜的分子筛能力。MOF玻璃膜对H₂/CH₄、CO₂/N₂和CO₂/CH₄混合物的分离因子分别为50.7、34.5和36.6，远远超过了罗伯逊上限。
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