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Structure Regulation of MOF Nanosheet Membrane for Accurate H2/CO2 Separation |
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| Authors: | Hongling Song Dr Yuan Peng Chenlu Wang Dr Lun Shu Chenyu Zhu Dr Yanlei Wang Prof Hongyan He Prof Weishen Yang |
| Institution: | 1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023 China
University of Chinese Academy of Sciences, 19 A Yuquan Road, Beijing, 100049 China;2. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023 China;3. University of Chinese Academy of Sciences, 19 A Yuquan Road, Beijing, 100049 China Beijing Key Laboratory of Ionic Liquids Clean Process, State Key Laboratory of Multiphase Complex Systems, CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190 China;4. University of Chinese Academy of Sciences, 19 A Yuquan Road, Beijing, 100049 China |
| Abstract: | High-purity H2 production accompanied with a precise decarbonization opens an avenue to approach a carbon-neutral society. Metal–organic framework nanosheet membranes provide great opportunities for an accurate and fast H2/CO2 separation, CO2 leakage through the membrane interlayer galleries decided the ultimate separation accuracy. Here we introduce low dose amino side groups into the Zn2(benzimidazolate)4 conformation. Physisorbed CO2 served as interlayer linkers, gently regulated and stabilized the interlayer spacing. These evoked a synergistic effect of CO2 adsorption-assisted molecular sieving and steric hinderance, whilst exquisitely preserving apertures for high-speed H2 transport. The optimized amino membranes set a new record for ultrathin nanosheet membranes in H2/CO2 separation (mixture separation factor: 1158, H2 permeance: 1417 gas permeation unit). This strategy provides an effective way to customize ultrathin nanosheet membranes with desirable molecular sieving ability. |
| Keywords: | Metal–Organic Framework Membrane Nanosheet Amino Functionalization Gas Separation |