微型多孔材料
选择性
金属有机骨架
乙炔
化学
化学工程
材料科学
有机化学
吸附
催化作用
工程类
作者
Yongpeng Li,Ying Wang,Yingying Xue,Haipeng Li,Quan‐Guo Zhai,Shu-Ni Li,Yucheng Jiang,Xianhui Bu
标识
DOI:10.1002/anie.201908378
摘要
A strategy called ultramicroporous building unit (UBU) is introduced. It allows the creation of hierarchical bi-porous features that work in tandem to enhance gas uptake capacity and separation. Smaller pores from UBUs promote selectivity, while larger inter-UBU packing pores increase uptake capacity. The effectiveness of this UBU strategy is shown with a cobalt MOF (denoted SNNU-45) in which octahedral cages with 4.5 Å pore size serve as UBUs. The C2 H2 uptake capacity at 1 atm reaches 193.0 cm3 g-1 (8.6 mmol g-1 ) at 273 K and 134.0 cm3 g-1 (6.0 mmol g-1 ) at 298 K. Such high uptake capacity is accompanied by a high C2 H2 /CO2 selectivity of up to 8.5 at 298 K. Dynamic breakthrough studies at room temperature and 1 atm show a C2 H2 /CO2 breakthrough time up to 79 min g-1 , among top-performing MOFs. Grand canonical Monte Carlo simulations agree that ultrahigh C2 H2 /CO2 selectivity is mainly from UBU ultramicropores, while packing pores promote C2 H2 uptake capacity.
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