Porous MOFs with geometric mismatch between trimers and octatopic pyrene-based ligands for low-temperature methane
Kun Wang1,2, Honghao Cao1,2, Yuanlong Zhong1,2
1Stoddart Institute of Molecular Science, Department of Chemistry, Zhejiang Key Laboratory of Excited-State Energy Conversion and Energy Storage, State Key Laboratory of Silicon and Advanced Semiconductor Materials, Zhejiang University, Hangzhou 310058, P. R. China. zhijiechen@zju.edu.cn.
Abstract:
Natural gas is recognized as a transitional clean energy fuel to address a variety of environmental problems. Identifying porous adsorbents with high-capacity low-temperature methane adsorption performances is crucial for advancing next-generation technologies for efficiently utilizing boil-off gas, inevitablely generated from liquefied natural gas systems. Herein, we synthesized highly porous metal-organic frameworks (MOFs)-TBPP-MOFs with a geometric mismatch strategy by combining seemingly incompatible trinuclear clusters with octatopic pyrene-based ligands. The Cr-TBPP-MOF achieves a high apparent Brunauer-Emmett-Teller (BET) surface area of 3700 m2 g-1 and demonstrates pore volumes of 1.31 cm3 g-1 at P/P0 = 0.9. Consequently, under the LNG-ANG coupling operation conditions, Cr-TBPP-MOF exhibits a high low-temperature methane uptake of 335 cm3 (STP) cm-3 at 159 K and 10 bar with a working capacity of 302 cm3 (STP) cm-3 between 6 bar and 159 K to 5 bar and 298 K, positioning it as a promising candidate material for low-temperature methane adsorption.
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