1. Integration of Open Metal Sites and Lewis Basic Sites for Construction of a Cu MOF with a Rare Chiral Oh‐type cage for high performance in methane purification.
- Author
-
Meng, Lingkun, Niu, Ziyuan, Liang, Chen, Dong, Xinglong, Liu, Kang, Li, Guanghua, Li, Chunguang, Han, Yu, Shi, Zhan, and Feng, Shouhua
- Subjects
MOLECULAR structure of metal-organic frameworks ,COPPER compounds synthesis ,LEWIS basicity ,CHIRAL drugs synthesis ,HYDROTHERMAL synthesis ,METHANE - Abstract
Abstract: A Cu metal‐organic framework (MOF), [Cu
4 (PMTD)2 (H2 O)3 ]⋅20 H2 O, 1, (where PMTD is 1,4‐phenylenebis(5‐methyl‐4H‐1,2,4‐triazole‐3,4‐diyl)bis(5‐carboxylato‐3,1‐phenylene)bis(hydroperoxymethanide)), with a rare chiral Oh ‐type cage, and dual functionalities of open metal sites and Lewis basic sites, based on a designed U‐shaped ligand, was synthesized by hydrothermal methods. It exhibits high CO2 , C2 , and C3 hydrocarbon storage capacity under atmospheric pressure, as well as high H2 (1.96 wt.%) adsorption capacity at 77 K. Methane purification capacity was tested and verified step by step. Isosteric heats (Qst ) studies reveal that CH4 has the weakest van der Waals host–guest interactions among the seven gases at 298 K. Ideal adsorbed solution theory (IAST) calculation reveals that compound 1 is more selective toward CO2 , C2 H6 , and C3 H8 over CH4 in further calculating its separation capacity, as exemplified for CO2 /CH4 (50:50, 5:95), C2 H6 /CH4 (50:50, 5:95), or C3 H8 /CH4 (50:50, 5:95) binary gas mixtures. Breakthrough experiments show that 1 has a significantly higher adsorption capacity for CO2 , C2 H6 , and C3 H8 than CH4 . The selective adsorption properties of 1 make it a promising candidate for methane purification. [ABSTRACT FROM AUTHOR]- Published
- 2018
- Full Text
- View/download PDF