Complete Utilization of Ligand Coordination Sites in Co-MOF for C<sub>2</sub>H<sub>2</sub>/CO<sub>2</sub> Separation
Bin Shao, Jingjing Chen, Xiaokang Wang, Mingwei Jie, Zhe Ma, Xun Liu, Hui Chen, S. Yu, Weidong Fan
Abstract
Separating acetylene (C 2 H 2 ) and carbon dioxide (CO 2 ) is challenging due to their similar properties. Metal–organic frameworks (MOFs) are promising adsorbents for this separation, and the discovery of new structures is vital for advancing MOF applications. Herein, we report a two-dimensional Co-MOF, [Co(H 2 O) 2 (DCBA) 0.5 ] (UPC-117), with 4″,6′-diamino-5′,5″-bis(4-carboxyphenyl)-[1,1′:3′,1″:3″,1‴-quaterphenyl]-4,4‴-dicarboxylic acid (H 4 DCBA) as ligand. It is rarely observed that all four carboxyl groups and two amino groups of H 4 DCBA are involved in coordination, affording one-dimensional rhombic channels of 4.0 Å × 10.4 Å in UPC-117. The exposed open metal sites after activation endow UPC-117 with an excellent C 2 H 2 /CO 2 separation performance, which is evidenced by static adsorption isotherms, dynamic breakthrough curves, and theoretical calculations.