A microporous cobalt-based metal-organic framework for selective gas adsorption

Herein, a novel metal-organic framework {[Co(DTBDA)](2)center dot DMF center dot MeOH}(n) (FJI-H37) was prepared by solvothermal reaction of cobalt nitrate with ligand 5,5 '-di(1H-1,2,4-triazol-1-yl)-(1,1 '-biphenyl)-2,2 '-dicarboxylic acid (H(2)DTBDA). FJI-H37 not only has 0.69 nm of micropores for gas adsorption but also possesses good thermal stability and organic solvent tolerance. The gas adsorption tests show that FJI-H37 can not only selectively adsorb C2H2 from a C2H2/CO2 (50:50, V/V) mixture with a relatively high adsorption selectivity of 4.2, but also selectively capture CO2 from a CO2/N-2 (15:85, V/V) and CO2/CH4 (50:50, V/V) mixture; which can be further confirmed by the dynamic fixed-bed breakthrough experiments.