A metal-organic framework with double interpenetrated frameworks for effective C2H2/CO2 separation

A new metal-organic framework FJU-59a with double interpenetrated structure exhibits good separation selectivity (4.3) for C2H2/CO2 mixtures at 296 K and 1 bar. [Display omitted] •A new MOF FJU-59 with double interpenetrated frameworks was obtained.•The FJU-59a exhibits stronger affinity for C2H2, compared with CO2.•The FJU-59a has a good separation selectivity of 4.3 for C2H2/CO2 mixtures at 296 K and 1 bar. A new metal–organic framework [Zn2(BDC)2(H2NDI)](H2O)2(MeOH)2(DMF) FJU-59 with double interpenetrated frameworks is constructed by bi-pyrazolate 2,7-bis(3,5-dimethyl)dipyrazol-1,4,5,8-naphthalene-tetracarboxydiimide (H2NDI), terephthalic acid (H2BDC) and Zn(NO3)2·6H2O under solvothermal conditions. The gas adsorption isotherms and the adsorption enthalpy indicate that there is stronger affinity between activated FJU-59a and C2H2, comparing to between FJU-59a and CO2. The ideal adsorption solution theory (IAST) calculation reveals that FJU-59a has good separation selectivity (4.3) for C2H2/CO2 mixtures at 296 K and 1 bar.