A Microporous Potassium‐Organic Framework for Efficient C ₂ H ₂ /CO ₂ Separation

Abstract

Abstract A novel potassium‐based metal organic framework ( TCBPA‐K ) was prepared by using a C 3 ‐symmetric organic building block tris(4′‐carboxybiphenyl)amine (TCBPA). The compound has a rectangular like channel along the b axis and exhibits good selective adsorption performance. The single component gas adsorption isotherms indicated that the adsorption capacity of C 2 H 2 is much higher than that of CO 2 at 298 K and 1 bar. The isosteric adsorption enthalpies of TCBPA‐K for C 2 H 2 and CO 2 are 30.6 kJ/mol and 9.1 kJ/mol respectively. Ideal adsorbed solution theory calculation recorded the separation selectivity of C 2 H 2 /CO 2 (50/50, v/v) as 3.5.