Insights into the thermodynamic-kinetic synergistic separation of propyne/propylene in anion pillared cage MOFs with entropy-enthalpy balanced adsorption sites.

The separation potential (Δ q = q 1 y 2 / y 1 − q 2 ) 31 as a combined metric of both selectivity and capacity was utilized here for further comparison, which showed a trend of ZNU-2-Si (36.2 mol kg −1 ) > ZNU-2-Ti (31.0 mol kg −1 ) > SIFSIX-1-Cu (29.0 mol kg −1 ) 14 > TIFSIX-14-Cu-i (27.3 mol kg −1 ) 17 > GeFSIX-14-Cu-i (26.3 mol kg −1 ) 17 > ZNU-2-Nb (25.0 mol kg −1 ) > SIFSIX-14-Cu-i (24.6 mol kg −1 ) > SIFSIX-3-Ni (24.1 mol kg −1 ) 14 > SIFSIX-2-Cu-i (23.4 mol kg −1 ) 14 > ZU-62 (22.4 mol kg −1 ) 18 > NKMOF-11 (22.0 mol kg −1 ) 20 > ELM-12 (21.2 mol kg −1 ) 19 at 1 bar and 298 K ( Fig. 2g ).

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