Inserting V‑Shaped Bidentate Partition Agent into MIL-88-Type Framework for Acetylene Separation from Acetylene-Containing Mixtures

The separation of light hydrocarbon mixtures, especially for acetylene-containing mixtures, is in urgent demand to prepare chemical feedstocks and fuels. Here, we have prepared a new 8-connected metal–organic framework (termed as FJU-99), by employ the well-defined pore space partition (PSP) strategy. Unlike the pacs (partitioned acs net) framework using C 3-symmetric partition agent, this framework uses a V-shaped bidentate partition agent (ADPT = 2-amino-4,6-dipyriadl-1,3,5-triazines). After inserting the V-shaped bidentate ligand, the large hexagonal channel has been divided into numerous finite segments. Notably, the activated FJU-99a features permanent porosity with a Brunauer–Emmett–Teller (BET) surface area of 802.5 m2 g–1, remarkably higher than the mother framework MIL-88. Ideal adsorbed solution theory (IAST) reveals that FJU-99a shows excellent selectivity toward C2H2/CH4 and C2H2/CO2 at 296 K. Laboratorial breakthrough experiments also attested that the PSP framework is promising for the separation of C2H2/CH4 and C2H2/CO2.