Inserting V-Shaped Bidentate Partition Agent into MIL-88-Type Framework for Acetylene Separation from Acetylene-Containing Mixtures
Ting Chen, Yingxiang Ye, Ming Yin, Liangji Chen, Zhijun Ke, Junzhi Guo, Mengxin Zhang, Zizhu Yao, Zhangjing Zhang, Shengchang Xiang
Abstract
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 C3-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.