A Stable Interpenetrated Zn-MOF with Efficient Light Hydrocarbon Adsorption/Separation Performance
Xia Wang, Xiaokang Wang, Xiurong Zhang, Weidong Fan, Qing Li, Weifeng Jiang, Fangna Dai, Daofeng Sun
Abstract
The design of MOFs with functionalized groups as well as suitable pore space plays a momentous part in gas adsorption and separation. Herein, a new Zn-MOF (Zn4(BTB-NH2)3·xsolvent, UPC-98, H3BTB-NH2 = 2′-amino-5′-(4-carboxyphenyl)-[1,1′:3′,1″-terphenyl]-4,4″-dicarboxylic acid) was synthesized successfully by an amino-functionalized ligand (H3BTB-NH2) for light hydrocarbon adsorption and separation application. UPC-98 with twofold interpenetrating structure retains relatively high thermal stability and acid–base stability, which can be stable in aqueous solutions (pH = 4–9) and air environment at 250 °C. Interestingly, UPC-98 with micropore of 4–5 Å displays a high uptake of C3H8 (118.4 cm3·g–1) and C3H6 (120.5 cm3·g–1) at 273 K and exhibits excellent adsorption selectivity of C3/C1 and C2/C1. The effective separation performance for C2H2/C2H4 is confirmed via breakthrough experiments.