1. Incorporation of bifunctional aminopyridine into an NbO-type MOF for the markedly enhanced adsorption of CO2 and C2H2 over CH4
- Author
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Zhenzhen Jiang, Minghui He, Fengjie Xia, Tingting Xu, Ying Zou, Xiaojuan Wang, Xia Wang, Yabing He, and Luyao Yang
- Subjects
Ligand ,Inorganic chemistry ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Copper ,0104 chemical sciences ,Inorganic Chemistry ,chemistry.chemical_compound ,Adsorption ,chemistry ,Functional group ,Amine gas treating ,0210 nano-technology ,Bifunctional ,Porosity ,Natural bond orbital - Abstract
The development of porous MOFs exhibiting highly selective C2H2/CH4 and CO2/CH4 separations is quite important to meet the requirement of high-purity C2H2 and CH4 in various industries. By employing a ligand heterobifunctionalization strategy, we designed and synthesized an aminopyridine-functionalized diisophthalate ligand, and successfully targeted its corresponding copper-based NbO-type MOF ZJNU-98. Gas adsorption studies revealed that ZJNU-98 exhibited significantly enhanced adsorption of C2H2 and CO2 over CH4 compared to its parent MOF, NOTT-101. At 298 K and 1 atm, C2H2 and CO2 uptakes of ZJNU-98 are 10.0% and 16.7% higher than the corresponding values of NOTT-101, while 14.2% and 18.8% increases in C2H2/CH4 and CO2/CH4 adsorption selectivities were observed for the equimolar gas mixtures in ZJNU-98 compared to NOTT-101. Furthermore, the contribution of the functional group effect on gas adsorption has been assessed, demonstrating that the amine group plays a more important role than the pyridinic-N atom despite its lower Lewis basicity. This work provided an effective way and significant experimental evidence for the design of new porous MOFs with highly enhanced gas adsorption performance.
- Published
- 2019