Porous Hydrogen-Bonded Frameworks Assembled from Metal-Nucleobase Entities for Xe/Kr Separation  

作　　者：Ying Liu Juanjuan Dai Lidong Guo Zhiguo Zhang Yiwen Yang Qiwei Yang Qilong Ren Zongbi Bao 

机构地区：[1]Key Laboratory of Biomass Chemical Engineering of Ministry of Education,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027 [2]Institute of Zhejiang University-Quzhou,Quzhou 324000

出　　处：《CCS Chemistry》2022年第1期381-388,共8页中国化学会会刊（英文）

基　　金：supported by the Zhejiang Provincial Natural Science Foundation of China(no.LR17B060001);the National Natural Science Foundation of China(nos.21722609 and 21878260).

摘　　要：It is challenging to obtain high-purity xenon(Xe)and krypton(Kr)from the by-products of the air separation process due to their similar atom size and physical properties.Adsorption using porous materials such as metal–organic frameworks(MOFs)has been considered a promising technology to separate Xe/Kr.Herein,we report two novel isostructural ionic supramolecular MOFs(SMOFs;SMOF-PFSIX-1 and SMOF-AsFSIX-1),in which inorganic anions(PF_(6)^(−)or AsF_(6)^(−))and cationic metal–organic entities have self-assembled through hydrogen bonds to give three-dimensional pore channels.The two kinds of SMOFs can efficiently separate Xe/Kr with ideal adsorbed solution theory(IAST)selectivity values of 6.9 and 6.7 under 298 K and 1.0 bar,respectively.The breakthrough experiments further confirm their industrial application potential.The grand canonical Monte Carlo(GCMC)and density functional theory(DFT)calculations revealed that there are multiple adsorptive sites to capture the Xe atom,and the affinity between Xe and frameworks can be attributed to the inorganic anions and amino groups on the ligands.To the best of our knowledge,this was the first report of using SMOFs for Xe/Kr separation,and we proposed a new strategy for Xe/Kr separation based on the synergistic effect of amino and inorganic anions.

关 键 词：supramolecular metal-organic frameworks gas separation adsorption XENON KRYPTON 

分 类 号：O64[理学—物理化学]