A charge-assisted hydrogen-bonded organic framework with polar porosities for selective separation of o-xylene from CHaromatic isomers
作者机构：Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province School of Chemistry and Chemical EngineeringGuizhou University Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials Department of Chemistry and Chemical Engineering School of Chemistry and Biological Engineering University of Science and Technology Beijing Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological EngineeringZhejiang University Center for Neutron Research National Institute of Standards and Technology
出 版 物：《Science China Chemistry》 (中国科学:化学(英文版))
年 卷 期：2024年
核心收录：
学科分类：081702[工学-化学工艺] 081704[工学-应用化学] 08[工学] 0817[工学-化学工程与技术] 081701[工学-化学工程]
基 金：supported by the National Natural Science Foundation of China (22235001, 22175020, 22131005, 22261132512, 22225802) the Xiaomi Young Scholar Program the Fundamental Research Funds for the Central Universities (FRF-EYIT-23-02) ,the University of Science and Technology Beijing the Fundamental Research Funds for the Central Universities (QNXM2023) the Guizhou University
摘 要：Porous materials have been extensively explored to facilitate the development of energy-efficient separation processes towards handling industrial ***,a microporous charge-assisted hydrogen-bonded organic framework,HOF-35,was assembled from 2,3,5,6-tetrakis（4-carboxyphenyl）pyrazine with dimethylamine formed from the decomposition of N,N-dimethylformamide under solvothermal *** crystal X-ray diffraction （SCXRD） analysis reveals that HOF-35 was assembled from divalent H2L2-anions and dimethylammonium cations via hydrogen bonding *** single-crystal to single-crystal transformations were achieved through two-step solvent exchanges followed by a desolvent process,resulting in the activated sample HOF-35a with a Brunauer-Emmett-Teller surface area of 464 m2g-1according to CO2sorption experiment at 196 *** particular,HOF-35a can selectively adsorb o-xylene over m-xylene,p-xylene,and ethylbenzene on the basis of multicomponent liquid-phase adsorption *** studies disclose the exact binding sites and multiple host-guest interactions of the four C8 molecules accommodated in this ***-differential scanning calorimetry analyses further estimate the highest adsorption enthalpy for o-xylene among these four C8 molecules,accounting for its preferential adsorption in the activated HOF from a thermodynamic ***-dependent liquid-phase adsorption experiments unveil the kinetic diffusion of C8 ***,the thermodynamic effect in combination with the kinetic diffusion process synergistically promotes the above-mentioned selective separation.
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