Abstract
Adsorptive separation of p-xylene (pX) from xylene isomers is a key process in chemical industry, but known adsorbents cannot simultaneously achieve high adsorption selectivity, capacity, and rate. Here, we demonstrate gating ultramicropore as a solution for this challenge. Slight modification of the synthetic condition gives rise to isomeric metal-organic frameworks α-[Zn(pba)] (MAF-88, H2pba = 4-(1H-pyrazol-4-yl)benzoic acid) and β-[Zn(pba)] (MAF-89) possessing similar pillared-column structures, porosities, and high pX capacities of 2.0 mmol g−1, but very different framework/pore topologies, pore sizes, and pX selectivities. For binary and ternary mixtures of liquid xylene isomers, MAF-88 with narrow one-dimensional (1D) channels shows pX selectivity of 11 and 1.6, while MAF-89 with 3D-connected quasi-discrete pores shows pX selectivity up to 221 and 46, respectively. Thermogravimetry, differential scanning calorimetry, and time-dependent separation experiments reveal that the kinetic effects of the gating pores play more important roles than the thermodynamic effects, which is further confirmed by single-crystal X-ray diffraction and computational simulations.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (21731007, 22090061, 21821003, 22161021). C.-T. He acknowledges the support of Jiangxi Province (jxsq2018106041) and the “Young Elite Scientists Sponsorship Program” by CAST. We thank the staffs of BL17B/BL18U/BL19U1/BL19U2/BL01B beamlines at National Center for Protein Sciences Shanghai and Shanghai Synchrotron Radiation Facility, for assistance in collecting the single-crystal diffraction data of MAF-89, and thank Prof. Ming-Liang Tong and Mr. Kai-Ping Xie from Sun Yat-Sen University for assistance in collecting the single-crystal diffraction data of MAF-88.
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A gating ultramicroporous metal-organic framework showing high adsorption selectivity, capacity and rate for xylene separation
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Ye, ZM., Zhang, XF., Liu, DX. et al. A gating ultramicroporous metal-organic framework showing high adsorption selectivity, capacity and rate for xylene separation. Sci. China Chem. 65, 1552–1558 (2022). https://doi.org/10.1007/s11426-022-1304-1
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DOI: https://doi.org/10.1007/s11426-022-1304-1