Metal–Organic Frameworks for Highly Selective Separation of Xylene Isomers and Single-Crystal X-ray Study of Aromatic Guest–Host Inclusion Compounds
AuthorsSapianik, Aleksandr A.
Dudko, Evgeny R.
Kovalenko, Konstantin A.
Barsukova, Marina O.
Samsonenko, Denis G.
Dybtsev, Danil N.
Fedin, Vladimir P.
KAUST DepartmentFunctional Materials Design, Discovery and Development Research Group (FMD3), Advanced Membranes and Porous Materials Center (AMPM), Division of Physical Sciences and Engineering (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
Embargo End Date2022-03-17
Permanent link to this recordhttp://hdl.handle.net/10754/668166
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AbstractSeparation of hydrocarbon molecules, such as benzene/cyclohexane and <i>o</i>-xylene/<i>m</i>-xylene/<i>p</i>-xylene, is relevant due to their widespread application as chemical feedstock but challenging because of their similar boiling points and close molecular sizes. Physisorption separation could offer an energy-efficient solution to this problem, but the design and synthesis of sorbents that exhibit high selectivity for one of the hydrocarbons remain a largely unmet challenge. Herein, we report a new heterometallic MOF with a unique tortuous shape of channels decorated with aromatic sorption sites [Li<sub>2</sub>Zn<sub>2</sub>(bpy)(ndc)<sub>3</sub>] (<b>NIIC-30(Ph)</b>, bpy = 4,4'-bipyridine, ndc<sup>2-</sup> = naphthalene-1,4-dicarboxylate) and study of its benzene/cyclohexane and xylene vapor and liquid separation. For an equimolar benzene/cyclohexane mixture, it is possible to achieve a 10-fold excess of benzene in the adsorbed phase. In the case of xylenes, microporous framework <b>NIIC-30(Ph)</b> demonstrates outstanding selective sorption properties and becomes a new benchmark for <i>m</i>-/<i>o</i>-xylene separation. In addition, <b>NIIC-30(Ph)</b> is stable enough to carry out at least three separation cycles of benzene/cyclohexane mixtures or ternary <i>o</i>-xylene/<i>m</i>-xylene/<i>p</i>-xylene mixtures both in the liquid and in the vapor phase. Insights into the performance of <b>NIIC-30(Ph)</b> are gained from X-ray structural studies of each aromatic guest inclusion compound.
CitationSapianik, A. A., Dudko, E. R., Kovalenko, K. A., Barsukova, M. O., Samsonenko, D. G., Dybtsev, D. N., & Fedin, V. P. (2021). Metal–Organic Frameworks for Highly Selective Separation of Xylene Isomers and Single-Crystal X-ray Study of Aromatic Guest–Host Inclusion Compounds. ACS Applied Materials & Interfaces. doi:10.1021/acsami.1c02812
SponsorsSynthesis of new heterometallic MOF and its luminescence investigation were supported by the Russian Science Foundation grant (No.1973-00171), and X-ray structural analysis and sorption/selectivity investigation were supported by the Russian Science Foundation grant (No. 19-73-20087). The authors thank Dr. P. V. Dorovatovskii and Dr. V. A. Lazarenko for their assistance during synchrotron XRD experiments.
PublisherAmerican Chemical Society (ACS)
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