Synthesis of a partially fluorinated ZIF-8 analog for ethane/ethene separation

Mondal SS, Hovestadt M, Dey S, Paula C, Glomb S, Kelling A, Schilde U, Janiak C, Hartmann M, Holdt HJ (2017)

Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2017



Book Volume: 19

Pages Range: 5882-5891

Journal Issue: 39

DOI: 10.1039/c7ce01438d


The separation of ethane/ethene mixtures (as well as other paraffin/olefin mixtures) is one of the most important but challenging processes in the petrochemical industry. In this work, we report the synthesis of ZIF-318, isostructural to ZIF-8 but built from the mixed linkers of 2-methylimidazole (L1) and 2-trifluoromethylimidazole (L2) (ZIF-318 = [(Zn(L1)(L2)](n)). The synthesis has been optimized to proceed without ZnO-formation. Using only the L2 linker under solvothermal conditions afforded ZnO-embedded in the H-bonded and non-porous coordination polymer ZnO@[Zn-2(L2)(2)(HCOO)(OH)](n). The slight differences in the size of the substituents (-CH3 vs. -CF3) possibly in combination with different electronic inductive effects led to small but significant changes to the pore size and properties respectively, though the effective pore opening (aperture) size of ZIF-318 remained the same in comparison with ZIF-8. ZIF-318 is chemically (boiling water, methanol, benzene, and wide pH range at room temperature for 1 day), thermally (up to 310 degrees C) stable, and more hydrophobic than ZIF-8 which is proven by contact angle measurement. ZIF-318 can be activated for N-2, CO2, CH4, H-2, ethane, ethane, propane, and propene gases sorptions. Consequently, in breakthrough experiments, the ethane/ethene mixtures can be separated.

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Mondal, S.S., Hovestadt, M., Dey, S., Paula, C., Glomb, S., Kelling, A.,... Holdt, H.-J. (2017). Synthesis of a partially fluorinated ZIF-8 analog for ethane/ethene separation. CrystEngComm, 19(39), 5882-5891.


Mondal, Suvendu Sekhar, et al. "Synthesis of a partially fluorinated ZIF-8 analog for ethane/ethene separation." CrystEngComm 19.39 (2017): 5882-5891.

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