https://scholars.lib.ntu.edu.tw/handle/123456789/630176
Title: | Inverse CO2/C2H2 Separation with MFU-4 and Selectivity Reversal via Postsynthetic Ligand Exchange | Authors: | Liu, Qiao Cho, Sung Gu Hilliard, Jordon Wang, Ting Yuan Chien, Szu Chia LI-CHIANG LIN Co, Anne C. Wade, Casey R. |
Keywords: | Acetylene | CO 2 | Inverse Separation | Metal–Organic Frameworks | Molecular Sieving | Issue Date: | 1-Jan-2023 | Publisher: | WILEY-V C H VERLAG GMBH | Source: | Angewandte Chemie - International Edition | Abstract: | Although many porous materials, including metal–organic frameworks (MOFs), have been reported to selectively adsorb C2H2 in C2H2/CO2 separation processes, CO2-selective sorbents are much less common. Here, we report the remarkable performance of MFU-4 (Zn5Cl4(bbta)3, bbta=benzo-1,2,4,5-bistriazolate) toward inverse CO2/C2H2 separation. The MOF facilitates kinetic separation of CO2 from C2H2, enabling the generation of high purity C2H2 (>98 %) with good productivity in dynamic breakthrough experiments. Adsorption kinetics measurements and computational studies show C2H2 is excluded from MFU-4 by narrow pore windows formed by Zn−Cl groups. Postsynthetic F−/Cl− ligand exchange was used to synthesize an analogue (MFU-4-F) with expanded pore apertures, resulting in equilibrium C2H2/CO2 separation with reversed selectivity compared to MFU-4. MFU-4-F also exhibits a remarkably high C2H2 adsorption capacity (6.7 mmol g−1), allowing fuel grade C2H2 (98 % purity) to be harvested from C2H2/CO2 mixtures by room temperature desorption. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/630176 | ISSN: | 14337851 | DOI: | 10.1002/anie.202218854 |
Appears in Collections: | 化學工程學系 |
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