Fluorinated 2D covalent organic frameworks with hcb topology for selective C2H4/C3H6 separation
Jialiang Liu1, Xinyu Luo1, Sen Wang1
1College of Materials Science and Engineering, Science and Education Integration College of Energy and Carbon Neutralization, Zhejiang University of Technology, Hangzhou 310014, China. panjun0123@zjut.edu.cn.
None:
Efficient separation of C2H4/C3H6 is essential for downstream polymer production, yet remains industrially challenging. Porous materials offer an energy-efficient alternative to cryogenic distillation, with fluorinated frameworks showing promise due to their tunable polarity and strong host-guest interactions. Herein, two isoreticular 2D covalent organic frameworks (COFs), TpDf-COF and TpTf-COF, with hcb topology were synthesized via [3+3] imine condensation. TpTf-COF, bearing a higher fluorine content, exhibits an IAST selectivity of 9.14 for C2H4/C3H6 at 298 K and 1 bar, outperforming TpDf-COF (6.57). GCMC simulations reveal that enhanced selectivity originates from increased pore polarity and strengthened C-H⋯F interactions with C3H6, highlighting the role of fluorination in modulating COF-based gas separation performance.
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