Benchmark single-step ethylene purification from ternary mixtures by a customized fluorinated anion-embedded MOF

Yunjia Jiang,, Yongqi Hu,, Binquan Luan,, Lingyao Wang,, Rajamani Krishna,, Haofei Ni,, Xin Hu and Yuanbin Zhang ()
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Yunjia Jiang,: College of Chemistry and Life Sciences, Zhejiang Normal University
Yongqi Hu,: College of Chemistry and Life Sciences, Zhejiang Normal University
Binquan Luan,: IBM Thomas J. Watson Research, Yorktown Heights
Lingyao Wang,: College of Chemistry and Life Sciences, Zhejiang Normal University
Rajamani Krishna,: University of Amsterdam
Haofei Ni,: College of Chemistry and Life Sciences, Zhejiang Normal University
Xin Hu: College of Chemistry and Life Sciences, Zhejiang Normal University
Yuanbin Zhang: College of Chemistry and Life Sciences, Zhejiang Normal University

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Ethylene (C2H4) purification from multi-component mixtures by physical adsorption is a great challenge in the chemical industry. Herein, we report a GeF62- anion embedded MOF (ZNU-6) with customized pore structure and pore chemistry for benchmark one-step C2H4 recovery from C2H2 and CO2. ZNU-6 exhibits significantly high C2H2 (1.53 mmol/g) and CO2 (1.46 mmol/g) capacity at 0.01 bar. Record high C2H4 productivity is achieved from C2H2/CO2/C2H4 mixtures in a single adsorption process under various conditions. The separation performance is retained over multiple cycles and under humid conditions. The potential gas binding sites are investigated by density functional theory (DFT) calculations, which suggest that C2H2 and CO2 are preferably adsorbed in the interlaced narrow channel with high aff0inity. In-situ single crystal structures with the dose of C2H2, CO2 or C2H4 further reveal the realistic host-guest interactions. Notably, rare C2H2 clusters are formed in the narrow channel while two distinct CO2 adsorption locations are observed in the narrow channel and the large cavity with a ratio of 1:2, which accurately account for the distinct adsorption heat curves.

Date: 2023
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DOI: 10.1038/s41467-023-35984-5

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