Volume 60, Issue 52 pp. 27184-27188
Communication

A Molecular Compound for Highly Selective Purification of Ethylene

Anurag Noonikara-Poyil

Anurag Noonikara-Poyil

Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX, 76019 USA

These authors contributed equally to this work.

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Hui Cui

Hui Cui

Department of Chemistry, University of Texas at San Antonio, San Antonio, TX, 78249 USA

These authors contributed equally to this work.

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Dr. Andrey A. Yakovenko

Dr. Andrey A. Yakovenko

X-Ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439 USA

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Prof. Dr. Peter W. Stephens

Prof. Dr. Peter W. Stephens

Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY, 11794-3800 USA

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Prof. Dr. Rui-Biao Lin

Prof. Dr. Rui-Biao Lin

MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275 China

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Bin Wang

Bin Wang

Department of Chemistry, University of Texas at San Antonio, San Antonio, TX, 78249 USA

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Prof. Dr. Banglin Chen

Corresponding Author

Prof. Dr. Banglin Chen

Department of Chemistry, University of Texas at San Antonio, San Antonio, TX, 78249 USA

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Prof. Dr. H. V. Rasika Dias

Corresponding Author

Prof. Dr. H. V. Rasika Dias

Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX, 76019 USA

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First published: 20 October 2021
Citations: 23

Graphical Abstract

Structurally flexible, copper scorpionate binds ethylene extremely selectively from an ethylene–ethane mixture and displays excellent performance as a reusable material for the important and challenging C2H4/C4H6 separation.

Abstract

Purification of C2H4 from an C2H4 /C2H6 mixture is one of the most challenging separation processes, which is achieved mainly through energy-intensive, cryogenic distillation in industry. Sustainable, non-distillation methods are highly desired as alternatives. We discovered that the fluorinated bis(pyrazolyl)borate ligand supported copper(I) complex {[(CF3)2Bp]Cu}3 has features very desirable in an olefin–paraffin separation material. It binds ethylene exclusively over ethane generating [(CF3)2Bp]Cu(C2H4). This molecular compound exhibits extremely high and record ideal adsorbed solution theory (IAST) C2H4 /C2H6 gas separation selectivity, affording high purity (>99.5 %) ethylene that can be readily desorbed from separation columns. In-situ PXRD provides a “live” picture of the reversible conversion between [(CF3)2Bp]Cu(C2H4) and the ethylene-free sorbent in the solid-state, driven by the presence or removal of C2H4. Molecular structures of trinuclear {[(CF3)2Bp]Cu}3 and mononuclear [(CF3)2Bp]Cu(C2H4) are also presented.

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