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Inverse CO 2 /C 2 H 2 Separation with MFU-4 and Selectivity Reversal via Postsynthetic Ligand Exchange.
- Source :
-
Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2023 Apr 24; Vol. 62 (18), pp. e202218854. Date of Electronic Publication: 2023 Mar 24. - Publication Year :
- 2023
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Abstract
- Although many porous materials, including metal-organic frameworks (MOFs), have been reported to selectively adsorb C <subscript>2</subscript> H <subscript>2</subscript> in C <subscript>2</subscript> H <subscript>2</subscript> /CO <subscript>2</subscript> separation processes, CO <subscript>2</subscript> -selective sorbents are much less common. Here, we report the remarkable performance of MFU-4 (Zn <subscript>5</subscript> Cl <subscript>4</subscript> (bbta) <subscript>3</subscript> , bbta=benzo-1,2,4,5-bistriazolate) toward inverse CO <subscript>2</subscript> /C <subscript>2</subscript> H <subscript>2</subscript> separation. The MOF facilitates kinetic separation of CO <subscript>2</subscript> from C <subscript>2</subscript> H <subscript>2</subscript> , enabling the generation of high purity C <subscript>2</subscript> H <subscript>2</subscript> (>98 %) with good productivity in dynamic breakthrough experiments. Adsorption kinetics measurements and computational studies show C <subscript>2</subscript> H <subscript>2</subscript> is excluded from MFU-4 by narrow pore windows formed by Zn-Cl groups. Postsynthetic F <superscript>-</superscript> /Cl <superscript>-</superscript> ligand exchange was used to synthesize an analogue (MFU-4-F) with expanded pore apertures, resulting in equilibrium C <subscript>2</subscript> H <subscript>2</subscript> /CO <subscript>2</subscript> separation with reversed selectivity compared to MFU-4. MFU-4-F also exhibits a remarkably high C <subscript>2</subscript> H <subscript>2</subscript> adsorption capacity (6.7 mmol g <superscript>-1</superscript> ), allowing fuel grade C <subscript>2</subscript> H <subscript>2</subscript> (98 % purity) to be harvested from C <subscript>2</subscript> H <subscript>2</subscript> /CO <subscript>2</subscript> mixtures by room temperature desorption.<br /> (© 2023 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH.)
Details
- Language :
- English
- ISSN :
- 1521-3773
- Volume :
- 62
- Issue :
- 18
- Database :
- MEDLINE
- Journal :
- Angewandte Chemie (International ed. in English)
- Publication Type :
- Academic Journal
- Accession number :
- 36877590
- Full Text :
- https://doi.org/10.1002/anie.202218854