High-throughput gas separation by flexible metal–organic frameworks with fast gating and thermal management capabilities

Shotaro Hiraide, Yuta Sakanaka, Hiroshi Kajiro, Shogo Kawaguchi, Minoru T. Miyahara () and Hideki Tanaka ()
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Shotaro Hiraide: Kyoto University, Nishikyo
Yuta Sakanaka: Kyoto University, Nishikyo
Hiroshi Kajiro: Nippon Steel Corporation
Shogo Kawaguchi: Japan Synchrotron Radiation Research Institute (JASRI)
Minoru T. Miyahara: Kyoto University, Nishikyo
Hideki Tanaka: Research Initiative for Supra-Materials (RISM), Shinshu University

Nature Communications, 2020, vol. 11, issue 1, 1-15

Abstract: Abstract Establishing new energy-saving systems for gas separation using porous materials is indispensable for ensuring a sustainable future. Herein, we show that ELM-11 ([Cu(BF4)2(4,4′-bipyridine)2]n), a member of flexible metal–organic frameworks (MOFs), exhibits rapid responsiveness to a gas feed and an ‘intrinsic thermal management’ capability originating from a structural deformation upon gas adsorption (gate-opening). These two characteristics are suitable for developing a pressure vacuum swing adsorption (PVSA) system with rapid operations. A combined experimental and theoretical study reveals that ELM-11 enables the high-throughput separation of CO2 from a CO2/CH4 gas mixture through adiabatic operations, which are extreme conditions in rapid pressure vacuum swing adsorption. We also propose an operational solution to the ‘slipping-off’ problem, which is that the flexible MOFs cannot adsorb target molecules when the partial pressure of the target gas decreases below the gate-opening pressure. Furthermore, the superiority of our proposed system over conventional systems is demonstrated.

Date: 2020
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DOI: 10.1038/s41467-020-17625-3

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