Hydrogen‐Bonded Polyimide/Metal‐Organic Framework Hybrid Membranes for Ultrafast Separations of Multiple Gas Pairs

Journal Article · 04 June 2019 · Advanced Functional Materials

DOI: https://doi.org/10.1002/adfm.201903243 · OSTI ID:1524257

Ma, Canghai ^[1]; Urban, Jeffrey J.  ^[1]

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1. The Molecular Foundry Lawrence Berkeley National Laboratory 1 Cyclotron Rd Berkeley CA 94720 USA

Abstract Membranes have seen a growing role in mitigating the extensive energy used for gas separations. Further expanding their effectiveness in reducing the energy penalty requires a fast separation process via a facile technique readily integrated with industrial membrane formation platforms, which has remained a challenge. Here, an ultrapermeable polyimide/metal‐organic framework (MOF) hybrid membrane is reported, enabling ultrafast gas separations for multiple applications (e.g., CO ₂ capture and hydrogen regeneration) while offering synthetic enhanced compatibility with the current membrane manufacturing processes. The membranes demonstrate a CO ₂ and H ₂ permeability of 2494 and 2932 Barrers, respectively, with a CO ₂ /CH ₄ , H ₂ /CH ₄ , and H ₂ /N ₂ selectivity of 29.3, 34.4, and 23.8, respectively, considerably surpassing the current Robeson permeability–selectivity upper bounds. At a MOF loading of 55 wt%, the membranes display a record‐high 16‐fold enhancement of H ₂ permeability comparing with the neat polymer. With mild membrane processing conditions (e.g., a heating temperature less than 80 °C) and a performance continuously exceeding Robeson upper bounds for over 5300 h, the membranes exhibit enhanced compatibility with state‐of‐the‐art membrane manufacturing processes. This performance results from intimate interactions between the polymer and MOFs via extensive, direct hydrogen bonding. This design approach offers a new route to ultraproductive membrane materials for energy‐efficient gas separations.

• Sponsoring Organization: USDOE
• Grant/Contract Number: DE‐AC02‐05CH11231; DE‐IA0000018
• OSTI ID: 1524257
• Journal Information: Advanced Functional Materials, Journal Name: Advanced Functional Materials Vol. 29 Journal Issue: 32; ISSN 1616-301X
• Publisher: Wiley Blackwell (John Wiley & Sons)Copyright Statement
• Country of Publication: Germany
• Language: English