Scalable Polymeric Few-Nanometer Organosilica Membranes with Hydrothermal Stability for Selective Hydrogen Separation
- 13 July 2021
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Nano
- Vol. 15 (7), 12119-12128
- https://doi.org/10.1021/acsnano.1c03492
Abstract
Nanoporous silica membranes exhibit excellent H2/CO2 separation properties for sustainable H2 production and CO2 capture but are prepared via complicated thermal processes above 400 °C, which prevent their scalable production at a low cost. Here, we demonstrate the rapid fabrication (within 2 min) of ultrathin silica-like membranes (∼3 nm) via an oxygen plasma treatment of polydimethylsiloxane-based thin-film composite membranes at 20 °C. The resulting organosilica membranes unexpectedly exhibit H2 permeance of 280–930 GPU (1 GPU = 3.347 × 10–10 mol m–2 s–1 Pa–1) and H2/CO2 selectivity of 93–32 at 200 °C, far surpassing state-of-the-art membranes and Robeson’s upper bound for H2/CO2 separation. When challenged with a 3 d simulated syngas test containing water vapor at 200 °C and a 340 d stability test, the membrane shows durable separation performance and excellent hydrothermal stability. The robust H2/CO2 separation properties coupled with excellent scalability demonstrate the great potential of these organosilica membranes for economic H2 production with minimal carbon emissions.Keywords
Funding Information
- American Chemical Society Petroleum Research Fund
- U.S. Department of Energy (DE-FE0026463)
- Division of Chemical, Bioengineering, Environmental, and Transport Systems (1554236)
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