Molecular design of nanohybrid gas separation membranes for optimal CO2 separation |
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Authors: | Cher Hon Lau Donald R Paul Tai Shung Chung |
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Affiliation: | 1. Department of Chemical & Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, 117576 Singapore, Singapore;2. Department of Chemical Engineering, The University of Texas at Austin, Austin, TX 7812 0231, USA |
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Abstract: | Organic-inorganic materials comprising CO2-philic components may yield superior CO2 transport properties and good CO2/H2 gas selectivity. We report that a fine balance in size heterogeneity in the silicon-based structures is essential and a mixture of sizes up to 50 nm surrounded by 5–15 nm silicon-based nanostructures is the preferred inorganic phase morphology that yields optimal nanohybrid membranes. The combination of optimal synthesis conditions i.e. water/silicon ratio, condensation and ozone pre-treatment durations yields a nanohybrid membrane with a CO2 permeability of 2000 Barrer while achieving a CO2/H2 selectivity of 11. The findings of this work are important for the design of gas separation membranes using green materials. |
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