(660d) Ultrathin Gas-Sieving Carbon Molecular Sieve Membranes with Modulated Pore-Size Distribution By Room-Temperature Functionalization
AIChE Annual Meeting
Friday, November 20, 2020 - 8:45am to 9:00am
Herein, 100 â 200 nm CMS films were fabricated in facile transfer and masking techniques,4 which prevented the infiltration of the CMS precursor in the pores of the membrane support. The 100-nm-thick CMS film yielded attractive gas-sieving performances with H2 permeance reaching up to 3060 gas permeation units (GPU) with corresponding H2/CH4 selectivity of 18 at 150 oC. Furthermore, a rapid and highly-tunable post-synthetic modification method based on room temperature ozone treatment was developed. The room-temperature oxygen functionalization could shrink the CMS micropores by a fraction of an angstrom, improving H2/CH4 and H2/CO2 selectivities by several-fold. The optimized membranes yielded H2 permeance of 507 GPU and H2/CH4 selectivity of 50.7. Other membrane yielded H2 permeance of 453 GPU and H2/CH4 selectivity of 106.
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