Abstract
A novel microporous membrane has been prepared by modifying an asymmetric SiC support using polydimethylsilane (PMS). One membrane, pyrolyzed at 573 K, possesses H2/N2 selectivity of ∼100 and H2 permeance of 8.9 × 10−8 mol·m−2·s−1·Pa−1 at 473 K. The other membrane, pyrolyzed at 873 K, has a lower H2/N2 selectivity of ∼40 and lower H2 permeance of 4.9 × 10−9 mol·m−2·s−1·Pa−1 at 473 K. Permeation in both membranes exhibits the characteristics of activated diffusion at elevated temperatures. A higher pyrolysis temperature results in a less‐permeable membrane. The support preparation and the thermal events of PMS are analyzed. The effects of pyrolysis temperature on membrane property are discussed.
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