A highly selective polybenzimidazole‐4,4′‐(hexafluoroisopropylidene)bis(benzoic acid) membrane for high‐temperature hydrogen separation |
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| Authors: | Sun Hee Choi Da Hye Kim Do Young Kim Jun Young Han Chang Won Yoon Hyung Chul Ham Jin‐Ho Kim Hyoung‐Juhn Kim Suk Woo Nam Tae‐Hoon Lim Jonghee Han |
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| Affiliation: | 1. Fuel Cell Research Center, Korea Institute of Science and Technology, Seoul, Republic of Korea;2. Green School, Korea University, Seoul, Republic of Korea;3. Department of Clean Energy and Chemical Engineering, Korea University of Science and Technology, Republic of Korea;4. Youlchon chemical, Gyeonggi‐do, Republic of Korea |
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| Abstract: | A polymeric gas separation membrane utilizing polybenzimidazole based on 4,4′‐(hexafluoroisopropylidene)bis(benzoic acid) was prepared. The synthesized membrane has an effective permeating area of 8.3 cm2 and a thickness of 30 ± 2 µm. Gas permeation properties of the membrane were determined using H2, CO2, CO, and N2 at temperatures ranging from 24°C to 200°C. The PBI‐HFA membranes not only exhibited excellent H2 permeability, but it also displayed superior gas separation performance particularly for H2/N2 and H2/CO2. The permeation parameters for both permeability and selectivity [  and α(H2/N2);  and α(H2/CO2)] obtained for the new material were found to be dependent on trans‐membrane pressure difference as well as temperature, and were found to surpass those reported by Robeson in 2008. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42371. |
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| Keywords: | membranes properties and characterization separation techniques |
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