Effect of mesoporous silica modification on the structure of hybrid carbon membrane for hydrogen separation |
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Authors: | Hui-Hsin Tseng Pei-Ting Shiu Yi-Shan Lin |
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Affiliation: | a School of Occupational Safety and Health, Chung Shan Medical University, Taichung 402, Taiwan, ROC b Department of Occupational Medicine, Chung Shan Medical University Hospital, Taichung 402, Taiwan, ROC |
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Abstract: | An SBA-15/carbon molecular sieve (CMS) composite membrane, using polyetherimide as a precursor and mesoporous silica as filler, was fabricated for hydrogen separation. The effect of mesoporous SBA-15 on the gas transport properties of the composite membrane was evaluated. The permeability and selectivity coefficients of H2, CO2, O2, N2, and CH4 were estimated for the pure CMS and SBA-15/CMS composite membranes at a feed pressure of 2-7 atm for 30 °C. The SBA-15/CMS composite membrane had a gas permeability higher than that of the pure CMS membrane, whereas its selectivity was the same. The permeability was found to be independent of pressure; this indicates that the gases are transported through the membrane by a molecular sieve mechanism. The membranes appeared to have a more microporous structure when the mesoporous silica SBA-15 was incorporated. These results concur with the hypothesis that SBA-15 improves gas diffusivity by increasing pore volume. |
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Keywords: | Carbon membrane Hydrogen separation Mesoporous silica SBA-15 Modification |
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