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Science 3 February 2006:
Vol. 311. no. 5761, p. 573
DOI: 10.1126/science.311.5761.573e
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When hydrogen is produced industrially, the gas stream is typically contaminated with H2S, CO2, steam, and other impurities that need to be removed. Ideally, the separation should occur at high pressure to avoid costly recompression, but current membrane materials do not work well at high pressure. Lin et al. (p. 639) have developed polymeric membrane materials that preferentially absorbed CO2 and other impurities and that showed greater efficiency as the pressure of the gas feed was increased. Unlike conventional membranes, the presence of impurities plasticizes the polymer membranes and improves their selectivity and permeability.




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