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ReportsPlasticization-Enhanced Hydrogen Purification Using Polymeric MembranesPolymer membranes are attractive for molecular-scale separations such as hydrogen purification because of inherently low energy requirements. However, membrane materials with outstanding hydrogen separation performance in feed streams containing high-pressure carbon dioxide and impurities such as hydrogen sulfide and water are not available. We report highly permeable, reverse-selective membrane materials for hydrogen purification, as exemplified by molecularly engineered, highly branched, cross-linked poly(ethylene oxide). In contrast to the performance of conventional materials, we demonstrate that plasticization can be harnessed to improve separation performance.
1 Center for Energy and Environmental Resources and Department of Chemical Engineering, University of Texas, Austin, TX 78758, USA. * To whom correspondence should be addressed. E-mail: freeman{at}che.utexas.edu
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
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