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Plasticization-Enhanced Hydrogen Purification Using Polymeric Membranes
- Lin, Haiqing, Van Wagner, Elizabeth, Freeman, Benny D., Toy, Lora G., Gupta, Raghubir P.
- Science 2006 v.311 no.5761 pp. 639-642
- artificial membranes, carbon dioxide, crosslinking, energy requirements, hydrogen, hydrogen sulfide, polyethylene glycol
- Polymer 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.