Silica Nanohybrid Membranes with High CO 2 Affinity for Green Hydrogen Purification

An effective separation of CO 2 from H 2 can be achieved using currently known polyethylene oxide (PEO)‐based membranes at low temperatures but the CO 2 permeability is inadequate for commerical operations. For commercial‐scale CO 2 /H 2 separation, CO 2 permeability of these membranes must be signi...

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Veröffentlicht in:Advanced energy materials 2011-07, Vol.1 (4), p.634-642
Hauptverfasser: Lau, Cher Hon, Liu, Songlin, Paul, Donald R., Xia, Jianzhong, Jean, Yan‐Ching, Chen, Hongmin, Shao, Lu, Chung, Tai‐Shung
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Sprache:eng
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Zusammenfassung:An effective separation of CO 2 from H 2 can be achieved using currently known polyethylene oxide (PEO)‐based membranes at low temperatures but the CO 2 permeability is inadequate for commerical operations. For commercial‐scale CO 2 /H 2 separation, CO 2 permeability of these membranes must be significantly enhanced without compromising CO 2 /H 2 selectivity. We report here exceptional CO 2 /H 2 separation properties of a nanohybrid membrane comprising polyethylene glycol methacrylate (PEGMA) grafts on an organic‐inorganic membrane (OIM) consisting of a low molecular weight polypropylene oxide (PPO)‐PEO‐PPO diamine and 3‐glycidyloxypropyltrimethoxysilane (GOTMS), an alkoxysilane. The CO 2 gas permeability of this nanohybrid membrane can reach 1990 Barrer with a CO 2 /H 2 selectivity of 11 at 35 °C for a mixed gas mixture comprising 50% CO 2 ‐ 50% H 2 at 3.5 atm. The transformation of the inorganic silica phase from a well‐dispersed network of finely defined nanoparticles to rough porous clusters appears to be responsible for this OIM membrane exceeding the performance of other state‐of‐the‐art PEO‐based membranes.
ISSN:1614-6832
1614-6840
DOI:10.1002/aenm.201100195