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Title: Silica nanohybrid membranes with high CO 2 affinity for green hydrogen purification
Authors: Lau, C.H. 
Liu, S. 
Paul, D.R.
Xia, J.
Jean, Y.-C.
Chen, H.
Shao, L.
Chung, T.-S. 
Issue Date: Jul-2011
Citation: Lau, C.H., Liu, S., Paul, D.R., Xia, J., Jean, Y.-C., Chen, H., Shao, L., Chung, T.-S. (2011-07). Silica nanohybrid membranes with high CO 2 affinity for green hydrogen purification. Advanced Energy Materials 1 (4) : 634-642. ScholarBank@NUS Repository.
Abstract: 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-theart PEO-based membranes. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Source Title: Advanced Energy Materials
ISSN: 16146832
DOI: 10.1002/aenm.201100195
Appears in Collections:Staff Publications

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