Ultramicroporous membranes for hydrogen separation

M. C. Duke, J. C. Diniz da Costa, G. Q. Lu, M. Petch and P. Gray (2002). Ultramicroporous membranes for hydrogen separation. In: EERE 2002, Environmental Engineering Research Event, Blackheath, NSW, Australia, (1-7). 3-6 December, 2002.

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Author M. C. Duke
J. C. Diniz da Costa
G. Q. Lu
M. Petch
P. Gray
Title of paper Ultramicroporous membranes for hydrogen separation
Conference name EERE 2002, Environmental Engineering Research Event
Conference location Blackheath, NSW, Australia
Conference dates 3-6 December, 2002
Publication Year 2002
Sub-type Fully published paper
Volume On proceedings cd:
Start page 1
End page 7
Abstract/Summary Fuel cell systems offer excellent efficiencies when compared to internal combustion engines, which result in reduced fuel consumption and greenhouse gas emissions. One of the areas requiring research for the success of fuel cell technology is the H2 fuel purification to reduce CO, which is a poison to fuel cells. Molecular sieve silica (MSS) membranes have a potential application in this area. In this work showed activated transport, a characteristic of ultramicroporous (dp<5Å) materials in which the permeation increased with temperature. H2 permeance resulted in 1.2 x 10-8 mol.m-2.s-1.Pa-1 and a H2/CO permselectivity of 33 (200oC, 2 bar _P). Observations made during surface preparation showed that the permeance was not hindered by the intermediate layers, and that only the top (selective) layer played a significant role in reducing gas permeance. The pressure difference across the membrane showed that the permeance was pressure independent, except at pressures below 2 bar, which resulted in a higher permeance. High quality membranes purified a mixed gas containing 42% H2 by over two fold with the remainder being made up of N2, CO2 and CO. These are encouraging results for applying MSS membranes to environmentally promising fuel cell systems.
Subjects 290603 Membrane and Separation Technologies
References Diniz da Costa, J. C., G. Q. Lu, V. Rudolph and Y. S. Lin, (2002) Novel molecular sieve silica (MSS) membranes: characterisation and permeation of single-step and two-step sol-gel membranes. Journal of Membrane Science vols.198, no.1, pp. 9-21. de Vos, R. M. and H. Verweij, (1998) Improved performance of silica membranes for gas separation. Journal of Membrane Science vol.143, nos.1-2, pp. 37-51. ECW, (2000) Fuel Cells for the Distributed Generation: A Technology and Marketing Survey, Energy Centre of Wisconsin, Report 193-1, March 2000 Hasegawa, Y., A. Ueda, K. Kusakabe and S. Morooka, (2002) Oxidation of CO in hydrogen-rich gas using a novel membrane combined with a microporous SiO2 layer and a metal-loaded [gamma]-Al2O3 layer. Applied Catalysis A: General vol.225, nos.1-2, pp. 109-115. Koros, W. J. and R. Mahajan, (2000) Pushing the limits on possibilities for large scale gas separation: which strategies? Journal of Membrane Science vol.175, no.2, pp. 181-196. Ledjeff-Hey, K., V. Formanski, T. Kalk and J. Roes, (1998) Compact hydrogen production systems for solid polymer fuel cells. Journal of Power Sources vol.71, no.1-2, pp. 199-207. Lin, Y.-M. and M.-H. Rei, (2000) Process development for generating high purity hydrogen by using supported palladium membrane reactor as steam reformer. International Journal of Hydrogen Energy vol.25, no.3, pp. 211-219. D. Rastler, D. Herman, R. Goldstein and J. O'Sullivan, (1996) State of the art fuel cell technologies for distributed Power, Electric Power Research Institute, Palo Alto, California, USA Tosti, S., L. Bettinali and V. Violante, (2000). Rolled thin Pd and Pd-Ag membranes for hydrogen separation and production. International Journal of Hydrogen Energy vol.25, no.4, pp. 319-325.
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