Experimental study of hydrogen, carbon dioxide and nitrogen permeation through a microporous silica membrane : short communication

Richard, V. and Favre, E. and Tondeur, D. and Nijmeijer, A. (2001) Experimental study of hydrogen, carbon dioxide and nitrogen permeation through a microporous silica membrane : short communication. Chemical Engineering Journal, 84 (3). pp. 593-598. ISSN 1385-8947

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Abstract:	The transport of hydrogen, carbon dioxide and nitrogen through a microporous tubular silica membrane has been investigated between 20 and 200°C and 3–9 bar upstream pressure. Pure compounds permeabilities decrease from H2 to N2 and do not show a strong dependence upon upstream pressure. Temperature variation could be described by an Arrhenius law with low apparent activation energies (3.5, 3.7 and 3.4 kJ mol−1, respectively, for hydrogen, carbon dioxide and nitrogen). The ideal separation selectivity computed from these results leads to values around 3.5 and 3 for H2/CO2 and CO2/N2 separation independent of temperature. These values are significantly smaller than those expected from a strict Knudsen mechanism (4.7 and 3.7, respectively). A viscous contribution, resulting for instance from a too large pore size distribution of the active silica layer, possibly accounts for the experimental results obtained.
Item Type:	Article
Copyright:	Elsevier Science
Research Group:	Inorganic Materials Science (IMS)
Link to this item:	http://purl.utwente.nl/publications/72301
Official URL:	http://dx.doi.org/10.1016/S1385-8947(01)00173-5
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