Hydrogen separation using silica-based composite membranes.
Nwogu, Ngozi Claribelle
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KAJAMA, M.N., NWOGU, N.C. and GOBINA, E. 2014. Hydrogen separation using silica-based composite membranes. Advanced materials research, 1051: Bhatnagar, A.K. (ed.) Selected papers from the 2014 international conference on green materials and environmental engineering (GMEE 2014), 21-22 September 2014, Hong Kong. Pfaffikon, Switzerland: Trans Tech Publications [online], pages 107-111. Available from: http://dx.doi.org/10.4028/www.scientific.net/AMR.1051.107
Silica sol-gel membranes have been developed for moderate temperature (300 °C) separation of hydrogen (H2) from nitrogen (N2), methane (CH4) and argon (Ar) gas molecules. Tubular ceramic support with 15 nm nominal pore diameter and 45% porosity was modified by dip-coating method. Gas permeation characteristics were evaluated. Defect free silica layer over the substrate for hydrogen gas separation was obtained. Hydrogen gas permeate flux of 4.82x10-1 mol/sec m2 at 1.0 barg feed pressure was obtained. Selectivities of H2 over N2, CH4 and Ar of 3.07, 2.23 and 3.75 at 300 °C, 200 °C and 300 °C and 0.9 barg were obtained with the silica membranes. The gas permeation and the selectivity performance of the membrane were evaluated.