Structural characteristic and permeation of gases through a supported silica inorganic ceramic membrane.
Nwogu, Ngozi Claribelle
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NWOGU, N.C., KAJAMA, M.N., OSUEKE, G. and GOBINA, E. 2015. Structural characteristic and permeation of gases through a supported silica inorganic ceramic membrane. Lecture notes in engineering and computer science: the Proceedings of the world congress on engineering 2015 (WCE 2015), 1-3 July 2015, London, UK. Hong Kong: Newswood Limited [online], pages 245-248. Available from: http://www.iaeng.org/publication/WCE2015/WCE2015_pp245-248.pdf
The present paper describes the synthesis and hydrodynamic properties of a surface-modified ceramic membrane composed of a porous support which consists of gamma alumina and a titania wash-coat. Single gas permeation through the membranes was measured at 298 and 373K using H2, N2, Ar and CH4. The membranes showed high separation factors of gases consistent with Knudsen diffusion mechanisms. Structural characteristic and pore size distribution of the porous and surface modified silica membrane was analysed with Liquid Nitrogen adsorption at 77K to obtain gas adsorption/desorption isotherm of membrane materials. Both surface area of the porous support and surface-modified silica membrane was determined using Brunauer-Emmett-Teller(BET) model to reproducible isotherms while the pore diameter of both membranes was determined using Barrette- Joyner-Halenda (BJH) curve. The adsorption/desorption curve for the surface-modified silica ceramic membrane showed a type IV/V isotherm which indicates a mesoporous makeup. This surface-modified membrane, therefore, displayed high thermal stability and high permeance. Further results obtained from the experiments conducted have helped explain the effect of dissimilarity in the mass-transfer on the gas permeation through the hybrid ceramic membranes.