A study of gas diffusion characteristics on a micro porous composite silica ceramic membrane.
Nwogu, Ngozi Claribelle
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NWOGU, N. C., KAJAMA, M. and GOBINA, E., 2015. A study of gas diffusion characteristics on a micro porous composite silica ceramic membrane. Composite Structures, Vol. 134, pp. 1044-1050.
The purpose of this study is to investigate gas permeation behaviour of five gases (CO2, He, H2, N2 and Ar) across two silica modified ceramic membranes, Membrane Y and Membrane Z. An examination of the variations in their layer thickness and flow rate was determined. Solution-dip coating process was used for the modification process specifically for pore size reduction. This resulted in some level of modifications in the layer thickness after a successive dipping time as well as flow rate in relation to pressure drop. The effect of number of dips generally influenced the layer thickness of both membranes. Membrane Y layer thickness through five successive dipping was in the range of 89.2-36μm while Membrane Z ranges between 150.72-43.69 μm. Gas permeability as a function of mean pressure for membrane Z was calculated using data obtained experimentally. The permeation tests confirmed the contribution of both Knudsen and viscous flow mechanism with an estimation and prediction of the membrane pore radius.