A study of gas diffusion characteristics on a micro porous composite silica ceramic membrane.

Nwogu, Ngozi Claribelle; Kajama, Mohammed; Gobina, Edward

Abstract

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 89.2-36?m while Membrane Z ranges between 150.72 and 43.69?m. 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.

Citation

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 [online], 134, pages 1044-1050. Available from: https://doi.org/10.1016/j.compstruct.2015.07.121

• Journal Article Type: Article
• Acceptance Date: Aug 18, 2015
• Online Publication Date: Aug 18, 2015
• Publication Date: Dec 15, 2015
• Deposit Date: Feb 29, 2016
• Publicly Available Date: Aug 19, 2016
• Journal: Composite structures
• Print ISSN: 0263-8223
• Electronic ISSN: 1879-1085
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 134
• Pages: 1044-1050
• DOI: https://doi.org/10.1016/j.compstruct.2015.07.121
• Keywords: Ceramic membrane; Gas diffusion; Dip coating; Knudsen flow & viscous flow
• Public URL: http://hdl.handle.net/10059/1394