The synthesis and characterization of porous alumina supports and supported membranes were studied in this work. The influences of PVA amount on the microstructure of supports and on the permeation of gases were investigated. Experimental results showed the amount of PVA is important for controlling the porosity of support without varying other microstructural properties to any significant extent. The permeation of gases through porous supports can be described by Knudsen diffusion and Poiseuille flow. The transport mechanism for the gases through a supported membrane is the combination of Knudsen diffusion, Poiseuille flow, and surface diffusion. However, Knudsen diffusion plays the most important role on the permeabilities of gases. The separation factors of He-N2, He-CO2, and N2-CO2 mixtures can be estimated from permeabilities of pure gases and are mainly limited by the ratios of their molecular weights.
|Number of pages||12|
|Journal||Key Engineering Materials|
|Publication status||Published - 1996 Jan 1|
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering