The transport mechanism exhibited by most of carbon membranes is the molecular sieving mechanism. The carbon membranes contain constrictions in the carbon matrix, which approach the molecular dimensions of the absorbing species. In this manner, they are able to separate the gas molecules of similar sizes effectively. Another transport mechanism of carbon membrane is selective adsorption-surface diffusion mechanism. Adsorption-selective carbon membranes separate non-adsorbable or weakly adsorbable gases (O2, N2, CH4) from adsorbable gases, such as NH3, SO2, H2S and chlorofluorocarbons (CFCs).
The transport through CMSMs is often studied by using the solution (sorption)-diffusion model, because of the simplicity of the model. In this chapter the above model is applied for single gas permeation, and then more complicated model is applied to predict the separation of binary gas mixtures.
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