Edinburgh Napier University

  The present work is focusing on the utilization of previously fabricated membrane to study the effect of pressure drop and temperature on permeability. Mass transfer considerations were used under previously optimized conditions. Subsequently, gas permeation study was conducted on ceramic membranes in CO2 and small molecules present in biogas and it was found that the permeance of CO2 and CH4 nm, according to the decrease in pore size of the membranes. The transport of pure gases through a microporous composite membrane is also discussed. The membrane consists of an 2 washcoat top (separation) layer. The theory of Knudsen diffusion, laminar flow and Darcy flow are used to describe the transport mechanisms. It appears for the composite membrane that Knudsen diffusion occurs in the top layer and combined Knudsen diffusion/laminar flow in the support at pressure lev transport process that takes over in a non-porous membrane is solution-diffusion-is a far simpler process than the complex, surface-mediated adsorption-surface diffusion occurring in the finest-scale porous membranes. For all experiments described below, the gauge pressure was kept lower than these critical pressures.