Flow dynamics of gases inside hydrotalcite-silica micropores

The Maxwell-Stefan with single site Langmuir isotherm was able to model the flow of CO2, CH4, N2 and H2 gas molecules across HT-silica micro pores such as shown in Figure. This enables us to simulate and quantify the diffusivity and energy contributed by the surface affinity. Our analysis shows that CO2 gas molecules were strongly adsorbed along the micro pores through surface affinity at low temperature. At higher temperature, all the gases investigated in this work show increasing diffusivity. However, CO2 appears to diffuse more rapidly and reached the level of the most diffusive gas, H2 at 463 K. The significant increase in diffusivity of CO2 at increasing temperature can be attributed to the combined affinitive and kinetic effect. Figure. Simulated and experimental data of single gas fluxes of CO2, H2, N2 and CH4 through HT-silica membrane as a function of operating temperature at constant pressure difference of 500 kPa.136