Flow dynamics of gases inside hydrotalcite-silica micropores
2017; Elsevier BV; Volume: 246; Linguagem: Inglês
10.1016/j.micromeso.2017.03.021
ISSN1873-3093
AutoresA. D. Wiheeb, Taif Emad Mohammed, Zaid A. Abdel-Rahman, Mohd Roslee Othman,
Tópico(s)Layered Double Hydroxides Synthesis and Applications
ResumoMaxwell-Stefan diffusion with single-site Langmuir isotherm was used to model the flow of gas inside micro pores of HT-Silica membrane. Coupled with Van't Hoff and Arrhenius equations, the diffusivity and energy contributed by the surface affinity and gas kinetics were quantified and evaluated. Results indicate that all of the four gases being studied were affected by the surface affinity to a significant extent. The surface affinity contributed 62% of the energy in the adsorption of CO2, 48% of the energy in the adsorption of CH4, 48% of the energy in the adsorption of N2 and 46% of the energy in the adsorption of H2. This explains the reason for the higher CO2 permeability despite the fact that the CO2 gas molecules are heavier than the other gas molecules being compared in the analysis.
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