Diffusion patterns of gas flow through clay alumina supported DDR Zeolite Membrane

摘要

Generation of clean hydrogen energy involves separation of H2 from CO2 mixture by a Deca Dodecasil Rhombohedral (DDR) zeolite membrane. Permeance, permeability coefficient and selectivity of such a membrane contribute to the membrane efficiency. These parameters are usually controlled by the gas transport properties of the membrane which is directly related to diffusion mechanisms of gaseous components through the membrane pores. In this study, transport phenomena namely the Viscous, Knudsen and Molecular Sieving have been evaluated to analyze the contribution of each flux to the individual H2 and CO2 and their gas mixture through the zeolite membrane. To study the flow properties of the supported membrane, a simple, two-parameter, steady state model was formulated based on the analytical solution of the dusty gas model for both H2 and CO2. Maximum percentage deviation between the experimental data and the model predictions was 6%. This reasonably low value validates the proposed model. By and large good agreement between calculated and experimental fluxes confirms the computational and theoretical premises of the study.