Abstract
Single gas and mixture permeances of CO 2 and CH 4 were measured as functions of pressure and temperature through three MFI zeolite membranes that have different fractions of their permeances through non-zeolite pores. The effect of pressure on CO 2 permeance, which was different for each membrane, was fit by a modified surface diffusion model. The differences in the pressure behavior of the membranes are attributed to pores with viscous and Knudsen flow. Membranes with the largest permeation through non-zeolite pores have the lowest CO 2/CH 4 mixture selectivity. The highest CO 2/CH 4 mixture selectivity is 5.5 at room temperature and decreases with temperature because of a decrease in competitive adsorption. Although increasing pressure at constant pressure drop increases the apparent CO 2/CH 4 selectivity, the ratio of the CO 2 and CH 4 fluxes decreases.
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