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Abstract
MFI-type zeolite membranes (Na-ZSM-5 and B-ZSM-5) were prepared on γ-alumina and stainless steel tubular supports and tested for separation of CO 2/N 2 mixtures. The effect of pressure on N 2 and CO 2 flows and selectivity was investigated. The separation between CO 2 and N 2 takes place because of the preferential adsorption of CO 2, which hinders the permeation of N 2 through the zeolite pore network. The best results in this work were obtained with a B-ZSM-5 membrane prepared over a porous stainless steel support. In this case, a CO 2 permeance of 2.66 × 10 −7 mol/(m 2 s Pa) with a CO 2/N 2 separation factor of 13 was obtained. The results of two characterization methods (N 2/SF 6 selectivity and hydrogen permeation in the presence of desorbing butane) are compared, and their relationship with the separation properties of the membranes is examined. The contribution of flow through micropores and intercrystalline pores is discussed.
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