Abstract
ZSM-5 zeolite membranes for CO 2 separation have been synthesized via hydrothermal-treating various porous α-alumina tubes in template reaction mixtures. The effect of each support acted as an Al source in high pH solution during hydrothermal treatment, and of the SiO 2 molar ratio in reaction mixtures on the formation of ZSM-5 crystalline layers was investigated. The synthesized membranes were also surface-modified by dip-coating with polymeric silica sol which filled up the intercrystalline voids in order to improve the CO 2 separation efficiency. The ZSM-5 zeolite membranes have been evaluated by the CO 2/N 2 separation factor and permeance measured as a function of the stage cut, the helium sweeping rate, the feed pressure, and the permeation temperature. The maximum separation factor of the ZSM-5 zeolite membrane for a CO 2/N 2 (50% CO 2) gas mixture was about 54.3 at 25 °C and 14.9 at 100 °C, respectively, and its permeance was 3.6 × 10 −8 mol/m 2 s Pa. In particular, it was found that the separation factor of the ZSM-5 zeolite membranes were nearly independent of the moisture in the feed.
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