Abstract
Faujasite-type zeolite membranes were reproducibly synthesized by hydrothermal reaction on the outer surface of a porous α-alumina support tube of 30 or 200 mm in length. The membrane properties were evaluated by CO 2 separation from an equimolar mixture of CO 2 and N 2 at a permeation temperature of 40°C. CO 2 permeance and CO 2/N 2 selectivity of the NaY-type membranes were in the ranges of 0.4×10 −6–2.5×10 −6 mol m −2 s −1 Pa −1 and 20–50, respectively. The NaY-type membranes were ion-exchanged with alkali and alkaline earth cations. The LiY-type membrane showed the highest N 2 permeance and the lowest CO 2/N 2 selectivity. The KY-type membrane gave the highest CO 2/N 2 selectivity. The NaY-type membrane was stable against exposure to air at 400°C. NaX-type zeolite membranes, formed by decreasing the ratio of SiO 2/Al 2O 3 in the starting solution, exhibited lower CO 2 permeances and higher CO 2/N 2 selectivities than those of the NaY-type zeolite membranes.
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