Abstract
Silicalite-1 and Al-ZSM-5 membranes were prepared by combining one-step in situ seeding with one secondary membrane growth step. For membranes prepared under similar conditions, Al-ZSM-5 membrane growth was found to be considerably slower than Silicalite-1 growth leading to a significantly higher preferred axial orientation of the Silicalite-1 membranes. H 2/SF 6 single gas permeation measurements revealed that for both membrane types a correlation existed between the H 2/SF 6 ideal perm-selectivities and the zeolite layer thickness. Above a certain thickness the defect density is independent of layer thickness. However, Al-ZSM-5 membrane perm-selectivities were higher, despite lower membrane thicknesses and comparable hydrogen permeation rates. For example, room temperature ideal H 2/SF 6 perm-selectivities of about 136 and 65 were measured for a 7.5 μm thick Al-ZSM-5 and a 45 μm thick Silicalite-1 membrane, respectively. Comparison to literature data revealed that the membranes were of good quality. Moreover, reproducibility of the membrane synthesis procedure proved to be good.
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