Abstract
Hydrogen permeation measurements were carried out by using an Ag 23 wt%-Pd alloy membrane of 20 μ m thickness at temperatures from 773 to 873 K. Contrary to some reported results, hydrogen permeation flux was not affected by the co-existence of H 2 O up to 9.5% at 873 and 773 K under non-pressurized conditions. Further addition of CO 2 up to 27.9%, CH 4 up to 6.8%, CO up to 4.6% did not reduce the permeation flux. Similarly, permeation flux was not affected in a pressurized system with H 2 O up to 63%, 5% of CO with 30% of H 2 O , 20% of CH 4 with 15% of H 2 O , under 0.29 MPa pressurization at 873 K. From the hydrogen partial pressure dependence of the permeation flux, the rate determining step was concluded to be the bulk diffusion of H in the membrane under the abovementioned conditions.
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