The effect of co-existing gases from the process of steam reforming reaction on hydrogen permeability of palladium alloy membrane at high temperatures

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• 作者：Atsushi Unemoto ; Atsushi Kaimai ; Kazuhisa Sato ; Takanori Otake ; Keiji Yashiro ; Junichiro Mizusaki ; Tatsuya Kawada ; Tatsuya Tsuneki ; Yoshinori Shirasaki ; Isamu Yasuda
• 关键词：Membrane reformer ; Palladium alloy membrane ; Hydrogen permeability ; Co-existing gas ; High temperatures
• 刊名：International Journal of Hydrogen Energy
• 出版年：2007
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：September 2007
• 卷：32
• 期：14
• 页码：2881-2887
• 文件大小：307 K

摘要

Hydrogen permeation measurements were carried out by using an Ag 23 wt%-Pd alloy membrane of thickness at temperatures from 773 to 873 K. Contrary to some reported results, hydrogen permeation flux was not affected by the co-existence of H₂O up to 9.5%at 873 and 773 K under non-pressurized conditions. Further addition of CO₂ up to 27.9%, CH₄ 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 H₂O up to 63%, 5%of CO with 30%of H₂O, 20%of CH₄ with 15%of H₂O, 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.