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

Atsushi Unemoto, Atsushi Kaimai, Kazuhisa Sato, Takanori Otake, Keiji Yashiro, Junichiro Mizusaki, Tatsuya Kawada, Tatsuya Tsuneki, Yoshinori Shirasaki, Isamu Yasuda

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)

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 H2 O 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 H2 O up to 63%, 5% of CO with 30% of H2 O, 20% of CH4 with 15% of H2 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.

Original languageEnglish
Pages (from-to)2881-2887
Number of pages7
JournalInternational Journal of Hydrogen Energy
Volume32
Issue number14
DOIs
Publication statusPublished - 2007 Sep 1

Keywords

  • Co-existing gas
  • High temperatures
  • Hydrogen permeability
  • Membrane reformer
  • Palladium alloy membrane

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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