Experimental and theoretical investigation on hydrogen permeation with flat sheet Pd/Ag membrane for hydrogen mixture with various inlet H<inf>2</inf> mole fractions and species

Hasan Mohd Faizal, Yuki Kawasaki, Takeshi Yokomori, Toshihisa Ueda

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The estimation of hydrogen permeation mole flux was performed by previously introduced theoretical equation which considers the decrease in H<inf>2</inf> concentration at the membrane surface, and was compared with experimental result, for various hydrogen mixtures with different inlet H<inf>2</inf> mole fractions and species. A flat sheet 77 wt.% Pd/23 wt.% Ag purification membrane with effective surface area of 3.14 × 10<sup>-4</sup> m<sup>2</sup> was used. For H<inf>2</inf>:N<inf>2</inf> mixture, the comparison was performed under various feed flow rates (2.78 × 10<sup>-5</sup>-2.50 × 10<sup>-4</sup> mol/s), for inlet H<inf>2</inf> mole fraction of 0.70-0.80, at reference membrane temperature of 623 K and total upstream pressure of 0.25 MPa. Then, nitrogen was subsequently replaced with argon (Ar), helium (He) and carbon dioxide (CO<inf>2</inf>) to investigate the applicability of the estimation method for various H<inf>2</inf> mixtures with different species. The results demonstrate that the effect of H<inf>2</inf> permeation itself plays a significant role for permeation with H<inf>2</inf> mixture, which induces the phenomenon of concentration polarization. Overall, the introduced method is able to estimate H<inf>2</inf> permeation mole flux for H<inf>2</inf> mixture, both qualitatively and quantitatively, regardless of inlet H<inf>2</inf> mole fraction and species.

Original languageEnglish
Pages (from-to)208-215
Number of pages8
JournalSeparation and Purification Technology
Volume149
DOIs
Publication statusPublished - 2015 Jun 23

Keywords

  • Concentration polarization
  • Hydrogen mixture
  • Hydrogen permeation
  • Membrane
  • Sieverts' equation

ASJC Scopus subject areas

  • Analytical Chemistry
  • Filtration and Separation

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