Polarization phenomena of hydrogen-rich gas in high-permeance Pd and Pd-Cu membrane tubes

Wei-Hsin Chen, Ming Hsien Hsia, Yen Hsun Chi, Yu Li Lin, Chang Chung Yang

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Concentration polarization, a retarding effect upon hydrogen permeation across a membrane, will affect the performance of hydrogen separation. To recognize the concentration polarization behavior of hydrogen-rich gas in high-permeance membrane tubes, three palladium-based membranes with two pure palladium (Pd) membranes and one Pd-Cu alloy membrane are tested. Three important parameters, consisting of the H2 partial pressure difference, the flow rate at the exit of the retentate side and the H2 concentration in the feed gas mixture (H2+N2), are taken into account. A comparison to pure H2 permeation suggests that the concentration polarization is clearly exhibited when the gas mixture is fed. Decreasing the H2 concentration in the feed gas tends to deteriorate the polarization phenomenon. The sensitivity of polarization to H2 concentration is higher when its concentration in the feed gas is larger. For the gas mixtures with 50 and 75vol% of H2, the permeances of the membranes are reduced by 1-2 orders of magnitude. The permeances of the membranes are also affected a bit when the H2 partial pressure difference or the flow rate is altered.

Original languageEnglish
Pages (from-to)41-50
Number of pages10
JournalApplied Energy
Volume113
DOIs
Publication statusPublished - 2014 Jan 1

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Energy(all)
  • Mechanical Engineering
  • Management, Monitoring, Policy and Law

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