Effect of nickel deposition on hydrogen permeation behavior of mesoporous γ-alumina composite membranes

Chang Yeol Yu, Bong Kuk Sea, Dong Wook Lee, Sang Jun Park, Kwan Young Lee, Kew Ho Lee

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12 Citations (Scopus)

Abstract

Ni/alumina composite membranes were prepared and investigated for hydrogen separation at high temperature. α-Alumina-supported γ-alumina composite membranes were prepared by soaking-rolling method. In order to improve H2 selectivity and permeance of the γ-alumina membranes, Ni was deposited by a soaking process. As a result of a single gas permeation test of the Ni/alumina composite membranes, hydrogen permeance and H2/N2 selectivity at permeation temperature of 450 °C were 6.29 × 10-7 mol / m2 s Pa and 5.2 which exceeded theoretical Knudsen selectivity. Contribution of surface diffusion was investigated by temperature dependence of H2 permeance. The surface diffusion was observed at higher temperature above 250 °C. The Ni deposition on surface of the γ-alumina composite membrane led to hydrogen permeation via Knudsen diffusion combined with surface diffusion, which gave high H2 selectivity exceeding the Knudsen diffusion mechanism.

Original languageEnglish
Pages (from-to)470-476
Number of pages7
JournalJournal of Colloid and Interface Science
Volume319
Issue number2
DOIs
Publication statusPublished - 2008 Mar 15

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Keywords

  • Composite membrane
  • Hydrogen separation
  • Nickel
  • Surface diffusion

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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