Synthesis and oxygen permeation properties of ceramic-metal dual-phase membranes

Jinsoo Kim, Y. S. Lin

Research output: Contribution to journalArticle

69 Scopus citations

Abstract

Percolative and non-percolative fluorite type Bi1.5Y0.3Sm0.2O3 (BYS) and silver dual-phase membranes were prepared by mixing BYS and Ag powders. Oxygen permeation and electric conduction through these BYS/Ag dual- phase membranes were studied in the temperature range of 650-850°C. The percolative BYS/Ag 40% and non-percolative BYS/Ag 30% membranes exhibit about 50-fold and 10-fold increase, respectively, in oxygen permeation flux compared to BYS membranes. For a 1.3 mm thick BYS/Ag 40% membrane, an oxygen permeation flux of 5.8 x 10-7 mol/cm2 s was measured at 850°C with oxygen partial pressures at the feed and permeate sides being 0.21 and 0.009 atm, respectively. The activation energies for oxygen permeation in the temperature range of 650-850°C are 79.30 and 87.30 kJ/mol for the BYS/Ag 30% and BYS/Ag 40% membranes, respectively. For the non-percolative BYS/Ag membrane, the presence of Ag enhances the surface reaction rate for oxygen permeation. The continuous silver phase in the percolative BYS/Ag membrane increases both the electronic conductivity and surface reaction rate which result in substantial improvement of oxygen permeance. (C) 2000 Elsevier Science B.V.

Original languageEnglish (US)
Pages (from-to)123-133
Number of pages11
JournalJournal of Membrane Science
Volume167
Issue number1
DOIs
StatePublished - Mar 14 2000
Externally publishedYes

Keywords

  • Bismuth oxide
  • Dual-phase membrane
  • Oxygen permeation
  • Silver

ASJC Scopus subject areas

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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