Fe/Mn-based perovskite-type oxides with excellent oxygen permeability and reduction tolerance

Yasutake Teraoka, Hironobu Shimokawa, Hajime Kusaba, Kazunari Sasaki

Research output: Contribution to journalConference article

3 Citations (Scopus)

Abstract

A family of Co-free, Fe/Mn-based perovskite-type oxides, (Sr, A′)(Fe, Mn)O3-δ (A′=La, Ba, Ca), was synthesized, and their oxygen permeability and phase stability in reducing atmosphere were investigated. The substitution of Mn at B site caused the decrease in oxygen permeability. As for the effect of A-site substitution, prominent promotion was observed by the substitution of Ba for 30% of Sr, and Ba0.3Sr 0.7FeO3-δ was found to be one of most excellent oxygen permeable materials with the permeation flux of 3.0 cm3(STP) cm-2 min-1 at 900°C. Reduction tolerance was evaluated by TG measurements in a 5%H2/N2 stream up to 1000°C. After the TG measurements, crystal structures of La-Sr-Co-Fe-O and Sr-Fe-(Mn)-O perovskites were decomposed or transformed into low oxygen permeable phases, but the perovskite-type structure of Ba-Sr-Fe-(Mn)-O survived. The Fe/Mn-based perovskites with high oxygen permeability and exceeding reduction tolerance could be used as stable membrane materials for membrane reactors catalyzing NO-CH4 reaction and the partial oxidation of CR4 into synthesis gas.

Original languageEnglish
Article numberK2.6
Pages (from-to)77-83
Number of pages7
JournalMaterials Research Society Symposium Proceedings
Volume835
Publication statusPublished - 2005
EventSolid State Ionics - 2004 - Boston, MA, United States
Duration: Nov 29 2004Dec 2 2004

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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