Oxygen permeation and methane reforming properties of ceria-based composite membranes

H. Takamura, T. Kobayashi, T. Kasahara, A. Kamegawa, M. Okada

Research output: Contribution to journalConference articlepeer-review

42 Citations (Scopus)

Abstract

The preparation and oxygen permeation properties of novel composites of Ce0.9Sm0.1O1.95-x vol% Mn (1.5-0.5y)Co(1+0.5y)Ni0.5O4 (CSO-xMCNO; 5 ≤ x ≤ 25; 0 ≤ y ≤ 1.0) have been investigated. The composites were prepared by the Pechini process to obtain fine microstructures. The composites fired at 1300 °C for 2 h were found to consist of Ce 0.9Sm0.1O1.95 and two different spinel-type oxides. The oxygen flux density of 0.3 mm-thick CSO-15MCNO with y = 1.0 was found to be 1.1 and 7.5 μmol cm-2 s-1 at 1000 °C under He (20 sccm)/air and Ar-10%CH4 (100 scm)/air gradients, respectively. CSO-25MCNO with a larger amount of spinel-type phases exhibited a high oxygen flux density of 6.2 μmol cm-2 s-1 and CO selectivity of 72% at 1000 °C without a conventional reforming catalyst. In addition, Ce0.9Sm0.1O1.95-15 vol% MnFe 2O4 (CSO-15MFO) membranes were prepared by means of tape-casting technique. As a result of the optimization of slurry composition, a crack-free dense membrane with dimensions of 5 cm × 5 cm was successfully prepared after sintering at 1300 °C for 2 h. For the tape-cast 133 μm-thick membrane, an oxygen flux density of 9.5 μmol cm-2 s-1 was attained at 1000 °C. Laminated membranes has been also successfully prepared.

Original languageEnglish
Pages (from-to)1084-1089
Number of pages6
JournalJournal of Alloys and Compounds
Volume408-412
DOIs
Publication statusPublished - 2006 Feb 9
EventProceedings of the Rare Earths'04 in Nara, Japan -
Duration: 2004 Nov 72004 Nov 12

Keywords

  • Electrochemical reaction
  • Electrode materials
  • Hydrogen production
  • Powder metallurgy
  • Syngas production

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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