Oxygen permeation properties and surface modification of acceptor-doped CeO2/MnFe2O4 composites

Hitoshi Takamura, Hiroshi Sugai, Masato Watanabe, Takehiro Kasahara, Atsunori Kamegawa, Masuo Okada

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

The preparation and oxygen permeation properties of the (Ce 0.8Pr0.2)O2-δ - x vol% MnFe 2O4 composites, where x = 0 to 35, have been investigated. The samples were prepared by the Pechini method. In the case of Ce 0.8Pr0.2O2-δ, an oxygen flux density of 6 μmol•cm-2•s-1 (L = 0.0247 cm) and the maximum methane conversion of 50% were attained at 1000°C. Unlike composites consisting of Gd-doped CeO2 and MnFe2O4, the oxygen permeability of the (Ce0.8Pr0.2)O 2-δ - x vol% MnFe2O4 composites was almost constant regardless of the volume fraction of MnFe2O 4; however, the optimum volume fraction of MnFe2O 4 was determined to be 5 to 25 in the context of the chemical and mechanical stabilities under methane conversion atmosphere. In addition, the surface modification of the (Ce0.8Gd0.2)O 2-δ - 15 vol% MnFe2O4 composite was performed by using the FePt nanoparticles. The catalyst loading of 2.8 mg/cm2 on the both side of the 0.3 mm-thick (Ce0.8Gd 0.2)O2-δ - 15vol% MnFe2O4 composite increased the oxygen flux density from 0.30 to 0.76 μmol•cm-2•s-1 in the case of He/air gradients; however, the effect seems to be reduced in the case of high oxygen flux density caused by a large pO2 gradient. Moreover, the Langmuir-Blodgett film of the FePt nanoparticles were successfully prepared on the tape-cast (Ce0.8Gd0.2)O2-δ - 15vol% MnFe2O4 composite. Hydrophobic treatments for the surface of the composite were crucial to achieve high transfer ratio for the deposition of the LB film.

Original languageEnglish
Pages (from-to)741-748
Number of pages8
JournalJournal of Electroceramics
Volume17
Issue number2-4
DOIs
Publication statusPublished - 2006 Dec 1

Keywords

  • FePt nanoparticles
  • Langmuir-Blodgett film
  • Methane conversion
  • Oxygen permeable ceramics
  • Pr-doped ceria

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering
  • Materials Chemistry

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