Properties of novel Al2O3-doped SrCo0.8Fe0.2O3-δ mixed conducting oxides

Zhentao Wu*, Chun Zhang, Xianfeng Chang, Wanqin Jin, Nanping Xu

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

A series of Al2O3-doped SrCo0.8Fe0.2O3-δ (SCFA) mixed conducting oxides were synthesized by the solid-state reaction method. XRD and TG were used to characterize the crystal structure and oxygen nonstoichiometry of the SCFA. The oxygen permeation processes and stability of the SCFA membrane were investigated by high temperature oxygen permeation measurement and thermal decomposition of carbon dioxide (TDCD) coupled with partial oxidation of methane (POM) to syngas. When the doping amount of Al2O3 was lower than 3% (mass), Al3+ cations were found to diffuse into the interstitial sites of SrCo0.8Fe0.2O3-δ (SCF) lattice, which greatly enhanced the structure stability of the materials synthesized. Both the bulk diffusion and surface exchange processes affected the oxygen permeation in SCFA3 [the doping amount of Al2O3 was 3% (mass)], and the characteristic thickness (Lc) of SCF A3 was about 131.5 μm. TDCD-POM reaction (1173 K) indicated that the stability of the Al2O3-doped SrCo0.8Fe0.2O3-δ was better than that of the ZrO2-doped SrCo0.4Fe0.6O3-δ (SCFZ).

Original languageEnglish
Pages (from-to)1979-1985
Number of pages7
JournalHuagong Xuebao/Journal of Chemical Industry and Engineering (China)
Volume57
Issue number8
Publication statusPublished - 1 Aug 2006

Keywords

  • AlO
  • Doping
  • MIEC oxide
  • Oxygen permeation

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