H2S poisoning and regeneration of Ni-BaZr0.1Ce0.7Y0.2O3-δ at intermediate temperature

Shumin Fang, Lei Bi, Chunli Yang, Litao Yan, Chusheng Chen, Wei Liu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Hydrogen permeation flux of Ni-BaZr0.1Ce0.7Y0.2O3-δ cermet (ceramic-metal composite) was measured in an H2S-containing atmosphere at 973 K. In 30 and 60 ppm H2S, the hydrogen permeation flux decreased by about 20% and 30%, respectively. After the removal of H2S, the hydrogen permeation flux recovered partially in several hours and then remained stable. After exposing to 60 ppm H2S, X-ray diffraction (XRD) analysis revealed a little formation of Ni3S2, BaS, and doped CeO2. Thermodynamic calculation results showed that the critical value of pH2S/pH2 for the formation of Ni3S2 was about 0.0066 at 973 K, suggesting that the Ni3S2 found after testing was formed in the cooling process. The reaction between H2S and BaCeO3 was rather weak and could not be the cause of the performance loss. Analysis of poisoning and regeneration behavior suggested that the adsorption of sulfur on nickel surface caused the performance loss.

Original languageEnglish (US)
Pages (from-to)935-939
Number of pages5
JournalJournal of Alloys and Compounds
Volume475
Issue number1-2
DOIs
StatePublished - May 5 2009

Keywords

  • Composite materials
  • Microstructure
  • Solid state reaction
  • X-ray diffraction

ASJC Scopus subject areas

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

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