Preparation, characterization, and catalytic properties of NdSrCu1-xCoxO4-δ and Sm1.8Ce0.2Cu1-xCoxO 4+δ (x = 0, 0.2 and 0.4) for methane combustion

Jiguang Deng, Lei Zhang, Hongxing Dai*, Hong He, Chak Tong AU

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

Single-phase perovskite-like oxides NdSrCu1-xCoxO4-δ and Sm1.8Ce0.2Cu1-xCoxO4+ δ (x = 0, 0.2, and 0.4) were prepared using the citric acid complexing method coupled with ultrasonic treatment. We characterized the materials by a number of analytical techniques. It was found that the NdSrCu1-xCoxO4-δ and Sm1.8Ce0.2Cu1-xCoxO4+ δ catalysts possess T and T′ crystal structures, respectively. There are Cu3+/Cu2+ ions and oxygen vacancies in the former and Cu2+/Cu+ ions and extra (over-stoichiometric) oxygen in the latter. We examined the catalytic activity of the materials for methane combustion. Methane conversion increased with a rise in the amount of nonstoichiometric oxygen over the two series of catalysts. It is concluded that oxygen nonstoichiometry and Cu3+/Cu2+ or Cu2+/Cu+ redox couples facilitate the oxidation of methane over the NdSrCu1-xCoxO4-δ and Sm1.8Ce0.2Cu1-xCoxO4+ δ catalysts.

Original languageEnglish
Pages (from-to)87-96
Number of pages10
JournalApplied Catalysis B: Environmental
Volume89
Issue number1-2
DOIs
Publication statusPublished - 3 Jul 2009

Scopus Subject Areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

User-Defined Keywords

  • Methane combustion
  • NdSrCuCoO
  • Oxygen nonstoichiometry
  • Perovskite-like oxide catalysts
  • SmCeCuCoO

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