Ceria-zirconia stabilised tungsten oxides for the production of hydrogen by the methane-water redox cycle

Andrew Sim, Noel W. Cant, David L. Trimm

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)

Abstract

The generation of essentially pure hydrogen through a redox cycle using methane and then water has been investigated for a series of tungsten oxides stabilised by ceria-zirconia. The calcined starting materials were largely monoclinic WO3 with CeO2 and ZrO2 undetectable by XRD. Samples containing 80% and especially 69% WO3 showed additional XRD lines due to a phase of unknown composition. Temperature programmed reduction to 750 °C in methane converted samples containing WO3 alone to WC together with small amounts of tungsten metal and a WC1-x phase. Reoxidation in water at the same temperature then produced CO and H2 in corresponding amounts. Under the same conditions the 69% WO3 sample was reduced only as far as WO 2 and reoxidation yielded H2 largely free of CO. The reoxidation product was not WO3 but consisted of various non-stoichiometric oxides with composition WO2+x (x = 0.72, 0.83, etc). The reduction-reoxidation cycle could be repeated many times without loss of hydrogen production efficiency.

Original languageEnglish
Pages (from-to)8953-8961
Number of pages9
JournalInternational Journal of Hydrogen Energy
Volume35
Issue number17
DOIs
Publication statusPublished - Sep 2010

Keywords

  • Ceria-zirconia
  • Hydrogen production
  • Redox cycle
  • Reduction by methane
  • Reoxidation by water
  • Tungsten oxide

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