Enhancement by praseodymium addition of catalytic activity of nickel supported on cerium-zirconium oxide in methane steam reforming

Tomohiro Ishiyama, Kota Kurimoto, Masao Kita, Shinya Otsuka-Yao-Matsuo, Takahisa Omata

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The performances in methane steam reforming of Ni catalysts supported on (Ce0.75Zr0.25)O2-y (CZ) and (Ce 0.75/1.025Zr0.25/1.025-Pr 0.025/1.025)O2-y (CZP), which were fired at various temperatures before Ni deposition, were studied. The catalytic activities of the Ni/CZP catalysts were several per cent higher than those of the Ni/CZ catalysts in terms of both CH4 conversion and H2 yield. Distinct catalytic activities were observed, even after oxidation, for Ni/CZP with supports pre-fired at 1073 and 1273 K. These observations are discussed in terms of the structural characteristics of the catalysts. The X-ray diffraction profiles and Raman spectra indicated that CZP was a mixture of two phases, i.e., a Pr-rich λ phase and a Ce-rich cubic phase. The higher catalytic performances of the Ni/CZP catalysts than of the Ni/CZ catalysts and the retention of catalytic activity even after oxidation were attributed to a strained but coherent interface between the λ phase and the cubic phase, at which oxygen vacancies were easily formed. The Ni/CZ catalyst with the CZ support pre-fired at 1273K also showed distinct catalytic activity even after oxidation. The activity of Ni/CZ after oxidation was also attributable to an active interface between a Zr-rich tetragonal phase and a Ce-rich cubic phase, similar to the case of the Ni/CZP catalyst.

Original languageEnglish
Pages (from-to)537-542
Number of pages6
JournalJournal of the Ceramic Society of Japan
Volume122
Issue number1427
DOIs
Publication statusPublished - 2014 Jul
Externally publishedYes

Keywords

  • Hydrogen production
  • Methane steam reforming
  • Praseodymium oxide
  • Raman spectroscopy
  • X-ray diffraction

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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