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

研究成果: Article査読

3 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)537-542
ページ数6
ジャーナルJournal of the Ceramic Society of Japan
122
1427
DOI
出版ステータスPublished - 2014 7月
外部発表はい

ASJC Scopus subject areas

  • セラミックおよび複合材料
  • 化学 (全般)
  • 凝縮系物理学
  • 材料化学

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