IR chemiluminescence probe of the vibrational energy distribution of CO2 formed during steady-state CO oxidation on Pt(111) and Pt(110) surfaces

Kenji Nakao, Shin Ichi Ito, Keiichi Tomishige, Kimio Kunimori

研究成果: Article査読

12 被引用数 (Scopus)

抄録

The infrared (IR) chemiluminescence spectra of CO2 were measured during the steady-state CO + O2 reaction over Pt(110) and Pt(111) surfaces. Analysis of the IR emission spectra indicates that the bending vibrational temperature (TvB), as well as the antisymmetric vibrational temperature (TvAS), was higher on Pt(110) than on Pt(111). On the Pt(110) surface, the highly excited bending vibrational mode compared to the antisymmetric vibrational mode was observed under reaction conditions at low CO coverage (θco < 0.2) or at high surface temperatures (Ts ≥ 700 K). This can be related to the activated complex of CO2 formation in a more bent form on the inclined (111) terraces of the Pt(110)(1 × 2) structure. On the other hand, at high CO coverage (θcoco > 0.2) or at low surface temperatures (Ts < 650 K), TvAS was higher than TvB, which can be caused by the reconstruction of the Pt(110)(1 × 2) surface to the (1 × 1) form with high CO coverage.

本文言語English
ページ(範囲)24002-24007
ページ数6
ジャーナルJournal of Physical Chemistry B
109
50
DOI
出版ステータスPublished - 2005 12月 22
外部発表はい

ASJC Scopus subject areas

  • 物理化学および理論化学
  • 表面、皮膜および薄膜
  • 材料化学

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