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

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)24002-24007
Number of pages6
JournalJournal of Physical Chemistry B
Volume109
Issue number50
DOIs
Publication statusPublished - 2005 Dec 22
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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