Mechanism of the CO oxidation reaction on O-precovered Pt(111) surfaces studied with near-edge x-ray absorption fine structure spectroscopy

I. Nakai, H. Kondoh, K. Amemiya, M. Nagasaka, T. Shimada, R. Yokota, A. Nambu, T. Ohta

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

The mechanism of CO oxidation reaction on oxygen-precovered Pt(111) surfaces has been studied by using time-resolved near-edge x-ray absorption fine structure spectroscopy. The whole reaction process is composed of two distinct paths: (1) a reaction of isolated oxygen atoms with adsorbed CO, and (2) a reaction of island-periphery oxygen atoms after the CO saturation. CO coadsorption plays a role to induce the dynamic change in spatial distribution of O atoms, which switches over the two reaction paths. These mechanisms were confirmed by kinetic Monte Carlo simulations. The effect of coadsorbed water in the reaction mechanism was also examined.

Original languageEnglish
Article number134709
JournalJournal of Chemical Physics
Volume122
Issue number13
DOIs
Publication statusPublished - 2005 Sep 13
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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