title: Mechanism of the CO oxidation reaction on O-precovered Pt(111) surfaces studied with near-edge x-ray absorption fine structure spectroscopy.
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.
authors.affiliation: Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: I
authors.initials: I
authors.lastname: Nakai
authors.forename: H
authors.initials: H
authors.lastname: Kondoh
authors.forename: K
authors.initials: K
authors.lastname: Amemiya
authors.forename: M
authors.initials: M
authors.lastname: Nagasaka
authors.forename: T
authors.initials: T
authors.lastname: Shimada
authors.forename: R
authors.initials: R
authors.lastname: Yokota
authors.forename: A
authors.initials: A
authors.lastname: Nambu
authors.forename: T
authors.initials: T
authors.lastname: Ohta