title: Reaction-path switching induced by spatial-distribution change of reactants: CO oxidation on Pt(111).
abstract: We studied the mechanism of CO oxidation on O-covered Pt(111) surfaces during CO exposure by means of time-resolved near edge x-ray absorption fine structure spectroscopy. Two distinct reaction processes were found to occur sequentially; isolated O atoms and island-periphery O atoms contribute to each process. Combination of in situ monitoring of the reaction kinetics and Monte Carlo simulations revealed that CO coadsorption plays a role of inducing the dynamic change in spatial distribution of O atoms, which switches over the two reaction paths.
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: A
authors.initials: A
authors.lastname: Nambu
authors.forename: T
authors.initials: T
authors.lastname: Shimada
authors.forename: T
authors.initials: T
authors.lastname: Ohta