Carbon monoxide oxidation on the kinked Pt(321) surface

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Abstract
Carbon monoxide oxidation has been studied using high resolution electron energy loss spectroscopy, temperature programmed reaction (TPR), and titration of adsorbed atomic oxygen on a kinked Pt(321) surface characterized using Auger electron spectroscopy and low energy electron diffraction. Two previous papers detail adsorption and dissociation of oxygen and adsorption of carbon monoxide on the Pt(321) surface. Vibrational spectra taken during interrupted reaction experiments clearly indicate that atomic oxygen adsorbed on terraces reacts with CO more rapidly than atomic oxygen adsorbed near the kinked step sites. The multiple reaction limited CO2 peaks observed in the 100–400 K region can be rationalized by proposing that the activation energy for reaction of terrace and step CO with terrace and step atomic oxygen is sufficiently different to cause discernible CO2 peaks as the various species are sequentially depleted by reaction during a TPR experiment.