Adsorption of O2 and N2O on carbon-covered Ru(001) surfaces

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Abstract
The dissociative chemisorption of N2O and O2 on carbon-covered Ru(001) surfaces has been studied by Auger electron spectroscopy. Small amounts of carbon sharply lower the dissociative probability for N2O as compared to O2. Carbon blocks sites for atomic oxygen adsorption and one monolayer of carbon removes the dissociation activity for O2 and N2O. The results are interpreted in terms of a significant effect of carbon on the N2O molecular precursor state and in terms of more restrictive surface site requirements for N2O as compared to O2.