Abstract
In order to elucidate the unusual catalytic behavior of ruthenium in the oxidation of CO, we have studied this reaction on a Ru(001) single crystal surface at high pressures with in-situ Fourier Transform-Infrared Reflection Absorption Spectroscopy (FT-IRAS). From the measurement of the steady-state surface coverages we are able to obtain estimates of mean residence times of the reactants. Under highly oxidizing conditions, where an O-(1×1) layer is present at the surface and the CO 2 formation rate exhibits a maximum, we find CO residence times in the order of 10 −12 s. This suggests that the oxidation of CO may occur by direct reaction between gas-phase CO and chemisorbed oxygen atoms.
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