Abstract
Utilizing Fourier Transform Reflection Absorption-Infrared Spectroscopy (FT-IRAS), we have investigated the CO oxidation reaction in-situ on a Ru(001) surface at high (≈ 10 Torr) pressures. Under certain temperature and reactant (CO and O2) partial pressure conditions, we observe for the first time on unsupported Ru a weakly adsorbed CO species which is characterized by an unusually high C-O stretching frequency of 2140 cm−1. A similar feature has been identified previously on small Ru particles in supported catalysts and attributed by some to a multicarbonyl species (−Ru(CO)n,n > 1). By following the intensity of this feature on Ru(001) relative to other peaks in the spectra, we believe that the 2140 cm−1 peak observed here is most likely due to a highly perturbed linearly adsorbed monocarbonyl on partially oxidized Ru sites generated by locally high concentrations of coadsorbed oxygen.
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