Adsorption of CO on Iron Single Crystal Surfaces

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Abstract
The adsorption of carbon monoxide on a stepped Fe(111) surface around 300 K was studied by low energy electron diffraction, thermal desorption spectroscopy and Auger electron spectroscopy. Similar detailed experiments on Fe(110) and (111), some of which were reported in Surf. Sci. 75 (1978) 46, were also performed. On a stepped (111) surface, CO adsorption produced a diffuse pattern very similar to the (1×1) pattern obtained with a flat (111) surface. Thermal desorption spectra from the stepped (111) surface showed two kinds of desorption states, α- and β-CO, as from the (110) and (111) surfaces, which are ascribed to molecularly and dissociatively adsorbed CO, respectively. The spectra also showed that the catalytic activity of C-O bond breaking was higher on the stepped (111) surface than on the (111) and (110) surfaces. The effect on CO adsorption of residual carbon on iron surfaces is almost negligible, while that of residual oxygen is high.

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