Abstract
The adsorption of carbon monoxide on small rhodium particles prepared by vapour deposition of Rh on either MgO or alumina supports has been investigated by static secondary ion mass spectrometry (SSIMS) and temperature-programmed desorption (TPD). Part of the CO molecularly adsorbed on clean particles undergoes dissociation during heating. The dissociation is more important for smaller particles. The intensity ratios Rh n C +/Rh + n and Rh n O +/Rh + n measured by SSIMS have been used to monitor the buildup of surface carbon and oxygen. Carbon recombination with oxygen followed by thermal desorption of CO is associated with the occurrence of high-temperature desorption features and with the disappearance of the carbidic and oxidic relative intensity in SSIMS. Evidence has been obtained for subsurface diffusion of oxygen.
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