Abstract
IR spectra of CO adsorbed on Pd SiO 2 have been monitored as a function of θ(CO) and isotopic composition x, where x = 12CO ( 12CO + 13CO) . The results show that on rough curved surfaces of small particles of Pd there is no tendency to clustering of CO. Results do not support the idea of chemical (competition) effects. An alternative explanation of the large shifts (Δ v max) observed on flat single crystal planes is suggested: with increasing θ(CO), CO molecules change their adsorption sites. The latter process is absent on small particles of Pd.
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