Abstract
The NMR data obtained after adsorbing on Pt by partial oxidation of showed a nonlinear variation of the chemical shift and the linewidth with decreasing particle size, more change for average sizes less than , which can be explained in terms of the variation of relative populations of different CO adsorption sites. There was also a noticeable increase in the chemical shift of CO adsorbed on carbon-supported Pt catalysts as compared to Pt black samples of similar size, which we attribute to a metal-support interaction in the supported catalysts.
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