Abstract
The oxygen (1s) binding energy in the non-dissociative adsorption of CO on five metals (Ni, Pt, Cu, W and Mo) is shown to decrease as the heat of adsorption increases. When the heat of adsorption is the same on different metals the O(1s) binding energy is also the same. It is suggested that π bonding (back donation) is the major contribution to the M-CO bond. Correlation of the binding energy with the heat of adsorption suggests that, at 295 K, dissociative adsorption of CO occurs when ΔH ads ≳ 300 kJ mol −1.
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