Is There a Distribution of Transition State Energies in the Reaction Coordinate of CO Oxidation on Pt Foil?
The oxidation of CO on the noble metals is one of the few surface catalyzed reactions studied from a dynamic perspective and we have recently reviewed this literature 1. By dynamics, we mean the study of reactions at a level that provides information about the potential energy surface (PES) governing the motion of the nuclei throughout the reaction, usually being satisfied to consider a small region of the PES known as the transition state. Carbon monoxide oxidation is particularly well suited for dynamic studies because product CO2 is thought to desorb immediately after having passed through the transition state and, therefore, the partitioning of reaction energy in the product degrees of freedom should be related more to the structure of the transition state than to the dynamics of desorption of an accommodated CO2 molecule. Indeed, excess translational, rotational, and vibrational energy has been detected in the CO2 produced on the noble metals, direct evidence for the rapidity of the desorption process.
KeywordsPotential Energy Surface Vibrational Level Apparent Temperature Symmetric Stretch High Resolution Spectrum
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