CO oxidation on Pd(111), Pt(111), and Rh(111) surfaces studied by infrared chemiluminescence spectroscopy

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The infrared (IR) chemiluminescence studies of CO2 formed during steady-state CO oxidationover Pd(111), Pt(111), and Rh(111) surfaces were carried out. Analysis of their emission spectraindicates that the order of the average vibrational temperature (TVAV) values of CO2 formed duringCO oxidation was as follows: Pd(111) > Pt(111) > Rh(111), and the order is coincident with thepotential energy in the transition state expected by the theoretical calculations. Furthermore, it issuggested that the bending vibrational temperature (TVB) can also be influenced by the angle ofO−C−O (∠OCO) of the activated complex in the transition state, which has also been proposed bythe theoretical calculations.