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

摘要

The infrared (IR) chemiluminescence studies of CO_2 formed during steady-state CO oxidation over Pd(111), Pt(111), and Rh(111) surfaces were carried out. Analysis of their emission spectra indicates that the order of the average vibrational temperature (T_V~(AV)) values of CO_2 formed during CO oxidation was as follows: Pd(111) > Pt(111) > Rh(111), and the order is coincident with the potential energy in the transition state expected by the theoretical calculations. Furthermore, it is suggested that the bending vibrational temperature (T_V~B) can also be influenced by the angle of O-C-O (∠_(OCO)) of the activated complex in the transition state, which has also been proposed by the theoretical calculations.