The infrared chemiluminescence technique was applied to the steady-state CO oxidation by NO on Pd(111) and Pd(110) to measure the internal energy of CO
2 desorbed from surfaces. In this paper, on the basis of the results of CO oxidation by O
2, we elucidate the CO
2 formation mechanism of CO + NO reaction. From the comparison of IR emission spectra of CO
2 between CO + NO and CO + O
2 reactions, it is found that the vibrational energy states of CO
2 in CO + NO reaction are similar to those in CO + O
2 reaction. This indicates that the reaction path of CO
2 formation in CO + NO is the same as that in CO + O
2. The vibrational states are much dependent on the surface structure: the CO
2 molecules produced on flat Pd(111) were highly excited (especially bending mode) than those on Pd(110) which has atomically rough surface.
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