Abstract
The infrared (IR) chemiluminescence spectra of CO2 molecules were measured during the steady-state CO oxidation over Pt(110) and Pt(111) surfaces. Analysis of the IR emission spectra indicates that the bending vibrational temperature (TVB), as well as the antisymmetric vibrational temperature (TVAS), was higher on Pt(110) than on Pt(111). On the Pt(110) surface, the highly excited bending vibrational mode compared to the antisymmetric vibrational mode was observed under reaction conditions at low CO coverage (θCO<0.2) or at high surface temperatures (TS≥700 K). This can be related to the activated complex of CO2 formation in a more bent form on the declined (111) terraces of the Pt(110)(1×2) structure. On the other hand, at high CO coverage (θCO≥0.2) or at low surface temperatures (TS<650 K), TVAS was higher than TVB, which can be caused by the reconstruction of the Pt(110)(1×2) surface to the (1×1) form with high CO coverage.
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