Abstract
A comparative study of the infrared spectra of CO, NO, and a CONO mixture on Pt/SiO 2, Rh/SiO 2, and a Pt 0.5-Rh 0.5 alloy/SiO 2 catalyst has been made at five different temperatures: 300, 350, 425, 525, and 625 K. Evidence is found for both Pt and Rh sites on the surface of the alloy catalyst. The CO molecules have the tendency to coordinate to Pt sites, whereas the NO molecules coordinate primarily to Rh sites. A mixed Pt-Rh dual site is proposed to explain the position of v(CO) for the multiply coordinated CO species.
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