Abstract
Pt/SnO{sub 2} surfaces supported on SiO{sub 2}, used for low-temperature CO oxidation in CO{sub 2} lasers, have been characterized before and after reduction in CO at 125 and 250{degree}C using ion scattering spectroscopy (ISS) and x-ray photoelectron spectroscopy (XPS). XPS indicates that the Pt is present initially as PtO and PtO{sub 2} and small amounts of Pt(OH){sub 2} and metallic Pt. Reduction at 125{degree}C converts most of the Pt to Pt(OH){sub 2} while reduction at 250{degree}C converts most of the Pt to metallic Pt. The SnO{sub 2} appears to be partially reduced to SnO. ISS results suggest that during the 250{degree}C reduction the Pt and Sn in the outermost atomic layer of the catalyst are covered by impurities originating from the silica substrate whereas reduction at 125{degree}C enriches the outermost atomic layer in Pt and Sn. Both the ISS and XPS data are consistent with the assertion that a Pt/Sn alloy forms during the reduction.
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