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Proceedings Paper

Platinized Tin Oxide Catalysts For CO2 Lasers: Effects Of Pretreatment
Author(s): Steven D. Gardner; Gar B. Hoflund; David R. Schryer; Billy T. Upchurch
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Paper Abstract

Platinized tin oxide surfaces used for low-temperature CO oxidation in CO2 lasers have been characterized before and after reduction in CO at 125 and 250°C using ion scattering spectroscopy (ISS) and X-ray photoelectron spectroscopy (XPS). XPS indicates that the Pt is present initially as Pt02. Reduction at 125°C converts the Pt02 to Pt(OH)2 while reduction at 250°C converts the Pt02 to metallic Pt. ISS shows that the Pt in the outermost atomic layer of the catalyst is mostly covered by substrate species during the 250°C reduction. Both the ISS and XPS results are consistent with Pt/Sn alloy formation. The surface dehydration and migration of substrate species over surface Pt and Sn appear to explain why a CO pretreatment at 250°C produces inferior CO oxidation activities compared to a 125°C CO pretreatment.

Paper Details

Date Published: 25 July 1989
PDF: 8 pages
Proc. SPIE 1062, Laser Applications in Meteorology and Earth and Atmospheric Remote Sensing, (25 July 1989); doi: 10.1117/12.951860
Show Author Affiliations
Steven D. Gardner, The University of Florida (United States)
Gar B. Hoflund, The University of Florida (United States)
David R. Schryer, NASA Langley Research Center (United States)
Billy T. Upchurch, NASA Langley Research Center (United States)


Published in SPIE Proceedings Vol. 1062:
Laser Applications in Meteorology and Earth and Atmospheric Remote Sensing
Martin M. Sokoloski, Editor(s)

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