Platinized Tin Oxide Catalysts For CO2 Lasers: Effects Of Pretreatment

Steven D. Gardner; Gar B. Hoflund; David R. Schryer; Billy T. Upchurch

doi:10.1117/12.951860

25 July 1989 Platinized Tin Oxide Catalysts For C_O2 Lasers: Effects Of Pretreatment

Steven D. Gardner, Gar B. Hoflund, David R. Schryer, Billy T. Upchurch

Proceedings Volume 1062, Laser Applications in Meteorology and Earth and Atmospheric Remote Sensing; (1989) https://doi.org/10.1117/12.951860
Event: OE/LASE '89, 1989, Los Angeles, CA, United States

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.

Citation Download Citation

Steven D. Gardner, Gar B. Hoflund, David R. Schryer, and Billy T. Upchurch "Platinized Tin Oxide Catalysts For C_O2 Lasers: Effects Of Pretreatment", Proc. SPIE 1062, Laser Applications in Meteorology and Earth and Atmospheric Remote Sensing, (25 July 1989); https://doi.org/10.1117/12.951860

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