Characterization study of silica-supported platinized tin oxide catalysts used for low-temperature CO oxidation: Effect of pretreatment temperature

Journal Article · Thu Jan 24 04:00:00 EST 1991 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100155a064· OSTI ID:5936904

Gardner, S D; Hoflund, G B ^[1]; Schryer, D R; Upchurch, B T ^[2]

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1. Univ. of Florida, Gainesville (USA)
2. NASA Langley Research Center, Hampton, VA (USA)

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.

• OSTI ID: 5936904
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 95:2; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
426002* -- Engineering-- Lasers & Masers-- (1990-)
CARBON COMPOUNDS
CARBON DIOXIDE LASERS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COMPLEXES
DATA
ELECTRON SPECTROSCOPY
EXPERIMENTAL DATA
GAS LASERS
INFORMATION
ION SCATTERING ANALYSIS
LASERS
NONDESTRUCTIVE ANALYSIS
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
PLATINUM COMPLEXES
SPECTROSCOPY
TIN COMPOUNDS
TIN OXIDES
TRANSITION ELEMENT COMPLEXES