Surface characterization study of the reduction of an air-exposed Pt sub 3 Sn alloy, IV

Journal Article · Fri Sep 01 04:00:00 EDT 1989 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(89)90144-9· OSTI ID:7128453

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

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

Ion scattering spectroscopy (ISS), angle-resolved Auger electron spectroscopy, and electron spectroscopy for chemical analysis (ESCA or XPS) have been used to examine the reduction (300 C under 1 Torr of H{sub 2} for 1 h) of an air-exposed, polycrystalline Pt{sub 3}Sn alloy surface. Initially, the surface was covered with a thick tin oxide layer. The reduction resulted in a loss of oxygen particularly from the near-surface region, migration of Pt to the surface from a tin-depleted Pt region lying beneath the tin oxide layer, and reduction of tin oxide to metallic tin which alloys with the Pt which migrated to the near-surface region. ISS shows that the outermost atomic layer of the reduced surface contains a large amount of Pt which probably occupies vacancies left by oxygen.

• OSTI ID: 7128453
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 119:1; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

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36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
AIR
ALLOYS
AUGER ELECTRON SPECTROSCOPY
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC REFORMING
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CRYSTALS
ELECTRON SPECTROSCOPY
FLUIDS
GASES
HYDROCARBONS
ION SCATTERING ANALYSIS
LAYERS
NONDESTRUCTIVE ANALYSIS
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PLATINUM ALLOYS
PLATINUM METAL ALLOYS
POLYCRYSTALS
REDUCTION
REFORMER PROCESSES
SPECTROSCOPY
SURFACE PROPERTIES
TIN ALLOYS
TIN COMPOUNDS
TIN OXIDES