Electron microdiffraction study of Pt-Sn-alumina reforming catlaysts

Journal Article · Wed May 01 04:00:00 EDT 1991 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(91)90028-3· OSTI ID:5621292

Srinivasan, R; Rice, L A; Davis, B H ^[1]

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1. Univ. of Kentucky, Lexington (USA)

An electron microdiffraction technique was employed to identify crystal structures developed in two Pt-Sn-alumina catalysts. One catalyst was prepared by coprecipitating Sn and Al and then impregnating the calcined material with hexachloroplatinic acid to give a Pt:Sn=1.3 atomic ratio. The second catalyst was prepared by coimpregnating Degussa Al{sub 2}O{sub 3} with an acetone solution of H{sub 2}PtCl{sub 6} and SnCl{sub 4} to provide a Pt:Sn ratio of 1:3. Pt-Sn alloy was not detected by X-ray diffraction for coprecipitated catalyst although evidence for Pt-Sn alloy was found for the coimpregnated catalyst. However, electron microdiffraction studies clearly showed evidence for Pt:Sn=1:1 (hcp) alloy phase in both the catalysts. Evidence for the presence of minor amounts of Pt:Sn=1:2 (fcc) phase was also found for the coprecipitated catalyst. EDX analysis of selected particles show that the dominant alloy is Pt:Sn=1:1 for the coimpregnated catalyst. However, for the coprecipitated catalyst, most of the Pt appear as the metal, and not an alloy. Much of the tin is not detected by EDX for the coprecipitated catalyst.

• OSTI ID: 5621292
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 129:1; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400 -- Petroleum-- Processing
36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BIMETALS
CATALYST SUPPORTS
CATALYSTS
CATALYTIC REFORMING
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COAL TAR OILS
COHERENT SCATTERING
COPRECIPITATION
CRYSTAL STRUCTURE
DIFFRACTION
DISTILLATES
ELECTRON DIFFRACTION
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
IMPREGNATION
METALS
NAPHTHA
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PETROLEUM
PETROLEUM DISTILLATES
PETROLEUM FRACTIONS
PLATINUM
PLATINUM METALS
PRECIPITATION
REFORMER PROCESSES
SCATTERING
SEPARATION PROCESSES
SPECTROSCOPY
SYNTHESIS
TIN
TRANSITION ELEMENTS
X-RAY SPECTROSCOPY