Supported Au-Pt catalysts. Characterization and hydrogen transfer activity between benzene and cyclohexane
Silica-supported catalysts were prepared containing 0.7Vertical Bar3< by wt of metal consisting of 0-100Vertical Bar3< gold and platinum (Series A) or 0.7Vertical Bar3< by wt platinum plus 28-89 atom Vertical Bar3< gold (Series B). The impregnation and pretreatment procedures were identical for both series except for the salt solution concentrations. Catalyst characterization by hydrogen and oxygen adsorption, wide-angle X-ray scattering, and ESCA showed that both series consisted of gold, mixed gold-platinum, and platinum aggregates, and that only Series A had surface enrichment of gold, apparently as a result of differences in nucleation and growth rates of the two metals prepared from differing solutions. The hydrogen transfer between carbon-14 labeled benzene and cyclohexane proceeded at 205/sup 0/C on all catalysts containing platinum, but the rate was proportional to the surface platinum of Series A and it increased with the over-all amount of gold present in Series B. Hydrogen-deuterium equilibration depended similarly on surface platinum atoms in both series. The effect of the gold on the platinum activity for hydrogen transfer may involve an increase in the Fermi level of platinum, thus generating more electron-rich platinum sites.
- Research Organization:
- Univ. of Michigan
- OSTI ID:
- 6811671
- Journal Information:
- J. Catal.; (United States), Vol. 57:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CATALYSTS
CHEMICAL PREPARATION
STRUCTURAL CHEMICAL ANALYSIS
DEUTERIUM
ISOTOPIC EXCHANGE
GOLD
CATALYTIC EFFECTS
PLATINUM
SILICA
BENZENE
CATALYST SUPPORTS
CYCLOHEXANE
EXPERIMENTAL DATA
HYDROGEN TRANSFER
QUANTITY RATIO
SURFACE PROPERTIES
TRACER TECHNIQUES
ALKANES
AROMATICS
CHALCOGENIDES
CYCLOALKANES
DATA
ELEMENTS
HYDROCARBONS
HYDROGEN ISOTOPES
INFORMATION
ISOTOPE APPLICATIONS
ISOTOPES
LIGHT NUCLEI
METALS
MINERALS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
SILICON COMPOUNDS
SILICON OXIDES
STABLE ISOTOPES
SYNTHESIS
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties
400303 - Organic Chemistry- Isotope Exchange & Isotope Separation- (-1987)