Supported Au-Pt catalysts. Characterization and hydrogen transfer activity between benzene and cyclohexane

Journal Article · Sun Apr 01 04:00:00 EST 1979 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(79)90031-9· OSTI ID:6811671

Galvagno, S; Parravano, G

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), Journal Name: J. Catal.; (United States) Vol. 57:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical &amp; Physicochemical Properties
400303 -- Organic Chemistry-- Isotope Exchange &amp; Isotope Separation-- (-1987)
ALKANES
AROMATICS
BENZENE
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
CYCLOALKANES
CYCLOHEXANE
DATA
DEUTERIUM
ELEMENTS
EXPERIMENTAL DATA
GOLD
HYDROCARBONS
HYDROGEN ISOTOPES
HYDROGEN TRANSFER
INFORMATION
ISOTOPE APPLICATIONS
ISOTOPES
ISOTOPIC EXCHANGE
LIGHT NUCLEI
METALS
MINERALS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
QUANTITY RATIO
SILICA
SILICON COMPOUNDS
SILICON OXIDES
STABLE ISOTOPES
STRUCTURAL CHEMICAL ANALYSIS
SURFACE PROPERTIES
SYNTHESIS
TRACER TECHNIQUES
TRANSITION ELEMENTS