Pd-Au/SiO{sub 2}: Characterization and catalytic activity

Journal Article · Sun Jan 01 04:00:00 EST 1995 · Journal of Catalysis

DOI:https://doi.org/10.1006/jcat.1995.1009· OSTI ID:75794

Juszczyk, W; Karpinski, Z; Lomot, D; Pielaszek, J; Sobczak, J W ^[1]

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1. Institute of Physial Chemistry of the Polish Academy of Sciences, Warsaw (Poland)

A series of Pd-Au/SiO{sub 2} catalysts was prepared by incipient wetness coimpregnation of silica with respective chloride solutions, followed by calcination in air and reduction in hydrogen at 380{degrees}C for 15 H. A variety of techniques, chemisorption of hydrogen and carbon monoxide, temperature-programmed reduction, X-ray diffraction, X-ray photoelectron spectroscopy, and neopentane conversion as a catalytic probe, were employed to characterize metal dispersion and interaction between two metal components and the support. It has been discovered that the prepared materials are not uniform: a palladium-rich phase of very high metal dispersion (particle size {approximately}1.3 nm) coexists with much less dispersed gold-rich phase (particle size {approximately}15 nm). X-ray photoelectron spectroscopy revealed some presence of Si{sup

• OSTI ID: 75794
• Journal Information: Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 1 Vol. 151; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

2-2-DIMETHYLPROPANE
40 CHEMISTRY
CARBON MONOXIDE
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHEMISORPTION
CONVERSION
GOLD
HYDROGEN
PALLADIUM
PHOTOELECTRON SPECTROSCOPY
REDUCTION
SILICON OXIDES
STRUCTURAL CHEMICAL ANALYSIS
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY