Infrared evidence for the segregation of silica-supported Pt-Pd bimetallic clusters in oxidizing atmospheres
Journal Article
·
· J. Catal.; (United States)
Silica-supported coprecipitated 1:1 platinum-palladium catalysts of 18% metal dispersion were prepared and carbon monoxide adsorption was studied by IR spectroscopy for the air oxidized or hydrogen-reduced catalyst forms. The intensity of the bridged CO species with bands below 2000/cm was used as an indicator for surface segregation of palladium. The results showed that the metal clusters are bimetallic clusters after the initial reductions, and that they segregate into palladium- and platinum-rich clusters in the presence of oxygen or nitrogen dioxide formed from nitric oxide and carbon monoxide.
- Research Organization:
- Univ. of Rhode Island
- OSTI ID:
- 6212250
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 64:2; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
BIMETALS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COPRECIPITATION
DATA
DISPERSIONS
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
INFRARED SPECTRA
METALS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN DIOXIDE
NITROGEN OXIDES
NONMETALS
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PALLADIUM
PLATINUM
PLATINUM METALS
PRECIPITATION
REDUCTION
SEPARATION PROCESSES
SOLID CLUSTERS
SORPTION
SORPTIVE PROPERTIES
SPECTRA
STRUCTURAL CHEMICAL ANALYSIS
SURFACE PROPERTIES
TRANSITION ELEMENTS
400201* -- Chemical & Physicochemical Properties
ADSORPTION
BIMETALS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COPRECIPITATION
DATA
DISPERSIONS
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
INFRARED SPECTRA
METALS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN DIOXIDE
NITROGEN OXIDES
NONMETALS
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PALLADIUM
PLATINUM
PLATINUM METALS
PRECIPITATION
REDUCTION
SEPARATION PROCESSES
SOLID CLUSTERS
SORPTION
SORPTIVE PROPERTIES
SPECTRA
STRUCTURAL CHEMICAL ANALYSIS
SURFACE PROPERTIES
TRANSITION ELEMENTS