Infrared evidence for the segregation of silica-supported Pt-Pd bimetallic clusters in oxidizing atmospheres

Journal Article · Fri Aug 01 00:00:00 EDT 1980 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(80)90521-7· OSTI ID:6212250

Grill, C M; Gonzalez, R D

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), Vol. 64:2
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CARBON MONOXIDE
ADSORPTION
CATALYSTS
CHEMICAL COMPOSITION
OXIDATION
REDUCTION
STRUCTURAL CHEMICAL ANALYSIS
PALLADIUM
COPRECIPITATION
INFRARED SPECTRA
SORPTIVE PROPERTIES
PLATINUM
BIMETALS
DISPERSIONS
EXPERIMENTAL DATA
NITRIC OXIDE
NITROGEN DIOXIDE
OXYGEN
SOLID CLUSTERS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
DATA
ELEMENTS
INFORMATION
METALS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
PRECIPITATION
SEPARATION PROCESSES
SORPTION
SPECTRA
SURFACE PROPERTIES
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties