New supported palladium-chromium catalysts: characterization and catalytic properties
- Institut de Recherches sur la Catalyse, Villeurbanne (France)
New silica-supported Pd-Cr catalysts have been prepared either by using mixed inorganic salts of the two metals as precursors or through the deposition of Cr(CO){sub 6} on a monometallic palladium catalyst. Analytic electron microscopy shows that palladium-enriched particles are formed. The EXAFS experiments show that when the reduction temperature reaches 870 K, part of the chromium is reduced and interacts with palladium. In the partial hydrogenation of 1,3-butadiene, these catalysts are less active but 100% selective for the formation of butenes. The explanation, proposed on the basis of hydrogen chemisorption and confirmed by XPS data, is a modification of the electronic structure of palladium, leading to a variation of the adsorption coefficients of the diene and alkenes, compared to the values measured on monometallic palladium catalysts.
- OSTI ID:
- 5556279
- Journal Information:
- Journal of Catalysis; (USA), Vol. 128:1; ISSN 0021-9517
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
02 PETROLEUM
BUTADIENE
HYDROGENATION
CHROMIUM
CATALYTIC EFFECTS
PALLADIUM
BUTENES
CATALYSTS
CHEMICAL PREPARATION
CHEMISORPTION
DEHYDROGENATION
ELECTRON MICROPROBE ANALYSIS
ELECTRONIC STRUCTURE
HYDROGEN
ISOMERIZATION
OXIDATION
PHOTOELECTRON SPECTROSCOPY
REDUCTION
SYNTHESIS
X-RAY SPECTROSCOPY
ALKENES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
DIENES
ELECTRON SPECTROSCOPY
ELEMENTS
HYDROCARBONS
METALS
MICROANALYSIS
NONDESTRUCTIVE ANALYSIS
NONMETALS
ORGANIC COMPOUNDS
PLATINUM METALS
POLYENES
SEPARATION PROCESSES
SORPTION
SPECTROSCOPY
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties
020400 - Petroleum- Processing