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), Journal Name: Journal of Catalysis; (USA) Vol. 128:1; ISSN 0021-9517; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020400 -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKENES
BUTADIENE
BUTENES
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL ANALYSIS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CHEMISORPTION
CHROMIUM
DEHYDROGENATION
DIENES
ELECTRON MICROPROBE ANALYSIS
ELECTRON SPECTROSCOPY
ELECTRONIC STRUCTURE
ELEMENTS
HYDROCARBONS
HYDROGEN
HYDROGENATION
ISOMERIZATION
METALS
MICROANALYSIS
NONDESTRUCTIVE ANALYSIS
NONMETALS
ORGANIC COMPOUNDS
OXIDATION
PALLADIUM
PHOTOELECTRON SPECTROSCOPY
PLATINUM METALS
POLYENES
REDUCTION
SEPARATION PROCESSES
SORPTION
SPECTROSCOPY
SYNTHESIS
TRANSITION ELEMENTS
X-RAY SPECTROSCOPY