Noble metals supported on Phillips-type catalysts preparation, characterization, and activity for ethane hydrogenolysis
The catalysts were prepared by a one-electron reaction of a chromium(II) reducing function bound to a silica support and silver, palladium, or rhodium complexes in an oxygen-free environment. They were characterized by ESR spectroscopy, X-ray diffraction, transmission electron microscopy, carbon monoxide and hydrogen adsorption, and ethane hydrogenolysis, known to be structure-sensitive on rhodium. The results suggested that part of the palladium is atomically dispersed and very active, but that it deactivates rapidly by formation of carbonaceous deposits and that the catalyst retains a residual activity due to larger particles. The reaction between rhodium and chromium(II) took place less readily than that of platinum, the resulting rhodium was only moderately well dispersed, and its specific activity for ethane was about 100 times greater than reported in literature and relatively stable. The reaction of chromium(II) with silver produced chromium(VI) and inactive silver compounds.
- Research Organization:
- Brunel Univ., Uxbridge
- OSTI ID:
- 6200127
- Journal Information:
- J. Catal.; (United States), Vol. 61:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CATALYSTS
CHEMICAL PREPARATION
CHROMIUM
CATALYTIC EFFECTS
PALLADIUM COMPLEXES
PLATINUM
RHODIUM
ADSORPTION
CARBON MONOXIDE
CARBONACEOUS MATERIALS
CATALYST SUPPORTS
DEACTIVATION
DEPOSITS
ELECTRON SPIN RESONANCE
ETHANE
HYDROGEN
LYSIS
RHODIUM COMPLEXES
SILICA
SILVER COMPLEXES
SILVER COMPOUNDS
SPECIFICITY
STRUCTURAL CHEMICAL ANALYSIS
TRANSMISSION ELECTRON MICROSCOPY
USES
X-RAY DIFFRACTION
ALKANES
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COMPLEXES
DIFFRACTION
ELECTRON MICROSCOPY
ELEMENTS
HYDROCARBONS
MAGNETIC RESONANCE
MATERIALS
METALS
MICROSCOPY
MINERALS
NONMETALS
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
RESONANCE
SCATTERING
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties