Structural and catalytic properties of model supported nickel catalysts
- Texas A M Univ., College Station, TX (United States)
The surface structure and catalytic properties of model silica-supported nickel catalysts have been investigated with infrared reflection-absorption spectroscopy (IRAS) and reaction kinetics of ethane hydrogenolysis and carbon monoxide methanation. Nickel particles in the range 15-80 [angstrom] were vacuum deposited onto silica thin films using established preparation procedures. Specific rates and activation energies for ethane hydrogenolysis and carbon monoxide methanation over the model catalysts are remarkably similar to the corresponding values for both traditional silica-supported nickel catalysts and nickel single crystals. The turnover frequency for CO methanation is independent of particle size for the dimensions studied. The ethane hydrolysis rate, however, increases with particle size to a maximum at approximately 25 [angstrom] and then decreases. This reactivity trend is found to parallel a change in the percentage of bridging CO on the nickel particles as determined by IRAS. 40 refs., 8 figs.
- OSTI ID:
- 5042389
- Journal Information:
- Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 98:4; ISSN JPCHAX; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102 -- Metals & Alloys-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTRA
ACTIVATION ENERGY
ALKANES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COATINGS
CRYSTAL STRUCTURE
DECOMPOSITION
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY
ETHANE
EVAPORATION
FILMS
HYDROCARBONS
HYDROGEN
INFRARED RADIATION
INFRARED SPECTRA
KINETICS
METALS
METHANATION
MINERALS
NICKEL
NONMETALS
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PHASE TRANSFORMATIONS
POWDERS
RADIATIONS
REACTION KINETICS
REFLECTION
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SIZE
SPECTRA
SURFACE PROPERTIES
THIN FILMS
TRANSITION ELEMENTS
VACUUM EVAPORATION
VAPOR DEPOSITED COATINGS