Structural and catalytic properties of model supported nickel catalysts

Journal Article · Thu Jan 27 00:00:00 EST 1994 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100055a033· OSTI ID:5042389

Coulter, K; Xu, X; Goodman, D W ^[1]

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1. 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), Vol. 98:4; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
CARBON MONOXIDE
METHANATION
CATALYST SUPPORTS
SURFACE PROPERTIES
CHEMICAL REACTIONS
ACTIVATION ENERGY
ETHANE
DECOMPOSITION
HYDROGEN
INFRARED RADIATION
REFLECTION
NICKEL
ABSORPTION SPECTRA
CRYSTAL STRUCTURE
INFRARED SPECTRA
VACUUM EVAPORATION
POWDERS
PARTICLE SIZE
SILICA
CATALYSTS
CHEMICAL REACTION KINETICS
THIN FILMS
VAPOR DEPOSITED COATINGS
ALKANES
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
COATINGS
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY
EVAPORATION
FILMS
HYDROCARBONS
KINETICS
METALS
MINERALS
NONMETALS
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
RADIATIONS
REACTION KINETICS
SILICON COMPOUNDS
SILICON OXIDES
SIZE
SPECTRA
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties
360102 - Metals & Alloys- Structure & Phase Studies