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Auger electron spectroscopy and mass spectroscopy studies on hydrogenation of graphite in the presence of nickel and tungsten

Journal Article · · J. Catal.; (United States)
; ;

Hydrogenation of polycrystalline graphite in the presence of nickel and tungsten was studied by means of Auger electron spectroscopy and mass spectroscopy at temperatures up to 850K and a hydrogen pressure ranging from 1.10/sup -8/ to 5.10/sup -6/ Torr. The changes in the carbon Auger lineshape with increasing metal surface concentration revealed a tendency to formation of a carbide phase, the latter being much stabler in the case of tungsten. The mass spectrometric studies of the interaction of hydrogen with the metal graphite systems showed the formation of CH/sub 4/ methane at temperatures higher than 750K. The electronic and adsorption properties of the metal-graphite systems and the formation of active surface carbide carbon were considered in explaining the different catalytic activites of nickel and tungsten. 6 figures.

Research Organization:
Bulgarian Academy of Sciences, Sofia
OSTI ID:
5961492
Journal Information:
J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 81:1; ISSN JCTLA
Country of Publication:
United States
Language:
English

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Related Subjects

090121* -- Hydrocarbon Fuels-- Chemical Synthesis-- (1976-1989)
10 SYNTHETIC FUELS
ALKANES
AUGER ELECTRON SPECTROSCOPY
CARBON
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CRYSTALS
DATA
ELECTRON SPECTROSCOPY
ELEMENTAL MINERALS
ELEMENTS
EXPERIMENTAL DATA
GASIFICATION
GRAPHITE
HIGH TEMPERATURE
HIGH VACUUM
HYDROCARBONS
HYDROGEN
HYDROGENATION
INFORMATION
KINETICS
MASS SPECTRA
MEDIUM TEMPERATURE
METALS
METHANE
MINERALS
NICKEL
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
POLYCRYSTALS
PRESSURE DEPENDENCE
QUANTITY RATIO
REACTION KINETICS
SPECTRA
SPECTROSCOPY
STRUCTURAL CHEMICAL ANALYSIS
TEMPERATURE DEPENDENCE
THERMOCHEMICAL PROCESSES
TIME DEPENDENCE
TRANSITION ELEMENTS
TUNGSTEN
YIELDS