Hydrogasification of carbon catalyzed by nickel
A study was conducted to clarify the nature of the low temperature reactions in the interaction between coal and catalyst. Emphasis was placed on the behavior of nickel. The dispersion of Ni on carbon surface was examined using x-ray diffraction, scanning electron microscope and a magnetic measurement. The two temperature regions were R-1 400/sup 0/ and 700/sup 0/C, the lower one; and R-2 above 800/sup 0/C, the higher one. The deactivation by heating about the R-1 region is due to a change in the dispersion of Ni. Nickel particles continue to grow during R-2. Two types of possible mechanisms of catalytic gasification were discussed: (1) hydrogen dissociates on the catalyst surface and spills over to carbon surface, and (2) catalyst modifies the C--C bonds to enhance the reactivity. 4 figures, 4 tables.
- Research Organization:
- Tohoku Univ., Sendai, Japan
- OSTI ID:
- 5955733
- Report Number(s):
- CONF-790415-P3
- Journal Information:
- Prepr., Div. Pet. Chem., Am. Chem. Soc.; (United States), Journal Name: Prepr., Div. Pet. Chem., Am. Chem. Soc.; (United States) Vol. 24:2; ISSN ACPCA
- Country of Publication:
- United States
- Language:
- English
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38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600 -- Radiation Chemistry
CARBON
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL ANALYSIS
COAL GASIFICATION
COHERENT SCATTERING
DIFFRACTION
DISPERSIONS
DISSOCIATION
ELECTRON SCANNING
ELEMENTS
GASIFICATION
HYDROGEN COMPOUNDS
KINETICS
METALS
MICROSCOPES
NICKEL
NONMETALS
OXYGEN COMPOUNDS
QUALITATIVE CHEMICAL ANALYSIS
REACTION KINETICS
REACTIVITY
SCATTERING
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
WATER
X-RAY DIFFRACTION