Methanation activity of catalysts formed by treating intermetallic components (Ni/sub 5/Si/sub 2/, Ni/sub 2/Si, and Co/sub 2/Si) with oxygen
The University of Pittsburgh has examined oxidized Ni/sub 5/Si/sub 2/, Ni/sub 2/Si, and Co/sub 2/Si as methanation catalysts. X-ray diffraction measurements show that oxidation partially transforms these intermetallics into Ni or Co supported on silica. The catalytic activity for forming methane from synthesis gas is considerably higher than that of a supported transition-metal catalyst formed by conventional wet chemical techniques. The activity varies significantly with pertinent oxidation parameters: For oxidation at a given temperature, the activity increases in proportion to the oxygen uptake by the compound. The activities were highest when the sample was oxidized at temperatures of 660/sup 0/-840/sup 0/F (350/sup 0/-450/sup 0/C). Oxidation at higher temperatures resulted in a reduced methanation activity.
- OSTI ID:
- 6911601
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 83:25; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COBALT COMPOUNDS
COBALT SILICIDES
FLUIDS
GASES
KINETICS
METHANATION
MINERALS
NICKEL COMPOUNDS
NICKEL SILICIDES
OXIDATION
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
SILICA
SILICIDES
SILICON COMPOUNDS
SILICON OXIDES
SYNTHESIS GAS
TRANSITION ELEMENT COMPOUNDS