Iron alloy Fischer-Tropsch catalysts. II. Carburization studies of the Fe-Ni system
Journal Article
·
· J. Catal.; (United States)
OSTI ID:6813806
The formation of carbides on a series of Fe/SiO/sub 2/, Ni/SiO/sub 2/, and 4Fe:Ni/SiO/sub 2/ catalysts has been investigated in both isothermal (255/sup 0/C) and temperature-programmed (25 to 600/sup 0/C) experiments. Both CO and 3H/sub 2/:CO were employed as reaction gases. With the exception of Ni/SiO/sub 2/ in 3H/sub 2/:CO, carbide formation was observed in all instances, although Fe/SiO/sub 2/ in CO was incompletely carburized under the conditions of the experiments. Decomposition of Ni/sub 3/C formed with Ni/SiO/sub 2/ was noted above 350/sup 0/C; however in the bimetallic catalyst the mixed-metal carbide formed (M/sub 2/C to M/sub 3/C) was stabilized to about 500/sup 0/C. In 3H/sub 2/:CO the rates of carbide formation and coking on 4Fe:Ni/SiO/sub 2/ are both enhanced relative to Fe/SiO/sub 2/. A surface reaction model accounting for the observed carburization behavior and in agreement with activation energy measurements is proposed. 10 figures, 3 tables.
- Research Organization:
- Northwestern Univ., Evanston, IL
- OSTI ID:
- 6813806
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 63:2; 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
36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360104* -- Metals & Alloys-- Physical Properties
ACTIVATION ENERGY
ALLOYS
CARBIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CARBURIZATION
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
ENERGY
FISCHER-TROPSCH SYNTHESIS
HARDENING
HIGH TEMPERATURE
HYDROGEN
IRON ALLOYS
NICKEL ALLOYS
NICKEL CARBIDES
NICKEL COMPOUNDS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
SILICON COMPOUNDS
SILICON OXIDES
SURFACE HARDENING
SURFACE TREATMENTS
TRANSITION ELEMENT COMPOUNDS
10 SYNTHETIC FUELS
36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360104* -- Metals & Alloys-- Physical Properties
ACTIVATION ENERGY
ALLOYS
CARBIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CARBURIZATION
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
ENERGY
FISCHER-TROPSCH SYNTHESIS
HARDENING
HIGH TEMPERATURE
HYDROGEN
IRON ALLOYS
NICKEL ALLOYS
NICKEL CARBIDES
NICKEL COMPOUNDS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
SILICON COMPOUNDS
SILICON OXIDES
SURFACE HARDENING
SURFACE TREATMENTS
TRANSITION ELEMENT COMPOUNDS