Fischer-Tropsch slurry phase process variations. Quarterly report, April 1-June 30, 1986
In studies at 232/sup 0/C and 248/sup 0/C and 0.92 MPa, during the first 20 hours on stream, both Fischer-Tropsch synthesis activity and CO consumption increased to quasi-steady-state values. The bulk catalyst, initially ..cap alpha..-Fe, was converted to a mixture of ..cap alpha..-Fe and iron carbides, as determined by Moessbauer spectroscopy. During the first few hours, methane selectivity decreased markedly while the olefin/paraffin ratio increased. No change was observed in the C/sub 2/-C/sub 8/ product distribution with time on stream. When an industrial iron-based Fischer-Tropsch catalyst is first put on stream some 20 to 40 hours may elapse before its activity and selectivity approach steady-state conditions and during this time the phases present in the catalyst usually change markedly. The present study used a fused triply-promoted magnetite catalyst, sold for use in ammonia synthesis, which is very similar to one of the kinds of iron catalyst used industrially at SASOL in South Africa. It was completely reduced initially. Reaction was carried out in semi-continuous fashion in a well-stirred 1-litter autoclave. We were particularly concerned with studying the activity and selectivity of this catalyst as it approached steady-state behavior and determining if this correlated with the phases present in the catalyst as determined by Moessbauer spectroscopy. 20 refs., 9 figs., 1 tab.
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge (USA). Dept. of Chemical Engineering
- DOE Contract Number:
- AC22-85PC80015
- OSTI ID:
- 5511259
- Report Number(s):
- DOE/PC/80015-3; ON: DE86012294
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
Similar Records
CO + H/sub 2/ reaction over nitrogen-modified iron catalysts. Final technical report, August 1, 1982-December 31, 1985
Attrition Resistant Iron-Based Catalysts For F-T SBCRs
Related Subjects
ALKANES
CHEMICAL REACTION YIELD
ALKENES
FISCHER-TROPSCH SYNTHESIS
CATALYSTS
IRON
CATALYTIC EFFECTS
IRON CARBIDES
MAGNETITE
CARBON MONOXIDE
EXPERIMENTAL DATA
HIGH TEMPERATURE
MEDIUM PRESSURE
MOESSBAUER EFFECT
PHASE TRANSFORMATIONS
QUANTITY RATIO
SHIFT PROCESSES
SPECIFICITY
SPECTROSCOPY
TIME DEPENDENCE
CARBIDES
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
DATA
ELEMENTS
HYDROCARBONS
INFORMATION
IRON COMPOUNDS
IRON ORES
IRON OXIDES
METALS
MINERALS
NUMERICAL DATA
ORES
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YIELDS
090121* - Hydrocarbon Fuels- Chemical Synthesis- (1976-1989)