Fischer-Tropsch slurry phase process variations. Quarterly report, January 1, 1986-March 31, 1986
Two principal experiments were conducted, in which synthesis activity, selectivity, and the bulk catalyst composition were monitored for approximately the initial 200 hours on stream. One was performed at 248/sup 0/C (run Fe22) and one at 232/sup 0/C (run Fe27), with an intermediate period at 263/sup 0/C. A third experiment (run Fe24) was conducted at 248/sup 0/C for 22 hours to verify the reproducibility of the initial activity and selectivity results of run Fe22, but no catalyst samples were taken. Four phases of iron were identified in the catalyst, namely ..cap alpha..-Fe, magnetite (Fe/sub 3/O/sub 4/), and two forms of iron carbide. The Moessbauer parameters of these phases agree well with data in the literature of the Quarterly Report for October-December 1985. Some significant observations are as follows: First, the methane selectivity was high for the earlier times on stream, (32 mole% methane) for 0 to 7 hours on stream as compared to 27 mole% for 7 to 22 and 22 to 34 hours on stream. Second, the C/sub 2/-C/sub 7/ product distributions were quite similar for the three time intervals. The value of ..cap alpha.., as determined by the slope of the distribution of the C/sub 3/-C/sub 7/ products, increased only slightly over time, from a value of 0.62 from 0 to 7 hours to a value of 0.64 from 7 to 22 and 22 to 34 hours. Finally, the C/sub 8/-C/sub 14/ fraction increased significantly with time, reflecting the effect of the accumulation and eventual saturation of heavier hydrocarbon products in the reactor. 9 figs. 7
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge (USA)
- DOE Contract Number:
- AC22-85PC80015
- OSTI ID:
- 5965816
- Report Number(s):
- DOE/PC/80015-2; ON: DE86009567
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CATALYSTS
CHEMICAL COMPOSITION
FISCHER-TROPSCH SYNTHESIS
YIELDS
IRON
CATALYTIC EFFECTS
IRON CARBIDES
MAGNETITE
METHANE
CHEMICAL REACTION YIELD
ALKANES
ALKENES
EXPERIMENTAL DATA
HIGH TEMPERATURE
MEDIUM PRESSURE
QUANTITY RATIO
RESEARCH PROGRAMS
SLURRIES
SPECIFICITY
TIME DEPENDENCE
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
DATA
DISPERSIONS
ELEMENTS
HYDROCARBONS
INFORMATION
IRON COMPOUNDS
IRON ORES
IRON OXIDES
METALS
MINERALS
MIXTURES
NUMERICAL DATA
ORES
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
SUSPENSIONS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
090121* - Hydrocarbon Fuels- Chemical Synthesis- (1976-1989)