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TITLE: Fischer-Tropsch Slurry Phase Process Variations. Quarterly Report, January 1, 1986-March 31, 1986. AUTHOR: C. N. Satterfield; R. Hanlon; D. K. Matsumoto. INST. AUTHOR: Massachusetts Inst. of Tech., Cambridge. SPONSOR: Department of Energy, Washington, DC. LANGUAGE: English PUB. TYPE: Technical Report PUB. COUNTRY: United States SOURCE: Department of Energy [DE], 1986, 16p. NTIS ORDER NO.: DE86009567/INW ABSTRACT: 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 deg C (run Fe22) and one at 232 deg C (run Fe27), with an intermediate period at 263 deg C. A third experiment (run Fe24) was conducted at 248 deg 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 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 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. (ERA citation 11:027079) REPORT NUMBER: DOE/PC/80015-2 CONTRACT NUMBER: AC22-85PC80015 |