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Technology development for iron Fischer-Tropsch catalysts. Quarterly technical progress report for period ending December 1993 [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1993.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
18 pages : digital, PDF file
Additional Creators
University of Kentucky, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Conversion data as a function of time of synthesis for the two catalysts are shown in Figures 2 and 3. In general the precipitated catalyst is more active than the iron carbide catalyst with syn-gas conversions starting at 80% as compared to 50% for the latter; however, both catalysts deactivated with increasing reaction time. A comparison of the C₂, C₃ and C₄ olefin selectivities at 26% CO conversion (precipitated catalyst-336 hr of synthesis, iron carbide catalyst-122 hr of synthesis) are shown in Figure 4. Surprisingly the precipitated catalyst had a higher olefin content than the iron carbide catalyst. It has been reported that a similar iron carbide catalyst has higher selectivity for the production of olefins than a ``conventionally prepared`` Fe/Co catalyst. The discrepancy may be due in part to comparing the olefin selectivity of the two catalysts at different conversions. Their ``conventional catalyst`` had a C₂−C₄ olefin content of 37% at 72% conversion compared to 86% olefin at 55% conversion for the iron carbide catalyst. In general the olefin selectivity of a catalyst is highest at low conversions. The iron carbide catalyst of this study produces more hydrocarbons than the precipitated catalyst; furthermore, it produces a higher fraction of C₃ + (86% vs. 84%) and C₅+ (67% vs. 61%) hydrocarbons (Figure 5). Correspondingly, the iron carbide catalyst produces less methane and ethane than the precipitated catalyst (Figure 6). These hydrocarbon and C₅+ selectivities are similar to those reported earlier.
Report Numbers
E 1.99:doe/pc/90056--t14
doe/pc/90056--t14
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
12/31/1993.
"doe/pc/90056--t14"
"DE94014338"
"AA2520000"
Davis, B.H.; Eklund, P.; O`Brien, R.J.; Xu, Liguang; Bi, Xiangxin.
Type of Report and Period Covered Note
Quarterly; 10/01/1993 - 12/31/1993
Funding Information
AC22-91PC90056
View MARC record | catkey: 13838892