Technology development for iron Fischer-Tropsch catalysis. Quarterly technical progress report, October--December, 1994 Page: 4 of 17
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maximize the activity of iron based precipitated Fischer-Tropsch catalysts, we are
currently attempting to optimize the activation procedure. Although we are able to
achieve high activity using CO pretreatment, the catalysts tend to deactivate suddenly
and rapidly after 500 hr of synthesis. Kolbel reports high CO conversion comparable
to our results at a lower gas flow (2.4 vs. 3.4 nL/hr-g(Fe)); however, he achieved
greater stability with conversions reported to be 90% after 1400 hr.3 One possibility
for Kolbel's higher stability could be due to the activation procedure. Herein are
reported the initial results of a study to optimize the catalyst composition and the
operating conditions for the iron based slurry phase Fischer-Tropsch synthesis when
synthesis gas activation is utilized.
EXPERIMENTAL
The catalyst used in this study was prepared by continuous precipitation of
ferric oxyhydroxide from 1.17 M Fe(NO)3-9H20 by adding concentrated NH40H to
produce a suspension with a pH of ~9.5. The catalyst was promoted with silicon by
adding hydrolyzed Si(OC2H)4 to the ferric nitrate solution. Copper promotion was
accomplished by impregnating the dried catalyst with aqueous Cu(NO)22.5H20 by
the incipient wetness technique. Promotion with potassium was accomplished by
adding the appropriate amount of potassium t-butoxide to the catalyst oil slurry in the
Fischer-Tropsch reactor. The nominal catalyst compositions for the catalysts used in
this study, given as atomic % relative to iron metal, are 100Fe/4.4Si/0.71 K and
100Fe/4.4SV0.71 K/2.6Cu.
Catalysts were tested in a one liter autoclave operated as a continuous stirred
tank reactor. The catalysts were suspended in a hydrocarbon oil supplied by Ethyl
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Technology development for iron Fischer-Tropsch catalysis. Quarterly technical progress report, October--December, 1994, report, December 31, 1994; Lexington, Kentucky. (https://digital.library.unt.edu/ark:/67531/metadc674711/m1/4/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.