Technology development for iron Fischer-Tropsch catalysts. Final technical report, December 18, 1990--December 17, 1993 Page: 4 of 1,082
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Preparation of Iron Oxide Catalyst
The preparation of the iron oxide catalyst was to define the impact of the
following variables on the final catalyst:
1. final pH-of the precipitation mixture,
2. concentration of iron and base,
3. base used ,
4. temperature of precipitation,
5. time taken to effect the precipitation,
6. length of time the precipitate is aged,
7. filtration rate,
8. method of washing,
9. fraction of the reagents contained in the hydrous precipitate, and
10. drying and calcination conditions.
The criteria for a definition of the impact that the above variables had upon the
catalyst preparation was the surface area of the material following drying at 110*C or
calcining in the temperature range 200-400*C. It was established that the
concentration of iron and base, at least in the range of 0.1 to 1.5 M iron and 1 to 15 M
base, did not have a large impact upon the surface area. In the pH range of about 5-
10, there was not a major impact of pH on the surface area; aging at either lower or
higher pH values increased the solubility of the iron species and led to lower surface
area materials. For ammonium hydroxide as base, the final surface area decreased
with an increase of the temperature at which precipitation was effected. For rates
ranging from very rapid (dumping the iron and base solutions into a contained) to
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Davis, B.H. Technology development for iron Fischer-Tropsch catalysts. Final technical report, December 18, 1990--December 17, 1993, report, February 1, 1996; United States. (https://digital.library.unt.edu/ark:/67531/metadc672817/m1/4/: accessed April 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.