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Reduced, fused-iron catalysts, converted to cementite by direct carburization or by thermal reaction of Hagg iron carbide and iron, were tested in the Fischer-Tropsch synthesis at 7.8 and 21.4 atmospheres. Catalysts containing cementite are active in the synthesis and have similar catalytic properties to Hagg carbide. At 7.8 atmospheres, cementite and Hagg carbide are usually more active and oxidize less rapidly than reduced catalysts; however, at 21.4 atmospheres, the activity and rate of oxidation of carbided and reduced catalysts were about the same.

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