Abstract
The role of activation treatments on catalyst activity was studied for a precipitated Fe 2 O 3 -CuO-K 2 O catalyst. In particular, it was shown that reduction of the catalyst to α-Fe yielded a catalyst that was inactive in F-T synthesis. The inactivity after severe H 2 reduction was traced to S migration to the surface of α-Fe. This S migration did not occur when the catalyst was reduced only to Fe 3 O 4 , wherein the S may remain in the bulk of the catalyst and therefore not affect catalyst activity. Catalyst activity was related to the formation of iron carbide during catalyst activation, hence CO activation yielded a catalyst with greater initial activity than H 2 or syngas activation.
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