The effect of iron additive incorporation mode on the Fischer–Tropsch Synthesis performance of alumina-supported cobalt catalysts
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Co-Fe bimetallic catalysts have attracted increasing attention in the field of Fischer–Tropsch synthesis (FTS). In this study, cobalt was supplied in the form of Co 3 O 4 nanoparticles, and three different methods of iron (Fe) incorporation were employed: (1) Fe modification of the Al 2 O 3 support prior to Co 3 O 4 loading (Co/Fe-Al 2 O 3 ), (2) co-loading of Fe and Co 3 O 4 (CoFe/Al 2 O 3 ), and (3) Fe modification of Co 3 O 4 prior to loading (Co-Fe/Al 2 O 3 ). These model catalysts were used to investigate the interactions between Co, Fe and the support and their impact on the catalytic activity and product selectivity of FTS. The results showed that the addition of Fe promotes cobalt reduction, modifies H 2 and CO adsorption properties and regulates catalytic performance. Compared with Co/Al 2 O 3 , Co/Fe-Al 2 O 3 exhibited the best reducibility and significantly reduced CH 4 selectivity from 19.2–11.2%. However, its CO adsorption weakened, decreasing CO conversion from 25.3–21.4%. Co-Fe/Al 2 O 3 showed enhanced H 2 and CO adsorption, increasing CO conversion by 18.9%. These findings demonstrate that the location of Fe affects the metal-support interaction, reducibility and adsorption activation abilities of the Co catalyst, ultimately altering FTS activity and selectivity.
