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Amorphous aluminum phosphate (AlPO 4 )-supported cobalt catalysts, with and without Ru promotion, were evaluated to study CO hydrogenation activity during Fischer−Tropsch synthesis (FTS). The Ru-promoted catalyst (RuCo/AlPO 4 ) exhibited higher CO conversion and C 8 + selectivity than that of the unpromoted catalyst (Co/AlPO 4 ) and Co/Al 2 O 3 catalyst. Interestingly, filamentous carbon was formed, even at the mild FTS reaction conditions ( T = 220−240 °C and P = 2.0 MPa), on Co/AlPO 4, and it eventually accelerated catalyst deactivation. The presence of an Ru promoter restricted the formation of filamentous carbon and enhanced catalyst stability.
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Bae et al. (2009) studied this question.
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