An inspection of available literature shows that although the FTS does occur in the presence of active surface carbon and various hydrocarbon products there may be a gradual transformation into inactive more stable forms of carbon in extended runs. This carbon could be possibly detrimental for catalyst activity. In support of this postulate, we showed in our work that a deactivating polymeric carbon build-up may occur on Co/Pt/Al2O3 FTS catalysts, taken from a 100- barrel/day slurry bubble column reactor operated at commercially relevant FTS conditions. Using a new approach with EFTEM and HSLEIS we showed that this polymeric carbon is located both on the support and on cobalt.
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