A frequently debated topic in cobalt based FT catalyst deactivationis the possible re-oxidation of cobalt active sites duringsynthesis and the subsequent formation FT inactive cobalt oxides.This hypothesis arises from the fact that water, the most abundantbyproduct of FTS, is an oxidizing agent and thus may cause surfaceoxidation of the cobalt nanoparticles. Water, which is present inthe form of steam under normal FT conditions, originates from sidereactions of surface oxygen and hydroxyl species that are removedfrom the surface via hydrogenation [112]. The effect of water inFTS is well documented and described from different perspectivesin recent reviews [2,113,114]
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