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Sintering of supported cobalt nanoparticles is one of the main deactivation mechanisms in the Fischer–Tropsch synthesis. In this study, crystallite growth was studied with an alumina-supported catalyst in real time and as a function of process conditions using a novel in situ magnetometer. It could be shown that sintering with this catalyst occurred via a combination of high CO and high water partial pressures. It is proposed that particle growth proceeds via cobalt subcarbonyl migration over the hydroxylated support surface.

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