COBALT FISCHER–TROPSCH CATALYST REGENERATION
Keywords:
Catalyst regeneration, Fischer–Tropsch synthesis • Kirkendall effect, cobalt nanoparticlesAbstract
Redispersion of cobalt is a key process in Fischer-Tropsch catalyst regeneration. Using model catalysts, we show that redispersion is a two-step process. Oxidation of supported metallic cobalt nanoparticles produces hollow oxide particles by the Kirkendall effect; reduction causes the disintegration of these hollow oxide shells and produces several metal particles. This mechanism is largely independent of support.
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