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Colloidal synthesis of nanocrystals (NC) followed by their attachment to a support and activation is a promising route to prepare model catalysts for research on structure-performance relationships. Here, we investigated the suitability of this method to prepare well-defined Co/TiO 2 and Co/SiO 2 catalysts for the Fischer-Tropsch (FT) synthesis with high control over the cobalt particle size. To this end, Co-NC of 3, 6, 9, and 12 nm with narrow size distributions were synthesized and attached uniformly on either TiO 2 or SiO 2 supports with comparable morphology and Co loadings of 2-10 wt %. After activation in H 2 , the FT activity of the TiO 2 -supported 6 and 12 nm Co-NC was similar to that of a Co/TiO 2 catalyst prepared by impregnation, showing that full activation was achieved and relevant catalysts had been obtained; however, 3 nm Co-NC on TiO 2 were less active than anticipated. Analysis after FT revealed that all Co-NC on TiO 2 as well as 3 nm Co-NC on SiO 2 had grown to ∼13 nm, while the sizes of the 6 and 9 nm Co-NC on SiO 2 had remained stable. It was found that the 3 nm Co-NC on TiO 2 already grew to 10 nm during activation in H 2 . Furthermore, substantial amounts of Co (up to 60%) migrated from the Co-NC to the support during activation on TiO 2 against only 15% on SiO 2 . We showed that the stronger interaction between cobalt and TiO 2 leads to enhanced catalyst restructuring as compared to SiO 2 . These findings demonstrate the potential of the NC-based method to produce relevant model catalysts to investigate phenomena that could not be studied using conventionally synthesized catalysts.

Preparation of Cobalt Nanocrystals Supported on Metal Oxides To Study Particle Growth in Fischer–Tropsch Catalysts