The aerobic oxidation of cyclohexane was studied at 130°C in the presence of a Co/SiO 2 catalyst, synthesized by flame-spray pyrolysis. Characterization of the material indicates that at low Co-loadings, Co II is predominantly present as tetrahedral species, whereas at higher loadings also small amounts of octahedral species can be found at the surface of the agglomerated nanoparticles. Catalytic experiments demonstrate high activity, causing a complete in situ deperoxidation of the intermediate cyclohexylhydroperoxide. Hot-separation and catalyst-recycle tests corroborate the heterogeneous nature of the catalyst.
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