Supported cobalt oxide species with different cobalt contents, were synthesized via calcination of CoCl2.6H2O on mesoporous silica SBA-15 using the �two-solvent� method, impregnation and adsorption. The composites were characterized by N2 adsorption-desorption, SEM, TEM, XPS and ICP-MS. The mesoporosity of the support remained intact below 30 wt% cobalt loading. However, as the cobalt loading increased to 30 wt% and beyond the mesoporous structure of the SBA-15 support became distorted. The structural distortion occurred during calcination. In addition a blue coloration was observed after calcination for all composites regardless of the preparation method, suggesting that cobalt ions interact with the oxygen of the silica walls in a tetrahedral coordination. The potential of the composites to oxidize cyclohexanol was characterized by GC-MS. Catalytic activity varied in reverse proportion to the cobalt content and is attributed to better accessibility of active sites at low cobalt concentrations.

Supported cobalt oxide: Preparation and application for liquid phase oxidation of cyclohexanol

243rd National Meeting (2012)

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