Synthesis, characterization and application of nano-sized Co2CrO4 spinel catalyst for selective oxidation of sulfides to sulfoxides

The nano-sized Co2CrO4 spinel was produced for the first time by thermal decomposition of Cr–Co gel prepared by sol–gel method. It was shown that well-crystallized spinel structure is formed after calcination at 450 °C. The usual characterizations were performed and the results showed the particle size of the prepared spinel is 9 nm. Moreover, the prepared nano-sized Co2CrO4 spinel was applied in a simple, efficient and recyclable method for selective oxidation of sulfides to their corresponding sulfoxides with aqueous hydrogen peroxide in tert-butanol.

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► Synthesis of novel nano-sized Co2CrO4 spinel by sol–gel method (low-temperature-spinel).
► The full characterizations of the catalyst.
► Application of the nano catalyst in the selective oxidation of sulfides to sulfoxides.