Liquid phase oxidation of diphenylmethane to benzophenone with molecular oxygen over nano-sized Co–Mn catalyst supported on calcined Cow bone

• A new catalyst has been prepared by immobilizing Co/Mn nano-hybrid particles on calcined Cow bone.
• Co/Mn containing catalysts have been tested in the oxidation of diphenylmethane under diverse conditions.
• This work is the second detailed report of the effect of calcined bone as convenient supports for the Co/Mn catalyst.

A well-dispersed Co–Mn catalyst immobilized on calcined Cow bone was synthesized and used, for the first time for the selective synthesis of benzophenone by liquid phase oxidation of diphenylmethane under various reaction conditions. The catalyst was characterized using techniques such as UV–vis, SEM, TEM and BET. The catalyst has shown an excellent activity (87%), selectivity to diphenyl ketone (90%) and stability under solvent free conditions. To investigate the leaching of the metals from the support, results of the original and reusable catalyst was correlated and compared, and the catalytic activity of washed catalyst was also demonstrated. Based on the all catalytic results for this reaction, the new catalyst was found to be a highly active and environmentally friendly solid catalyst and has superior catalytic activity.

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