Cobalt doped mesoporous titania-silica with Ti/Si molar ratio of 0.5 (Co-TiO2-SiO2) was synthesized for the oxidation of diphenylmethane in acetic acid using aqueous hydrogen peroxide as oxidant for the first time. Fast hot catalyst filtration experiment proved that the catalyst acted as a heterogeneous one. Recycling of the catalyst indicates that the catalyst can be used a number of times without losing its activity to a greater extent. The effects of reaction time and reaction temperature on the performance of the catalyst were investigated. Moreover, cobalt doped mesoporous titania with a crystalline structure and cobalt doped mesoporous titania-silica with different molar ratio were also studied. It was found that Co-TiO2-SiO2 with Ti/Si molar ratio of 0.5 showed the highest activity.