Abstract
Copper-doped Co3O4 with a high specific surface area has been prepared by using mesoporous silica KIT-6 as a hard template, which showed exceptional catalytic performance (99% conversion of fluorene and 99% selectivity of fluorenone) for catalytic oxidation of fluorene to fluorenone using molecular oxygen as the oxidant in the absence of a radical initiator or other cocatalysts. Characterization results of N2 adsorption–desorption, X-ray diffraction, and transmission electron microscopy of the samples revealed the ordered mesoporous structure and increased specific surface area. X-ray photoelectron spectroscopy and O2 temperature-programmed desorption results showed the increased surface cobalt, Co3+/Co2+ ratio, and oxygen species. The H2 temperature-programmed reduction also indicated that the redox ability could be improved by doped copper in Co3O4, which all facilitated the aerobic oxidation reaction.
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