Fig. 3: BOR performance of the Cu-Nx-y catalysts.

a, c Catalytic performance of the Cu-Nx-y catalysts for the selective oxidation of benzene to phenol. b Recycling performance of Cu-N3-33.2. d Temperature-dependent BOR performance of Cu-N3-33.2 using different solvents. Catalytic performance of Cu-N3-33.2 for (e) benzene oxidation and (f) phenol oxidation in the presence of different quenchers. Reaction conditions: 5 mg catalyst, 0.3 mL benzene, 6 mL solvent (MeCN in (a), H2O in (c)), 5 mL H2O2, 60 oC, 1 h. *Extend the reaction time to 5 h. MeCN: Acetonitrile. TBA: Tert-butanol.