Benzoic acid could be efficiently prepared from aerobic oxidation of toluene using manganese dioxide (MnO 2 ) and N-hydroxyphthalimide (NHPI) as catalysts. The conditions of oxidation, including temperature, amount of catalyst, dioxygen pressure and reaction time, were studied in details. Thus 94.4% conversion of toluene and 98.4% selectivity of benzoic acid could be obtained at 110°C under 0.3 MPa for 3 h in the presence of 10 mol% NHPI and 4 mol% MnO 2 .
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