Synthesis of Benzyl Acetate by the Composite Solid Superacid Catalyst S_2O_8~(2-)/Fe_2O_3-CoO

The novel composite solid superacid catalyst S_2O~(2-)_8/Fe_2O_3-CoO was prepared by Fe_2(SO_4)_3 and Co(NO_3)_2 as the raw material with coprecipitation-impregnation method,and it was used in the synthesis of benzyl acetate.The optimum conditions of catalyst preparation were: calcination temperature 500 ℃,impregnation concentration of ammonium peroxodisulfate 0.5 mol/L,calcination time 2.5 h.Based on the orthogonal experiment,the optimum synthetic conditions of benzyl acetate were resulted as follows: the molar ratio of benzyl alcohol to acetic acid was 1.3︰1.0,mass of the catalyst was 0.6 g(when acetic acid was 0.2 mol),the volume of the water removing reagent cyclohexane was 12 ml,and the reaction time was 2.5 h.The yield of esterification was more than 98% under above conditions.The novel type of catalyst S_2O~(2-)_8/Fe_2O_3-CoO has the features of highly activated,non-polluting and reusable.