Preparation of Nano Solid Superacid SO_4~(2-)/M_xO_y and Catalyzed Synthesis of n-Butyl Acetate

The nanometer-sized SO_4~(2-)/ZrO_2 and SO_4~(2-)/Fe_2O_3 solid superacids have been prepared and their esterification activity for n-butanol with acetic acid has been examined.The activity order is SO_4~(2-)/ZrO_2SO_4~(2-)/Fe_2O_3.The influence factors of the reaction have been investigated.The results showed that the optimum conditions including the molar ratio of absolute n-butanol to acetic acid of 1.24∶1;the weight of the catalyst(0.6 g,if the weight of acetic acid was 0.087 mol);the reaction time(6 h);the yield of n-butyl acetate(99.62%).The structure of catalyst has been studied by XRD,IR,Hammett indicator and TEM methods.The catalytic activity and strength of acid(-12.70H_0≤-11.99) were measured.