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The precursors of Fe2O3-SiO2 mixed oxides prepared through co-precipitation method were modified by microwave hydrothermal treatment for the first time.S2O82-/Fe2O3-SiO2 solid acids were formed after being impregnated by (NH4)2S2O8 solution and calcined at high temperature.The samples were characterized by XRD,TEM,N2 adsorption/desorption methods.It was found that the presence of SiO2 obviously retarded the formation and growth of Fe2O3 crystals.Catalyst with appropriate specific surface area and narrow pore size distribution was obtained.The catalytic activities of the solid acids were evaluated by esterification of acetic acid and butanol and the results were compared with those catalysts prepared at normal conditions.The results showed that catalytic activity was extensively improved by microwave hydrothermal treatment.