Preparation and Catalytic Activity of Solid Super-acid S_2O_8~(2-)/TiO_2-WO_3

A novel solid super-acid S2O82-/TiO2-WO3 was prepared by solgel method and was characterized by XRD and IR.Its catalytic activity was investigated by acting as a catalyst to synthesize acetic ether.The preparation conditions have also been investigated,that is,the mass ratio of(NH4)10W12O41·xH2O used in the compound is 5.0 %,the calcination temperature is 500 ℃.The results show the carrier TiO2 of the catalyst is fine and its crystalline lattice incomplete,which results high specific surface area.The catalyst shows high catalytic activity and stability in the esterification with higher sulfur content and stronger acidity than SO42-/TiO2 by impregnation method.When the amount of catalyst is 6.0 %(based on mass of acetic acid),molar ratio of absolute alcohol to glacial acetic acid is1.48∶1,the conversion of acetic acid was 74.1 % after 2.0 h.Meanwhile,the activity of catalyst used repeatedly declined slowly under no deactivation,which demonstrates that the solid super-acid S2O82-/TiO2-WO3 has high stability property.