Synthesis and Performance of H_3O_(40)PW_(12)/SiO_2 Solid Acid Catalysts

H3O40PW12/ SiO2 solid acid catalyst was synthesized using sol-gel. Through orthogonal experiment,four main influence factors,such as phosphotungstic acid( H3O40PW12) load,the ratio of the amount of substance of water,ethyl silicate,ethanol and ethyl orthosilicate,hydrolysis temperature,ratio of amount of substance,for the synthesis of load type solid acid catalyst H3O40PW12/ SiO2 were investigated,the results showed that ethanol and ethyl silicate was the biggest influence of amount of substance ratio on catalyst activity,then in turn of ratio of the amount of substance of ethyl silicate and water,phosphotungstic acid capacity,hydrolysis temperature. The performance of the H3O40PW12/ SiO2 catalysts were characterized by FTIR,XRD,TGA method,and the results showed that phosphotungstic acid uniform load on the SiO2,retained the original structure of heteropoly acid,the activity of catalyst was higher.