PREPARATION AND CHARACTERIZATION OF SUPPORTED PHOSPHOTUNGSTIC ACIDS CATALYST AND ITS CATALYTIC PERFORMANCE

One supported phosphotungstic acid catalyst was prepared,in which La modified pseudo-boehmite was used as carrier and phosphotungstic acid(H3PW12O40·nH2O,PW12) as active constituent.The prepared catalyst was characterized by the means of XRD,NH3-TPD,SEM.The supported strength of the catalyst was investigated through measuring the PW12 dissolution rate.When the loading of PW12 on the supported phosphotungstic acid catalyst was 30%,the total PW12 dissolution rate was 11.9% after being recycled 7 runs.The acid and oxidation catalytic performances of the prepared catalyst were also evaluated through the syntheses of ethyl p-hydroxybenz-oate and cyclohex-anone,whose productions reached 85.6% and 95%,respectively.The results showed that the catalyst was a kind of environmental friendly catalyst with high supported strength,good acid and oxidation catalytic activities.