| H3PW12O40/?SBA-15 solid acid catalyst was prepared by loading SBA-15 molecular sieve with phosphotungstic acid by ultrasound-assisted impregnation. The specific surface area measurement, pore size distribution, and Fourier transform infrared spectroscopy (FTIR)of solid acid catalyst were characterized. The catalytic performance of H3PW12O40/SBA-15 catalyst for the epoxidation of waste frying oil methyl ester was investigated. The results showed that the prepared SBA-15 molecular sieve had a large specific surface area and a highly ordered pore, and the SBA-15 molecular sieve loaded with phosphotungstic acid maintained the Keggin structure and didnt destroy the pore structure of the SBA-15 molecular sieve. The catalytic performance decreased with the increase of phosphotungstic acid loading amount in the range of 20%-60%. Under the conditions of phosphotungstic acid loading amount 20%, reaction time 10 h and reaction temperature 30?℃, the iodine value of the product could reach 2172 gI/100 g and the epoxy value was 5.5 mol/100 g. |
