| |
| The catalysts of phosphomolybdic acid loaded on silica and modified with La3+, Ce3+ and Pr3+ respectively were prepared by the sol-gel method and characterized by FT-IR, XRD and pore structure parameters analysis. The oxidative desulfurization of model fuel oil catalyzed by the catalysts have been studied under the mild condition. Results show that the catalysts kept integrity Keggin structures, the active centers of phosphomolybdic acid were greatly scattered and the pore size and specific surface area were increased obviously after modification. The catalytic oxidative reactions of dibenzothiophene (DBT) were accorded with the apparent first-order kinetics, and the apparent activation energies of DBT catalyzed by La-Mo/SiO2, Ce-Mo/SiO2 and Pr-Mo/SiO2 were 30.29 kJ/mol, 33.41 kJ/mol and 35.15 kJ/mol, respectively. |
|
| Keywords:phosphomolybdic acid; modification; rare earth elements; oxidative desulfurization, kinetic study |
|
