Abstract: Optimal oxidation desulfurization catalyst is sorted out from 7 metal inorganic salts and oxides, gasliquidsolid threephase catalytic oxidation desulfurization of diesel is studied by using pure oxygen，optimal catalyst and different extractants. Experimental results show that sulfur content in the treated diesel can be lowered from 1441μg/g to 262μg/g with desulfurization efficiency of 81.8% when using Al2O3 as oxidizing catalyst and furfural solution containing water as desulfurization catalyst and extractant under the following condition: speed of agitator 700r/min, amount of catalyst 5%, reaction temperature 140℃, reaction time 90min and oxygen pressure 0.6MPa.

Key words: diesel, threephase catalytic, oxidation desulfurization, catalyst