Oxidative Desulfurization of Gasoline Catalyzed by Organic-inorganic Heteropoly Acid Ionic Liquids Under Ultrasound

A series of Organic. inorganic heteropoly acid ionic liquids was synthesized and used for catalyzing oxidative desulfurization of simulated gasoline under ultrasound. With the help of ultrasonic wave, the reaction time was largely reduced, and the desulfurization efficiency was also raised. The results showed that Zr-0.25 [BMIM] HPW12O40 exhibits the best catalytic activity. The effects of ultrasonic power, ultrasonic/clearance time, the amount of catalyst, reaction temperature, reaction time, and the amount of H2O2 on the desulfurization rate were fully investigated. The selected optimal conditions were as follows: n(Cat.) = 0.008 mmol, V(H2O2)= 40 mu L, V(simulated oil) = 10 mL, V(acetonitrile) = 1 mL, reaction temperature 25 degrees C, reaction time 10 min, the ultrasonic power 300 W, the ultrasonic time 2 s, and the ultrasonic off-time 1. 5 s. Under the optimal conditions, the sulfur removal of DBT could reach 97.8%. The solid catalyst Zr-0.25 [BMIM] HPW12O40 could be directly separated out after the reaction, and could be reused after the vacuum drying. The results showed that Zr-0.25 [BMIM] HPW12 O-40 also exhibited good recyclability. After 5 recycles, the desulfurization rate still could reach 81.9%. By using Zr-0.25 [BMIM] HPW12O40 as catalyst, the reaction activity decreased in the order of DBT > 4, 6-DMDBT > ethyl thioether > phenyl thioether > n-butyl mercaptan> methyl phenyl thioether> BT> thiophene.