酸性离子液体和Na2WO4·2H2O催化

以酸性离子液体和Na₂WO₄·2H₂O组成的体系为催化剂，过氧化氢为氧化剂，将催化柴油中的噻吩硫氧化为砜类物质，并通过NMP将其萃取出来，同时考察了反应温度、反应时间和催化剂用量等因素对氧化脱硫反应的影响，得出最佳反应条件为：3 mL油样（含硫200 μg·g^_-1），1 g离子液体，0.021 g 钨酸钠（Na₂WO₄·2H₂O）， 0.7 mL过氧化氢，反应温度323 K，反应时间3 h，萃取剂与柴油体积比为1∶1，此时样品中的硫可降低到23 μg·g^-1。反应结束后，可以通过简单的倾倒将油样和催化剂分离，催化剂重复使用5次，催化活性基本不变。

Catalytic oxidative desulfurization of diesel with Na2WO4·2H2O and acidic ionic liquid

With acidic ionic liquid and Na₂WO₄·2H₂O as catalysts, and hydrogen peroxide as an oxidant, the deep desulfurization of diesel was conducted by oxidation of thiophenic sulfur into sulfone that was extracted by NMP. Effects of temperature, reaction time, and amount of catalyst on the reaction of oxidative desulfurization were also investigated. Diesel with lower sulfur content (23 μg·g^-1) was obtained under the optimal reaction conditions as follows: 3 mL oil sample with sulfur concentration of 200 μg·g^-1, 1 g ionic liquid, 0.021 g sodium tungstate (Na₂WO₄·2H₂O), 0.7 mL hydrogen peroxide, reaction temperature of 323 K, reaction time of 3 h and V(NMP)∶V(diesel)=1∶1. After the reaction, diesel oil and catalyst were separated by decantation. The catalyst could be recycled for five times without obvious change in catalytic activity.