Abstract: Copper tungstate was prepared by direct precipitation method at room temperature. The sample was treated with high temperature calcination and activation with hydrogen peroxide in order to improve the oxidative desulfurization activity. Then the oxidative desulfurization of dibenzothiophene (DBT) from model oil was carried out using the activated CuWO4 as catalyst, hydrogen peroxide as the oxidant, and imidazolium fluoroborate ionic liquid as extracting agent．The reaction conditions，including temperature, amount of catalyst and oxidant, types of extractant and sulfides were also studied．The results indicate the optimized desulfurization conditions of 0.4 mL of hydrogen peroxide, 0.02 g of catalyst, imidazole tetrafluoroborate as the extractant at 70 ℃ for 60 min, and the desulfurization rate can reach 93%. In addition, the desulfurization rate remains above 82% when the catalyst was reused for five times.

Key words: CuWO4, Ionic liquids, Dibenzothiophene, Desulfurization, Oxidant

摘要： 通过直接沉淀法制备了钨酸铜, 采用高温煅烧和双氧水活化提高钨酸铜的氧化脱硫活性。以活化后的钨酸铜为催化剂、 过氧化氢为氧化剂、 咪唑氟硼酸盐离子液体为萃取剂, 氧化脱除模拟油中的二苯并噻吩( D B T) 。研究了反应时间、 反应温度、 催化剂质量、 过氧化氢体积、 萃取剂类型、 硫化物类型等因素对脱硫率的影响, 同时考察了催化剂/萃取剂脱硫体系循环使用性能。脱硫实验的最佳条件为: 反应温度为7 0℃、 H2O2体积为0. 4mL、 催化剂质量为0. 0 2g、 以咪唑氟硼酸盐为萃取剂、 反应时间为6 0m i n。在最佳条件下脱硫率可以达到9 3%。催化剂重复使用5次, 脱硫率依然比较高, 为8 2%。

关键词: 钨酸铜, 离子液体, 二苯并噻吩, 脱硫, 氧化剂