CuWO4/C复合物的制备和其在模拟油氧化脱硫中的应用

用混合煅烧法制备了CuWO₄/C复合物,并采用XRD、SEM、和BET等技术对其结构进行表征。以CuWO₄/C复合物为催化剂、过氧化氢为氧化剂、1-乙基-3-甲基咪唑硫酸乙酯盐离子液体为萃取剂氧化脱除模拟油中的二苯并噻吩(DBT)。考察了反应温度、双氧水加入量、萃取剂加入量等因素对脱硫效果的影响。结果表明,在相同的实验条件下,相比于CuWO₄,CuWO₄/C复合物具有更高的脱硫率。在模拟油为5.0 mL、催化剂加入量为0.02 g、H₂O₂加入量0.2 mL、萃取剂加入量1.0 mL、反应温度70℃、反应时间180 min的最佳实验条件下,DBT转化率可达到98.2%,催化剂循环使用四次活性没有明显降低。

Study of the preparation of CuWO4/C composite and it's application in oxidative desulfurization of model oil

The CuWO₄/C composite was synthesized via a simple mixing-calcination method and characterized by various techniques including X-ray diffraction, scanning electron microscopy, Brunauer-Emmett-Teller and so on. The removal of dibenzothiophene (DBT) in model oil was studied by using CuWO₄/C as catalysts, hydrogen peroxide as oxidant, 1-ethyl-3-methylimidazole ethyl sulfate (EMIES) ionic liquid (IL) as the extractant. Results indicated that the CuWO₄/C composite exhibited a much higher desulfurization ratio than pure CuWO₄ under the same experimental conditions. The influence of reaction temperature, amount of hydrogen peroxide, amount of extractant on the desulfurization efficiency were investigated. The results indicated that under the optimal reaction conditions of 5 mL model oil, 0.02 g of CuWO₄/C, 0.2 mL of hydrogen peroxide, 1.0 mL of extractant, reaction temperature 70℃ and reaction time 180 min, the desulfurization efficiency of CuWO₄/C was 98.2%. The catalyst could be recycled 4 times without a significant decrease in activity.