模拟油品氧化脱硫及反应动力学研究

在H₂O₂/WO₃/ZrO₂氧化体系中对以甲苯为溶剂、二苯并噻吩(DBT)为模型含硫化合物的模拟油品(硫的质量分数为1540×10^-6)进行了氧化脱硫研究，考察了反应温度、反应时间、氧化剂加入量、催化剂用量对DBT转化率的影响。实验结果表明，在反应温度50℃，反应时间90min，氧化剂加入量油/H₂O₂的体积比为20∶1和催化剂用量0.02g/mL的适宜氧化脱硫条件下，96%以上的DBT氧化为容易分离脱除的二苯并噻吩砜(DBTOs)；同时研究了DBT氧化反应动力学，得知DBT氧化反应为一级反应，表观活化能E_a为55.37kJ/mol，指前因子A为3.35×10⁷min^-1。

Study on oxidative reaction and kinetics of simulated oil desulfurization

The oxidative desulfurization for a simulated oil(S content 1540×10^-6) consisting of model sulfur compounds of dibenzothiophene(DBT) and toluene solvent in a H₂O₂/WO₃/ZrO₂ oxidative system was studied. The influence of oxidation temperature， reaction time， the amount of oxidant and the dosage of catalyst on the conversion of DBT were investigated. The experimental results reveal that under an optimum oxidative desulfurization condition with the temperature of 50℃， the reaction time of 90min， the oxidant dosage of V(oil)∶V(H₂O₂)=20∶1 and the catalyst dosage of 0.02g/mL oil， more than 96% of DBT are oxidized to dibenzothiophene sulfone(DBTOs) that can be easily removed. Furthermore， the oxidation kinetics of dibenzothiophene was investigated. The oxidation of DBT can be treated as a first-order reaction， the apparent activation energy E_a is 55.37kJ/mol and the pre-exponential factor A is 3.35×10⁷min^-1.