Abstract: MoO₂/g-C₃N₄ catalysts with different MoO₂ content were prepared by direct calcination of mixtures of g-C₃N₄ and MoO₂. The structure and properties of the catalysts were characterized by XRD,FTIR,SEM,N₂ adsorption-desorption. The desulfurization performance of the reaction system was investigated by using MoO₂/g-C₃N₄ as the catalyst,H₂O₂ as oxidant,and ionic liquid as extractant. The effects of calcination temperature,content of MoO₂,amount of hydrogen peroxide,dosage of catalyst,reaction temperature,amount of ionic liquid and the type of sulfur-containing compounds in oil,on the desulfurization efficiency were investigated. The result showed that under the optimal reaction conditions of V(H₂O₂)=0.2mL,m(catalyst)=0.03g,V(ILs)=1.0mL,reaction temperature 70℃ and reaction time 60min,the desulfurization efficiency of 24%-MoO₂/g-C₃N₄ catalyst was 94.8% and the catalyst could be recycled 5 times without significant loss of activity. Furthermore,the catalytic oxidation reaction mechanism of MoO₂/g-C₃N₄ in ionic liquid was studied in detail.

Key words: catalyst, environment, oxidation, molybdenum trioxide, carbon nitride, dibenzothiophene

摘要： 采用高温煅烧MoO₂和g-C₃N₄混合物制备了不同MoO₂含量的MoO₂/g-C₃N₄催化剂。采用X射线粉末衍射（XRD）、傅里叶红外光谱（FTIR）、扫描电镜（SEM）和N₂吸附脱附对催化剂的结构和性能进行了表征。以MoO₂/g-C₃N₄作为催化剂，H₂O₂为氧化剂，离子液体为萃取剂研究了反应体系的氧化脱硫性能。这项研究中考察了不同煅烧温度下制得的催化剂、负载量、氧化剂使用量、催化剂加入量、反应温度、萃取剂使用量、反应时间、硫化物类型等不同反应参数对脱硫率的影响。结果表明，在H₂O₂的使用量为0.2mL，MoO₂/g-C₃N₄加入量为0.03g，1-乙基-3-甲基咪唑硫酸乙酯离子液体1.0mL，反应温度为70℃，反应时间60min的最佳工艺条件下，24%-MoO₂/g-C₃N₄催化剂脱硫率可以达到94.8%，催化剂循环使用5次后活性没有明显下降。此外，研究了MoO₂/g-C₃N₄在离子液体中的催化氧化反应机理。

关键词: 催化剂, 环境, 氧化, 氧化钼, 氮化碳, 二苯并噻吩