二氧化硅负载磷钨酸季铵盐催化氧化二苯并噻吩的研究  

Oxidation of dibenzothiophene catalyzed by silica supported quaternary ammonium phosphotungstate catalyst

作　　者：刘丽君[1] 刘翠娥[1] 贾连洋[1] 崔庆新[1] 龚树文[1] 

机构地区：[1]聊城大学化学化工学院,山东省化学储能与新型电池技术重点实验室,山东聊城252059

出　　处：《化学研究与应用》2013年第10期1412-1416,共5页Chemical Research and Application

基　　金：973计划前期研究专项基金项目(2010CB234601)资助;山东省优秀中青年科学家科研奖励基金项目(BS2010CL011)资助;山东省高校优秀科研创新团队计划项目资助

摘　　要：以正硅酸乙酯为硅源,利用溶胶-凝胶法制备了二氧化硅负载磷钨酸季铵盐催化剂,对催化剂进行了FTIR和XRD分析。以双氧水(30%)为氧化剂,初步评价了催化剂在催化氧化二苯并噻吩反应中的催化性能,并探讨了催化剂负载量、催化剂用量、反应温度以及反应时间等反应条件对二苯并噻吩的催化氧化反应的影响。结果表明,负载后,磷钨酸季铵盐仍具有典型的Keggin结构;含有负载磷钨酸季铵盐催化剂、30%双氧水的正己烷/乙酸的双液相氧化体系可高活性的将噻吩类含硫化合物催化氧化为砜,不同噻吩类化合物的氧化遵循4,6-二甲基二苯并噻吩>二苯并噻吩>苯并噻吩>噻吩的顺序;负载催化剂可回收多次使用。A series of silica supported quaternary ammonium phosphotungstate catalysts with different loadings were prepared by sol gel method and characterized with XRD and IR methods. The catalytic activity of these catalysts in oxidation reaction of dibenzothio phenes was also evaluated, and here H2O2 was taking as oxidant. Experiments results indicated that the Keggin structure was still re tained after quaternary ammonium phosphotungstate supported on silica. Dibenzothiophenes were oxidized effectively with H2 02 in the presence of these catalysts in the n-hexane/AcOH biphasie system to give their corresponding sulfones as products. The oxida tive reactivity of the sulfur compounds was in the order of 4,6-dimethyl dibenzothiophene〉dibenzothiophene〉benzothiophene〉thio phene. The catalyst could be reused several times.

关 键 词：磷钨酸季铵盐 催化氧化 双氧水 

分 类 号：O643.36[理学—物理化学]