WO3光催化选择性氧化苯甲醇制备苯甲醛.pdf

第23卷第6期
化学研究
中国科技核心期刊
2012年11月
CHEMICAL RESEARC!
hxy@henu.edu.cn
WS2/WO3光催化选择性氧化汬甲醇制备苯甲醛
常志显,张凌,李德亮
(河南大学化学化工学院环境与分析科学研究所,河南开封475004)
摘要:采用H2S高温硫化WO2的方法制备了一系列WS2/WO3光催化剂,利用X射线粉末行射仪、紫外可见
光谱仪分析了产物的结构及光吸收性能,考察了WS2/WO2光催化剂光催化选择性氧化苯甲醇制备苯甲醛的性
能,讨论了WS2的含量、反应时间、反应液pH对光催化选择性氧化反应过程的影响.结果表明:与WO和经深
度硫化的WO。相比,适当的硫化能显著改善催化剂对苯甲醇的选择性氧化行为,反应时间及pH对苯甲醇的转
化率及生成苯甲醛的选择性均有重要影响.
关键词:WS2/WO3;光催化;选择性氧化;笨甲醇;苯甲醛
中图分类号:O649.4
文标志码:A
文章编号:1008-1011(2012)06-0052一04
Selective photocatalytic oxidation of benzyl alcohol to
benzaldehyde on W$2 /WO
CHANG Zhi-xian, ZHANG Ling, LI De-liang
( Institute of Enuironmental and Analytical Sciences, College of Chemistry and Chemical Engineering,
Henan University, Kaifeng 475004, Henan, China)
Abstract: A series of WS2/WO; were prepared by vulcanizing WO; using His under high tem
perature. The resulting samples were characterized by X-ray diffraction and Uv-vis
spectrometer. The selective photocatalytic oxidation behaviors of benzyl alcohol to benzalde
hyde on received WS2/WO% samples were studied. The effects of the factors, such as the con
tent of WS2 in WS2 /WO; reaction time, and solutions PH, on the conversion ratio of benzy
alcohol and the selectivity of forming benzaldehyde were discussed. Results indicated that
compared with WO; and deeply vulcanized WO%, a suitable vulcanizing degrec could improve
the catalysts selective photocatalytic oxidation behaviors of benzyl alcohol to benzaldehyde sig
nificantly. Reaction time and solutions PH also played vital roles on the conversion and the se-
lectivity
Keywords: WS /WO; photocatalysis; selective oxidation; benzyl alcohol; benzaldehyde
由醇选择性氧化制备相应的醛是有机合成领域一个非常重要的官能团转换工[.传统的氧化工艺通
常采用化学计量的氧化剂,如C1O-、Cl2、Cr(VI)、SeO2等,然而,这些氧化剂不但存在成本高、毒性大、有强
腐蚀性等问题,而且反应需要消耗大量有机溶剂,易造成环境污染.因此,发展绿色、经济、高效的由醇氧化
制备醛的技术,具有重要意义.光催化氧化技术是一种绿色环保技术,自 FUISHIMA发现TiO2在光辐射
条件下具有氧化还原性质至今,光催化技术已经在空气净化、水处理、杀菌消毒等方面被广泛研究并应用
最近,赵进才等发现,光照条件下,TiO2在三氟甲苯中能够选择性地氧化苯甲醇生成苯甲醛,反应转化率最
收稿日期:2012-07-20
基金项目;河南省教育厂科学技术研究重点项目(12A610001)
作者简介:常志显(1982一),男,实验师,硕士,研究方向为光催化.“通讯联系人.E-mail:lideliang@henu.edu.cn