WS_2/WO_3光催化选择性氧化苯甲醇制备苯甲醛

Selective photocatalytic oxidation of benzyl alcohol to benzaldehyde on WS_2/WO_3

采用H2S高温硫化WO3的方法制备了一系列WS2/WO3光催化剂,利用X射线粉末衍射仪、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/WO3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WO3和经深度硫化的WO3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.

A series of WS2/WO3 were prepared by vulcanizing WO3 using H2S under high temperature.The resulting samples were characterized by X-ray diffraction and UV-Vis spectrometer.The selective photocatalytic oxidation behaviors of benzyl alcohol to benzaldehyde on received WS2/WO3 samples were studied.The effects of the factors,such as the content of WS2 in WS2/WO3,reaction time,and solution＇s pH,on the conversion ratio of benzyl alcohol and the selectivity of forming benzaldehyde were discussed.Results indicated that,compared with WO3 and deeply vulcanized WO3,a suitable vulcanizing degree could improve the catalysts＇ selective photocatalytic oxidation behaviors of benzyl alcohol to benzaldehyde significantly.Reaction time and solution＇s pH also played vital roles on the conversion and the selectivity.