TS-TiO_2光催化氧化苯乙烯反应性能研究

Study of styrene photocatalytic oxidation over TS-TiO_2

在常温、常压条件下 ,以 TS-Ti O2 为催化剂 ,分子氧为氧源 ,1 2 5W紫外线高压汞灯为光源 ,考察了反应条件对苯乙烯光催化氧化反应性能的影响 .结果表明 :光照和催化剂是必不可少的 ,且反应主产物是苯甲醛 ;在该实验条件下 ,催化剂的焙烧温度、催化剂的用量均存在一最佳值 ;光强越强、溶液 p H值越小 ,催化活性越好 ;具有光敏性的溶剂有利于提高光催化反应的反应性能 .

The oxidation of styrene has been carried out under the mild conditions of ambient temperature and pressure, using TS TiO 2 as catalyst and molecular oxygen as oxidant, using 125 W high pressure mercury lamp as light resource. The effects of reaction conditions have been investigated. Results show that irradiation and catalyst are essential, the calcination temperature of the catalyst and the catalyst amount have an optional range. The higher the light intensity and the lower the pH value of the solution, the better the reactivity of styrene . The photosensitized solvent can improve the reaction reactivity. The catalyst has lower reactivity, but has higher selectivity, which is higher than 90 percent.