钛硅分子筛光催化氧化二苯并噻吩的研究

Photocatalytic oxidization of dibenzothiophene by titanium-silicium molecular sieve

采用液固相同晶取代法和微波法合成了Ti-β,Ti-NaY和Ti-MCM-41a,并通过红外和紫外-可见漫射对样品进行表征。以二苯并噻吩为研究对象,考察了钛硅分子筛的光催化活性。结果发现,钛硅分子筛具有很好的光催化性能,光催化氧化脱硫的活性顺序为:Ti-MCM-41a>TS-1>Ti-NaY>Ti-β。10 mL模型油为基准的最佳反应条件为:钛质量分数,Ti-β为0.37%,Ti-NaY为3.7%和Ti-MCM-41a为5.325%;催化剂用量,Ti-NaY为0.05 g,Ti-β为0.05g,Ti-MCM-41a为0.04 g,H2O2用量(氧硫摩尔比):Ti-NaY为5.33∶1,Ti-β和Ti-MCM-41为12.39∶1。

Ti-β, Ti-NaY, and Ti-MCM-41a were synthesized by liquid-solid isomorphous substitution method and microwave method. The samples were characterized by fourier transformed infrared and UV-Vis diffuse reflection. Photocatalytic activity of titanium-silicium molecular sieve was studied with dibenzothiophene （DBT） as object. The results show that photocatalytic activities of these samples are good for catalytic oxidization of DBT. The order of activity is Ti-MCM-41 a 〉 TS-1 〉 Ti-NaY 〉 Ti-β. The optimum reaction condition based on 10 mL model oil is that the mass fraction of Ti in molecular sieve is Ti-β0.37% , Ti-NaY 3.7% , and Ti-MCM-41 a 5. 325%. The mass of catalyst is Ti-NaY 0.05 g,Ti-β 0. 05 g and Ti-MCM-41a 0.04 g, amount of H2O2 （ mole ratio of O/S） is Ti-NaY 5.33 ： 1 ,Ti-β and Ti-MCM-41a 12.39 ： 1 ,respectively.