TiO_2/SBA-15光催化氧化汽油脱硫的研究

STUDY OF PHOTOCATALYTIC OXIDATIVE DESULFURIZATION OF GASOLINE WITH TiO_2/SBA-15

以介孔分子筛SBA-15为载体、钛酸四正丁酯为钛源,采用浸渍法制备TiO2/SBA-15催化剂,通过XRD、N2吸附-脱附等手段对吸附剂的结构进行分析,结果表明,所制备的TiO2/SBA-15样品仍保留着母体SBA-15的结构。以含噻吩的异辛烷溶液作为模拟汽油,以质量分数为30%的H2O2为氧化剂、TiO2/SBA-15为催化剂,在紫外灯照射下对模拟汽油进行催化氧化脱硫,通过静态实验确定了反应的最佳工艺条件,即反应温度50℃、反应时间120min、催化剂用量2g/L、H2O2与噻吩摩尔比8.5∶1,在该条件下,模拟汽油的脱硫率可达88.2%,表明TiO2/SBA-15具有很高的光催化氧化脱硫性能。

TiO_2/SBA-15 photocatalysts were synthesized by impregnation method using tetra-n-butyl titanate （TnBT） as titanium source. The properties of the catalyst were characterized by XRD and BET. The results show that TiO_2/SBA-15 catalyst keeps the structure of the support SBA-15. The pho- tocatalytic oxidative desulfurization performance of the catalyst was investigated using thiophene isooctane solution as a simulated oil and H_2O_2 as an oxidant under UV light irradiation. The process conditions of the reaction were determined by static experiment. The optimum reaction conditions are as follows：50 ℃ ,120 min, catalyst dosage of 2 g/L（feed）, the H_2O_2/thiophene molar ratio of 8.5 ： 1. Un der the conditions, the desulfurizition rate of simulated oil is up to 88.2%, indicating that TiO2/SBA-15 has a good performance of photocatalytic oxidation desulfurization.