Photocatalytic oxidative desulfurization of dibenzothiophene catalyzed by amorphous TiO2 in ionic liquid
Photocatalytic oxidative desulfurization of dibenzothiophene catalyzed by amorphous TiO2 in ionic liquid
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DOI：
10.1007/s11814-013-0224-3
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发表时间：
2014-01
影响因子：
2.7
通讯作者：
Wenshuai Zhu;Yehai Xu;Hua-ming Li;Bilian Dai;Hui Xu;Chao Wang;Y. Chao;Hui Liu
中科院分区：
文献类型：
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作者：
Wenshuai Zhu;Yehai Xu;Hua-ming Li;Bilian Dai;Hui Xu;Chao Wang;Y. Chao;Hui Liu
采用水解-煅烧法合成了三种类型的TiO 2。采用X射线粉末衍射（XRD）、漫反射光谱（DRS）、拉曼光谱（Raman）和X射线光电子能谱（XPS）对催化剂进行了表征。XRD和拉曼光谱表明，在100 °C下成功地得到了非晶态TiO 2。结果表明，非晶态TiO 2的脱硫效率最高。在室温（30 °C）下，研究了三种催化剂对模拟油中二苯并噻吩（DBT）、苯并噻吩（BT）、4，6-二甲基二苯并噻吩（4，6-DMDBT）和十二烷硫醇（RSH）的光催化氧化。该体系含有非晶态TiO 2、H2 O2、[Bmim] BF 4离子液体、紫外光（UV），在光催化氧化脱硫中发挥了重要作用。特别是H_2O_2与硫的摩尔比（O/S）仅为2：1，符合化学计量反应。无定形TiO_2对含DBT的模拟油的脱硫率可达96.6%，明显上级金红石型TiO_2和金红石型TiO_2的脱硫率（分别为23.6%和18.2%）。该体系可循环使用7次而光催化活性无明显下降。
Three types of TiO2 were synthesized by a hydrolysis and calcination method. The catalysts were characterized by X-ray powder diffraction (XRD), diffuse reflectance spectrum (DRS), Raman spectra, and X-ray photoelectron spectroscopy (XPS). The XRD and Raman spectra indicated that amorphous TiO2 was successfully obtained at 100 °C. The results indicated that amorphous TiO2 achieved the highest efficiency of desulfurization. The photocatalytic oxidation of dibenzothiophene (DBT), benzothiophene (BT), 4,6-dimethyldibenzothiophene (4,6-DMDBT) and dodecanethiol (RSH) in model oil was studied at room temperature (30 °C) with three catalysts. The system contained amorphous TiO2, H2O2, and [Bmim]BF4 ionic liquid, ultraviolet (UV), which played vitally important roles in the photocatalytic oxidative desulfurization. Especially, the molar ratio of H2O2 and sulfur (O/S) was only 2: 1, which corresponded to the stoichiometric reaction. The sulfur removal of DBT-containing model oil with amorphous TiO2 could reach 96.6%, which was apparently superior to a system with anatase TiO2 (23.6%) or with anatase — rutile TiO2 (18.2%). The system could be recycled seven times without a signicant decrease in photocatalytic activity.