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Deep desulfurization and denitrogenation of diesel fuel over Ir/Pr-N-CQDs-TiO2 under ultraviolet radiation
Separation and Purification Technology ( IF 8.6 ) Pub Date : 2021-05-03 , DOI: 10.1016/j.seppur.2021.118861
Lei Wang , Ning Zuo , Meng Sun , Yingying Ma , Nchare Mominou , Weijie Jiang , Shuzhen Li , Chunyu Jing

Designing an efficient and environmentally-friendly catalyst for desulfurization and denitrogenation of diesel to substitute for widely used catalysts is essential. We have prepared Ir/Pr-N-CQDs-TiO2 by doping N, CQDs, Ir, and Pr in TiO2. The results suggested that turnover frequencies were much higher than those of the others, which indicated that the prepared catalyst had an excellent activity of desulfurization and denitrogenation under ultraviolet radiation. Turnover frequencies of benzothiophene, dibenzothiophene, and 4, 6-dimethyldibenzothiophene were 62.8, 78.4, and 92.4, and turnover frequencies of quinolone, indole, and carbazole were 64.5, 88.4, and 86.5, respectively. The ratios of desulfurization and denitrogenation reached 99.8% and 95.5%. The results of PL, UV–vis, and EPR showed the doping of N, CQDs, Ir, and Pr could extend the range of photo-absorption and improve the hole-electron separation of TiO2. This might be because of the N, CQDs, Ir, and Pr increasing oxygen vacancies and defects on the catalytic surface, forming lower gap energy and rapidly transferring and reserving electrons under ultraviolet radiation. Also, the photocatalytic mechanism of Ir/Pr-N-CQDs-TiO2 was proposed in the present work.



中文翻译:

Ir / Pr-N-CQDs-TiO 2在紫外辐射下对柴油进行深度脱硫和脱氮

设计一种高效,环保的柴油脱硫和脱氮催化剂以替代广泛使用的催化剂至关重要。我们通过在TiO 2中掺杂N,CQDs,Ir和Pr制备了Ir / Pr-N-CQDs- TiO 2。结果表明,周转频率远高于其他频率,表明所制备的催化剂在紫外辐射下具有优良的脱硫和脱氮活性。苯并噻吩,二苯并噻吩和4、6-二甲基二苯并噻吩的发生频率分别为62.8、78.4和92.4,喹诺酮,吲哚和咔唑的周转频率分别为64.5、88.4和86.5。脱硫脱氮率分别达到99.8%和95.5%。PL,UV-vis和EPR的结果表明,N,CQDs,Ir和Pr的掺杂可以扩展光吸收范围并改善TiO 2的空穴电子分离。这可能是由于N,CQD,Ir和Pr增加了氧空位和催化表面的缺陷,形成了较低的能隙,并在紫外线辐射下迅速转移和保留了电子。此外,目前的工作中还提出了Ir / Pr-N-CQDs-TiO 2的光催化机理。

更新日期:2021-05-08
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