Photocatalytic enhanced [HO2MMim][HSO4]?H2O2 removal of organic sulfur from coal

WANG Lan-yun; WEN Xing-lin; LIU Ze-jian; ZHANG Ya-juan; LU Xiao-ran; LIU Zhen; ZHOU Hua-jian; XU Yong-liang

doi:10.13374/j.issn2095-9389.2021.06.24.003

Volume 45 Issue 1

Jan. 2023

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Article Navigation > Chinese Journal of Engineering > 2023 > 45(1): 72-81

WANG Lan-yun, WEN Xing-lin, LIU Ze-jian, ZHANG Ya-juan, LU Xiao-ran, LIU Zhen, ZHOU Hua-jian, XU Yong-liang. Photocatalytic enhanced [HO2MMim][HSO4]?H2O2 removal of organic sulfur from coal[J]. Chinese Journal of Engineering, 2023, 45(1): 72-81. doi: 10.13374/j.issn2095-9389.2021.06.24.003

Citation:

WANG Lan-yun, WEN Xing-lin, LIU Ze-jian, ZHANG Ya-juan, LU Xiao-ran, LIU Zhen, ZHOU Hua-jian, XU Yong-liang. Photocatalytic enhanced [HO₂MMim][HSO₄]?H₂O₂ removal of organic sulfur from coal[J]. Chinese Journal of Engineering, 2023, 45(1): 72-81. doi: 10.13374/j.issn2095-9389.2021.06.24.003

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Photocatalytic enhanced [HO₂MMim][HSO₄]?H₂O₂ removal of organic sulfur from coal

doi: 10.13374/j.issn2095-9389.2021.06.24.003

WANG Lan-yun^{1, 2, 3},
WEN Xing-lin^{1, 4},
LIU Ze-jian¹,
ZHANG Ya-juan¹,
LU Xiao-ran¹,
LIU Zhen¹,
ZHOU Hua-jian¹,
XU Yong-liang^{1, 2, 3
,
,}

1.
College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
2.
Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization, Jiaozuo 454003, China
3.
State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454003, China
4.
College of Safety Science and Engineering, Nanjing Tech University, Nanjing 211806, China

More Information

Corresponding author: E-mail: xylcumt@hpu.edu.cn
Received Date: 2021-06-24
Available Online: 2021-09-09
Publish Date: 2023-01-01

Abstract

Abstract

Coal is considered one of the largest energy sources globally, but the sulfur in coal combustion seriously affects the efficient utilization of coal. Moreover, the sulfide produced by burning high sulfur coal is one of the leading causes of several diseases and environmental pollution. Incorporating photocatalytic oxidation into the extraction desulfurization system can significantly improve the efficiency of ionic liquid reactive extraction desulfurization. To further study the mechanism of desulfurization, experiment and computer simulation were used to analyze it. The experimental results show that coupling the photocatalytic reaction process and the ionic liquid extraction process can effectively remove organic sulfur in coal. The desulfurization rate of organic sulfur in the coal treated by [HO₂MMim][HSO₄]–H₂O–H₂O₂–TiO₂（mass ratio 5∶5∶10∶4）can reach 12.40%. In addition, an appropriate amount of water can improve the desulfurization rate of coal, but an excessive amount of aqueous solution can reduce the concentration of hydrogen peroxide and the organic sulfur desulfurization rate in coal. Materials Studio analysis shows that the hydroxyl radical (·OH) generated by photocatalytic activity has strong oxidability, and the area near the oxygen atom of ·OH is electronegative, which is easy to form S=O double bond with the positively charged S atom in thiophene via electrostatic attraction. In addition, the addition of ionic liquid makes the original lowest vacant orbital on the thiophene ring disappear. Moreover, it lowers the energy level difference between the HOMO and the LUMO, making the reaction easier to proceed with. Using COSMO analysis, it is found that the five-member heterocyclic structure of imidazole in [HO₂MMim][HSO₄] formed bonds with thiophene and sulfone molecules through van der Waals forces; thus, sulfide was constantly extracted into the ionic liquid phase and that adding the oxidizer can make it easier for sulfone with higher chemical potential to enter the lower chemical potential ionic solution [HO₂MMim][HSO₄] than thiophene.
- photocatalytic oxidative desulfurization,
- thiophene,
- sulfone,
- hydroxyl radical,
- Materials Studio,
- COSMO

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References(34)

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