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Volume 30
Issue 9
10.3390/molecules30091932
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Effect of Hydrothermal Dewatering on Low-Temperature Oxidation of Lignite

by
Qiong Mo
1,2,3,4,*,
Junjie Liao
3,4,*,
Yankun Yang
3,4,
Lin Gao
3,4,
Liping Chang
3,4,
Weiren Bao
3,4,
Xianshu Dong
1,
Yuping Fan
1 and
Guichuan Ye
1,2
1
College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2
Shanxi Research Institute for Clean Energy, Tsinghua University, Taiyuan 030032, China
3
State Key Laboratory of Clean and Efficient Coal Utilization, College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
4
Key Laboratory of Coal Science and Technology, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
*
Authors to whom correspondence should be addressed.
Molecules 2025, 30(9), 1932; https://doi.org/10.3390/molecules30091932 (registering DOI)
Submission received: 19 March 2025 / Revised: 18 April 2025 / Accepted: 21 April 2025 / Published: 26 April 2025
Versions Notes

Abstract

The hydrothermal dewatering (HTD) of lignite results in noticeable variations in the low-temperature oxidation process. Consequently, this study was made on the gas release and temperature change characteristics to investigate the oxidation kinetics and mechanism of HTD coal samples. In this study, a lignite from Inner Mongolia in China was upgraded by HTD. N2 adsorption, SEM, FT-IR, and chemical titration experiments were also carried out on raw and HTD coal samples to relate the physico-chemical structure properties with low-temperature oxidation characteristics. Results show that HTD coal samples have higher low-temperature oxidation activities and lower critical ignition temperatures compared with raw coal. According to the change in activation energy by kinetic analysis, the low-temperature oxidation process in the temperature range 35–140 °C could be divided into the stage I (oxygen adsorption stage) and stage II (accelerated oxidation stage). The correlation analysis indicates that the oxygen adsorption stage is controlled by the aliphatic and surface structures, while the accelerated oxidation stage is jointly affected by the competition of physico-chemical structures. The oxygen adsorption stage promotes the progress in accelerated oxidation stage.
Keywords: lignite; hydrothermal dewatering; low-temperature oxidation; kinetic analysis; correlation analysis lignite; hydrothermal dewatering; low-temperature oxidation; kinetic analysis; correlation analysis

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MDPI and ACS Style

Mo, Q.; Liao, J.; Yang, Y.; Gao, L.; Chang, L.; Bao, W.; Dong, X.; Fan, Y.; Ye, G. Effect of Hydrothermal Dewatering on Low-Temperature Oxidation of Lignite. Molecules 2025, 30, 1932. https://doi.org/10.3390/molecules30091932

AMA Style

Mo Q, Liao J, Yang Y, Gao L, Chang L, Bao W, Dong X, Fan Y, Ye G. Effect of Hydrothermal Dewatering on Low-Temperature Oxidation of Lignite. Molecules. 2025; 30(9):1932. https://doi.org/10.3390/molecules30091932

Chicago/Turabian Style

Mo, Qiong, Junjie Liao, Yankun Yang, Lin Gao, Liping Chang, Weiren Bao, Xianshu Dong, Yuping Fan, and Guichuan Ye. 2025. "Effect of Hydrothermal Dewatering on Low-Temperature Oxidation of Lignite" Molecules 30, no. 9: 1932. https://doi.org/10.3390/molecules30091932

APA Style

Mo, Q., Liao, J., Yang, Y., Gao, L., Chang, L., Bao, W., Dong, X., Fan, Y., & Ye, G. (2025). Effect of Hydrothermal Dewatering on Low-Temperature Oxidation of Lignite. Molecules, 30(9), 1932. https://doi.org/10.3390/molecules30091932

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