10.6084/m9.figshare.8342444.v1
Xianliang Meng
Xianliang
Meng
Guifeng Zhang
Guifeng
Zhang
Ruizhi Chu
Ruizhi
Chu
Guoguang Wu
Guoguang
Wu
Mingqiang Gao
Mingqiang
Gao
Jingzhu Dai
Jingzhu
Dai
Lei Bai
Lei
Bai
Evolution mechanism of active groups and thermal effects of Chinese lignite in low-temperature oxidation
Taylor & Francis Group
2019
Active group
Evolution mechanism
Lignite
Low-temperature oxidation
Min-period of coal spontaneous combustion
Thermal effect
2019-06-28 07:26:18
Journal contribution
https://tandf.figshare.com/articles/journal_contribution/Evolution_mechanism_of_active_groups_and_thermal_effects_of_Chinese_lignite_in_low-temperature_oxidation/8342444
<p>The evolution of active groups at low temperature was examined using Chinese lignite by infrared technology and X-ray photoelectron spectroscopy (XPS). The results showed that the hydroxyl, aliphatic ether, methylene, and methyl groups played important roles in the low-temperature oxidation of lignite below 200 °C. Carbonyl and carboxyl groups were important intermediates. Thus, a multi-step evolution mechanism involving the hydroxyl, aliphatic ether groups, and alkane was reasoned to describe the low-temperature oxidation of lignite. In addition, according to the oxidation kinetics experiment and the evolution laws of the active groups, the ratios of the reaction lines were determined considering the accuracy of thermal effects. The thermal effects and the heat release intensities of each temperature interval were obtained based on the evolution mechanism and the reaction ratios. The shortest spontaneous combustion period of lignite was calculated and compared with the experimental value, which proved that the reasoned evolution mechanism of the active groups and the calculations of the thermal effects were reliable.</p>