Huang Zhian, Tian Ye, Gao Yukun, Shao Zhenlu, Zhang Yinghua, Liu Xiaohan
State Key Laboratory of High-Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Ministry of Education, Beijing 100083, China.
Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology, Ministry of Education, Xuzhou 221116, China.
ACS Omega. 2020 Jul 7;5(28):17287-17303. doi: 10.1021/acsomega.0c01513. eCollection 2020 Jul 21.
Both the macroscopic reaction and microscopic characterization of water-immersed coal have been studied. The methods of thermogravimetric analysis via Fourier transform infrared spectroscopy (TG-FTIR) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) are used. The apparent activation energy of water-immersed coal was significantly lower than that of raw coal. For the same coal sample, the production of CO in water-immersed coal is significantly higher than that in raw coal. The analysis shows that after water immersion, the content of hydroxyl and aromatic hydrocarbons in the coal increases significantly and the temperature at which fat-based and oxygen-containing functional groups participate in the reaction decreases. This indicates that the functional groups are unstable after water immersion and react violently. When the immersion time is 60 days, the activation energy is the lowest, the production of CO reaches its maximum, and the variation of each functional group is most obvious.
对水浸煤的宏观反应和微观特征进行了研究。采用了傅里叶变换红外光谱热重分析（TG-FTIR）和漫反射红外傅里叶变换光谱（DRIFTS）方法。水浸煤的表观活化能明显低于原煤。对于相同的煤样，水浸煤中CO的生成量明显高于原煤。分析表明，水浸后煤中羟基和芳烃含量显著增加，脂肪基和含氧官能团参与反应的温度降低。这表明水浸后官能团不稳定，反应剧烈。当浸泡时间为60天时，活化能最低，CO生成量达到最大值，各官能团的变化最为明显。
