文献类型：期刊文献

中文题名：自由基浓度测定方法的再验证及其在煤化学中应用

英文题名：Revalidation of measurement method of free radical concentration and its application in coal chemistry

作者：Lü, Hai-Yan[1]; Fang, Zheng-Mei[1]; Zhang, Yuan-Yuan[1]; Qian, Yu-Feng[1]; Pan, Tie-Ying[2]; Zhang, De-Xiang[1]

机构：[1] School of Resources and Environment Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] Analysis and Testing Center, East China University of Science and Technology, Shanghai, 200237, China

年份：2019

卷号：47

期号：11

起止页码：1281

外文期刊名：Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology

收录：EI(收录号：20195307948364)

语种：中文

外文关键词：Anthracite - Asphaltenes - Coal liquefaction - Free radicals

摘要：The standard curve method established by predecessors to measure the concentration of free radicals in coal was optimized to take the quadratic integral area ratio of the DPPH standard sample to the reference sample as new parameters. The results show that the relative error between the measured and theoretical values of the new parameter standard curve method is less than 5%, and the relative standard deviations of repeatability and reproducibility are less than 3%. The new parameter standard curve method was used to analyze the free radical concentration of the coal with different coal ranks and the asphaltene of Xinjiang Heishan Coal (HS). It is found that with the increase of coal rank, the free radical concentration in the coal increases gradually, from 8.531×1017/g for low-rank lignite to 3.37899×1019/g for high-rank anthracite. In the process of HS coal liquefaction, with the increase of liquefaction temperature, the free radical concentration of asphaltene decreases gradually, from 1.5793×1018/g at 290℃ to 7.410×1017/g at 450℃. The change trend of free radical is concentration in the asphaltene consistent with that of asphaltene yield. ? 2019, Science Press. All right reserved.