文献类型：期刊文献

英文题名：Study on the effect of inherent AAEM on char structure evolution during coal pyrolysis by in-situ Raman and TG

作者：Yu, Junqin[1];Guo, Qinghua[1];Ding, Lu[1,2];Gong, Yan[1];Yu, Guangsuo[1,3]

机构：[1]East China Univ Sci & Technol, Inst Clean Coal Technol, Shanghai 200237, Peoples R China;[2]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China;[3]Ningxia Univ, State Key Lab High Efficiency Utilizat Coal & Gre, Yinchuan 750021, Ningxia, Peoples R China

年份：2021

卷号：292

外文期刊名：FUEL

收录：;EI(收录号：20210809944413);WOS:【SCI-EXPANDED(收录号:WOS:000634747000001)】；

基金：This work was supported by National Natural Science Foundation of China (21878093), National Key R&D Program of China (2017YFB0602601), Belt & Road Young Scientist Exchange Project Supported by Fund of Shanghai Science and Technology Committee (20230742400), and Pujiang Talent Program Supported by Fund of Shanghai Science and Technology Committee (20PJ1402800).

语种：英文

外文关键词：Coal pyrolysis; In-situ Raman spectroscopy; Inherent mineral; Structure evolution

摘要：Inherent minerals, especially alkali and alkaline earth metals (AAEM), are reactive constituents that interact with organic matter during pyrolysis and have significant effects on thermal characteristics and carbon structure evolution of char. The pyrolysis of raw and leached coal samples was conducted by using thermogravimetric analyzer and in-situ Raman system to explore the effects of content and chemical form of AAEM on pyrolysis characteristics and carbon structure evolution of single char particle. The water-soluble and ion-exchangeable AAEM promoted continuous breaking/reforming of bonds between alkyl substitutional groups and aromatic ring systems, resulting in the delay of volatiles release and orderly evolution of carbon structure during pyrolysis. The effects of water-soluble AAEM was more severe, because the divalent alkaline earth metal bonds to carbon was much more stable than the monovalent alkali metal for the inherent AAEM participated in the polycondensation reaction. Besides, the ion-exchangeable AAEM inhibited the generation of cross-linked structures more effectively than water-soluble AAEM, because ion-exchangeable AAEM existed in the form of AAEMcarboxylates and delayed the thermal decomposition. Moreover, the inherent AAEM promoted the miniaturization of carbon crystal structure in the carbon matrix, forming char with disordered carbon structure.