文献类型：期刊文献

英文题名：Catalytic effects of inherent AAEM on char gasification: A mechanism study using in-situ Raman

作者：Yu, Junqin[1];Xia, Weidong[1];Areeprasertc, Chinnathan[2];Ding, Lu[1,3];Umeki, Kentaro[4];Yu, Guangsuo[1,5]

机构：[1]East China Univ Sci & Technol, Inst Clean Coal Technol, Shanghai 200237, Peoples R China;[2]Kasetsart Univ, Fac Engn, Dept Mech Engn, 50 Ngam Wong Wan Rd, Bangkok 10900, Thailand;[3]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China;[4]Lulea Univ Technol, Div Energy Sci, S-97187 Lulea, Sweden;[5]Ningxia Univ, State Key Lab High Efficiency Utilizat Coal & Gre, Yinchuan 750021, Ningxia, Peoples R China

年份：2022

卷号：238

外文期刊名：ENERGY

收录：;EI(收录号：20213810923267);WOS:【SCI-EXPANDED(收录号:WOS:000701789000013)】；

基金：This work was supported by the National Natural Science Foundation of China (21878093) , the National Key R&D Program of China (2017YFB0602601) , Belt & Road Young Scientist Exchange Project Supported by Fund of Shanghai Science and Technology Committee (20230742400) , Pujiang Talent Program Supported by Fund of Shanghai Science and Technology Committee (20PJ1402800) , and the Fundamental Research Funds for the Cen-tral Universities (JKB012011013) .

语种：英文

外文关键词：Gasification; Operando Raman; In-situ characterization; Catalytic mechanism

摘要：Despite a small proportion of mineral in coal, inherent alkali and alkaline earth metals (AAEM) catalytically affected thermal conversion of coal. The gasification of raw and leached coal char was investigated by using an operando microscopic Raman spectroscopy to explore the effect of content and chemical form of the inherent AAEM on morphology and carbon structure evolution of a single particle during in-situ char gasification. The removal of water-soluble and ion-exchangeable AAEM reduced the R-0.5 of SF, NM and YN char by 53.31%, 49.09% and 35.02%, respectively. As a result, the shrinkage of leached coal char progressed slower than that of the raw coal char. Besides, both water-soluble and ion-exchangeable AAEM accelerated char gasification because of an inhibition of the orderly evolution of carbon structure. Higher gasification temperature weakened the catalytic performance of ion-exchangeable AAEM. With the consumption of carbon, carbon microcrystalline structure of the residual char tended to be ordered, which led to a decrease in active free carbon sites for gasification reaction. Kinetic analysis indicated both water-soluble and ion-exchangeable AAEM reduced the activation energy of SF, NM and YN char by 20.97, 20.82 and 9.38 kJ.mol(-1), respectively, and the effect of ion-exchangeable AAEM was more significant. (C) 2021 Elsevier Ltd. All rights reserved.