文献类型：期刊文献

英文题名：Non-thermal effect of microwave on organic sulfur removal from coal by microwave with peroxyacetic acid

作者：Tang, Longfei[1,2,3];Chen, Xueli[1];Tao, Xiuxiang[2]

机构：[1]East China Univ Sci & Technol, Inst Clean Coal Technol, Shanghai 200237, Peoples R China;[2]China Univ Min & Technol, Sch Chem Engn & Technol, Xuzhou 221116, Jiangsu, Peoples R China;[3]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China

年份：2023

卷号：338

外文期刊名：FUEL

收录：;EI(收录号：20230113329951);WOS:【SCI-EXPANDED(收录号:WOS:000923171300001)】；

基金：This work was supported by the National Natural Science Foundation of China (No. 22108081), the Shanghai "Super Postdoctoral Fellow" incentive program (No. 2020118) and the Social Development Science and Technology Tackling Project of 2020 "Scientific and Innovative Action Plan of Shanghai" (No. 20dz1203300). The authors are indebted to staff at the Beijing Synchrotron Radiation Facility (BSRF) medium energy beam-line station for their generous assistance. Measurements at BSRF were supported by the public user program.

语种：英文

外文关键词：Coal; Desulfurization; Microwave; Non-thermal microwave effect; Organic sulfur

摘要：This work investigated the non-thermal microwave effect during organic sulfur removal from coal by microwave irradiation combined with oxidation assistants. XANES was used to analyze the change of sulfur forms in the desulfurization process of high organic sulfur coal under microwave heating and conventional heating condi-tions. The effects of microwave fields on the molecular properties, bond strength and reaction kinetic of organic sulfur-containing groups were studied by quantum chemical calculation. Results showed that the desulfurization rate with microwave heating improved by 26% at the same temperature compared with conventional heating. The XANES analysis indicated that microwave radiation promoted the transformation of low-valence sulfur into high-valence sulfur, which resulted in the sulfur in the treated coal mainly existing as heterocyclic sulfur and oxidized sulfur. For the theoretical calculation, it is observed that the nucleophilic reaction activity of sulfur -containing groups could be improved and the strength of C-S bands could be reduced under the extra elec-tric fields due to the non-thermal microwave effect. Besides, the reaction activation energy was reduced and the reaction rate was increased under the same extra electric fields, promoting the formation of oxidized sulfur in coal. Therefore, there was a competitive relationship between sulfur-containing bond dissociation and group oxidation under the action of microwave non-thermal effect, which provided a reference for coal desulfurization research.