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The influence of thermal modification on lignite structure by FT-IR
Yue Hu
Fangjian Xue
Zhixiao Zhang
Thermal Science and Engineering 2022, 5(1), 94-101; https://doi.org/10.24294/tse.v5i1.1532
Submitted:11 Apr 2022
Accepted:02 Jun 2022
Published:12 Jun 2022
Abstract
The modification experiment of Inner Mongolia Baiyinhua lignite by hot air at 200 ℃ for 1 h was carried out. The
structural changes of Baiyinhua lignite before and after thermal modification were analyzed by infrared spectrum. The
results show that the moisture and oxygen content in lignite are greatly reduced by thermal modification, and the carbon
content and calorific value are also increased to varying degrees. In the process of thermal modification, various
oxygen-containing functional groups in lignite are reduced in different degrees due to thermal decomposition. Thermal
modification also causes substitution reaction of aromatic hydrocarbons in lignite, CH2 in aliphatic hydrocarbon
structure breaks, but hydroxyl group in lignite does not change significantly before and after thermal modification.
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