Low Temperature Oxidation Effects on Lignite Molecular Structure

Abstract:

The paper studied the change of the coal characteristics based on the influence of lignite naturally oxidated in air. The original lignite and lignite naturally oxidated under different time were analyzed by the FTIR technology. The reason that metamorphism of lignite was vulnerable by oxygen was analyzed from the side of coal molecular structure. It indicates that lignite of a low rank coal easily oxidated is mainly because lignite has more active groups in coal molecular such as methyl, methylene, hydroxyl, aromatic ether, oxygen button and ether key. In lignite molecular, side chains of aromatic ring structure unit is firstly oxidized. The bridge button or side chains of coal molecular structure unit are easily oxidized at the same time with the structure of the bridge between units fracturing oxidation. Number of aromatic hydrocarbons remains stable after oxidation. General trend of cycloparafin hydrocarbon as well as aliphatic hydrocarbon are gradually reduced over the oxidized time.

• Periodical: Advanced Materials Research (Volumes 550-553)
• Pages: 2797-2800
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.550-553.2797
• Online since: July 2012
• Authors: Wu Jie Ge, Qun Shao, Hui Xu, Ya Li Wan
• Keywords: FT-IR, Lignite, Low Temperature Oxidation, Molecular Structure

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