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为研究气体解吸、常温氧化和高温氧化3种不同处置方式下CO生成煤表面化学结构的变化特征,采用傅里叶变换红外FTIR)光谱仪,对3种不同变质程度煤样在氮气环境解吸72 h、25℃氧化72 h和100℃氧化10 h 3种处置方式前后固体颗粒试样的表面微化学结构及官能团进行检测,结果表明:在非氧化CO产生过程未发生化学反应,常温空气条件下低变质煤样和空气中的氧发生反应,脂肪烃含量降低,部分含氧官能团增加,1 379~1 373 cm~(-1)甲基谱峰变化较大,高变质无烟煤变化不明显,在100℃空气条件下低变质褐煤反应最明显,无烟煤反应程度低,主要为脂肪烃含量降低,苯类结构吸收峰稍有增强,研究凸显出了煤的表面活性基团在未进入燃烧阶段前氧化过程中的中介特征。
In order to study the chemical composition of the surface of CO produced by CO desorption, room temperature oxidation and high temperature oxidation, the chemical composition of the surface of coal was studied by Fourier transform infrared (FTIR) spectroscopy. The desorption of three different metamorphic coal samples under nitrogen atmosphere for 72 h , 25 ℃ oxidation 72 h and 100 ℃ oxidation 10 h before and after treatment of three kinds of solid particles on the surface of the micro-chemical structure and functional groups were detected, the results show that: in the non-oxidized CO production process does not occur chemical reaction under normal temperature air conditions low The metamorphic coal samples react with oxygen in the air, the content of aliphatic hydrocarbons decreases and some oxygen-containing functional groups increase. The peak of methyl group at 1 379-1 373 cm -1 changes greatly, but the change of highly metamorphic anthracite is insignificant. At 100 ℃, the reaction of low-metamorphic lignite is the most obvious in air, and the reaction of anthracite is low, mainly due to the decrease of aliphatic hydrocarbon content and the slight increase of the absorption peak of benzene structure. The study highlights that the surface active groups of coal oxidize before entering the combustion stage In the intermediary features.