云南褐煤结构的FTIR分析

煤的结构与转化特性密切相关,为了更好地利用云南褐煤,借助傅里叶变换红外光谱仪对云南地区典型的6种褐煤进行分析,采用仪器自带的软件对样品的红外光谱曲线进行分峰拟合,结果表明,煤中羟基、脂肪烃和含氧官能团可以分别用6个、5个和18个Gaussian峰进行拟合,根据分峰拟合的结果可以进一步得到煤的FTIR结构参数。从官能团的分析中可以看到,褐煤的氧绝大多数以多种官能团的形式存在(如酚羟基、羧基、羰基和甲氧基等),这些官能团对褐煤的热解有重要影响。对6种煤样腐植组的平均随机反射率进行测试,对6种煤样的微观结构与腐植组平均随机反射率的关联性进行探讨。

FTIR analysis of Yunnan Lignite

Coal structure is closely related to its conversion characteristics.In order to make better use of Yunnan Lignite，six kinds of typical lignite coals from Yunnan region were analyzed using Fourier transform infrared spectroscopy (FTIR).Curve-fitting analysis was employed to characterize the infrared spectrum.The results show that the hydroxyl，aliphatic and oxygen-containing structures are well fitted with six，five and eighteen Gaussians，respectively.Also，several structural parameters were obtained by further calculation based on FTIR data and curve-resolved bands.From the functional group analysis，it can be seen that most of the oxygen in lignite exist in the forms of phenolic hydroxyl，carboxyl，carbonyl and methoxyl，which have impact on its pyrolysis characteristics.Meanwhile，the mean reflectance of huminite of different coals were presented，and their relevance to the structure parameters were studied.