哈尔乌素矿区6号煤FTIR特征

采用傅里叶变换红外光谱仪对采自哈尔乌素矿区6号煤层中的4个样品进行了红外光谱(FTIR)分析。通过对红外光谱曲线的分峰拟合,可以得到样品中官能团种类与含量的信息。结果表明:哈尔乌素矿区6号煤中苯环二取代是芳香烃的主要结构;亚甲基、甲基、次甲基含量依次降低,煤中烷基侧链较多,支链化程度高;羟基的主要存在形式是自缔合羟基氢键;在醚氧、羰基和羧基三种含氧官能团中,醚氧的含量最高。通过对样品红外结构参数和最大镜质体反射率之间相关性的探讨,发现红外结构参数的变化与煤化作用过程第一次跃变的发生存在密切关系。

FTIR characteristics of No. 6 coal from Haerwusu mine

Four coal samples from No. 6 coal seam in Haerwusu mine were analyzed using Fourier transform infrared spectroscopy(FTIR) . Information about the type and content of functional groups in the samples were obtained after curve-fitting analysis. The results showed that benzene ring-disubstituted was the primary structure of aromatic hydrocarbon. Contents of methylene, methyl and methenyl decreased successively. It indicated that the coal contained a great number of alkyl side-chains, and the degree of branching chain was high. The main existing form of hydroxide radical was self-associated hydroxyl bond. The content of ether group was the highest among the three oxygen-containing functional groups, namely carbonyl, carboxyl, and ether groups. Meanwhile, the results showed that the change of structure parameters obtained from the FTIR has the close relationship with the first coalification jump through the study of correlation between the max reflectance of vitrinite (Romax) and the structure parameters obtained from the FTIR.