2种不同变质程度煤表面化学结构红外光谱分析

摘要

The functional groups characteristics of two different degrees of metamorphic coal were quantitatively studied using FTIR spectrometry and curve-fitting technique.Some structure parameters have been applied to evaluate the differences in chemical structures of coal.The results show that the content of organic matter in low rank coal is relatively small.In the process of transformation from low to high-rank coal,the maturity of organic matter increases,so that the skeleton of the coal becomes soft.The side chains of alkyl become longer and branched chain becomes lesser.With the increase of coal rank,the content of oxygen-containing functional groups decreases.Meanwhile,the degree of the aromatic ring condensation becomes higher.It is feasible to quantitatively study the chemical structure of coal by Fourier transform infrared spectroscopy and curve-fitting technique.%利用傅立叶红外光谱法(FTIR)和分峰技术,定量研究了长焰煤和无烟煤这2种不同变质程度煤的官能团特征,对比了2种煤的化学结构参数的差异,结果表明,低变质程度煤中有机质相对较少,在向中高变质煤转化的过程中,有机质的成熟度增大,使得煤的骨架变得松软,脂肪链支链减少,长度变短.低变质程度煤的含氧官能团多于高变质程度煤,随着变质程度的提高,煤中芳香环的聚合程度增强.利用傅里叶红外光谱以及分峰技术定量研究煤的化学结构是可行的.