煤的拉曼光谱特征

发布时间：2018-03-19 05:33

本文选题：煤　切入点：微晶结构　出处：《煤炭学报》2016年05期 　论文类型：期刊论文

【摘要】：煤具有石墨微晶的特性,对煤微晶结构及其演化的研究在煤岩学、煤化学和煤地质学等领域均有极其重要的意义。通过对不同变质变形程度的煤进行拉曼光谱测试,发现煤微晶结构及其演化与拉曼光谱特征之间存在密切关系:一级模区分出5个峰,分别为D_1~D_4峰及G峰谱带,芳构化及芳环缩合作用的增强均会导致峰位差(G-D_1)的急剧增大和半高宽比(G/D_1)的急剧减小,拼叠作用则使得峰位差开始减小,半高宽比降幅减缓;二级模可区分出3个峰,分别为2D_1峰、D_1+G峰与2G峰谱带,低煤阶煤3峰难以区分,高煤阶煤3峰独立出现。这些特征表明煤中的石墨微晶经历了从小到大、从无序到有序的一个演化过程。同一煤层峰位差和半高宽比的差异反映出软煤分层的煤化程度略高于硬煤。可见拉曼光谱是一种研究煤结构的有效手段。
[Abstract]:The study of coal microcrystalline structure and evolution is of great significance in the fields of coal petrology, coal chemistry and coal geology. It is found that there is a close relationship between the microstructure and evolution of coal microcrystals and Raman spectrum characteristics: the first order mode distinguishes five peaks, which are D _ s _ 1 / D _ 4 and G _ (peak) bands, respectively. The enhancement of aromatization and aromatic ring condensation will result in the sharp increase of peak difference (G-D1) and the sharp decrease of half-aspect ratio G / D _ 1), while the stacking effect will make the peak difference begin to decrease and the half aspect ratio decrease slowly, and the two-stage mode can distinguish three peaks. It is found that the peak of low rank coal is difficult to distinguish and the peak of high rank coal appears independently. These characteristics indicate that the graphite microcrystals in coal have experienced from small to large. The difference of peak position difference and ratio of half height to width of the same coal seam shows that the coalification degree of soft coal stratification is slightly higher than that of hard coal. Visible Raman spectroscopy is an effective means to study coal structure.
【作者单位】：河南理工大学能源科学与工程学院;中原经济区煤层(页岩)气河南省协同创新中心;晋城水利勘测设计院;
【基金】：国家自然科学基金资助项目(41472127,41472129) 2014年度山西省煤基重点科技攻关资助项目(MQ2014-01)
【分类号】：O657.37;TQ533

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