石马洼煤显微组分结构特征的红外光谱分析

STRUCTURAL CHARACTERISTICS OF MACERAL IN SHIMAWA COAL BY FTIR ANALYSIS

通过显微组分富集物的红外光谱分段分峰拟合对比和结构参数对比,分析镜质组和惰质组结构上的差异.分段分峰拟合对比结果:两者羟基氢键的分配既有相似之处,又有区别;镜质组较惰质组含有更高比例的CH2,CHx和CO基团吸收峰,同时含有更低比例的R3CH,CC和—O—基团吸收峰;惰质组较镜质组芳环结构的取代方式更复杂.结构参数对比结果:镜质组芳香度和缩合环指数均较惰质组低;脂氢与芳氢比,镜质组较惰质组要高;氧化程度参数,镜质组较惰质组更高;芳构化参数比较,惰质组缩合比较镜质组缩合比高,而脂肪比较镜质组脂肪比低.因此可得出:石马洼煤惰质组较镜质组芳构化程度更高,脂肪链长度较短,支链较多,且氧化程度较弱.

The Structural characteristics of vitrinite and inertinite were studied using FT- IR experiments in combination with subsection peak separation method and structural parameters contrast. The results of subsection peak separation： Vitrinite and inertinite have something in common in the distribution of hydroxyl type, but different for proportion of every hydroxyl type; vitrinite is characterized by higher CH2, CHx and C==O proportions as well as lower R3CH, C==C and --O-- proportions than inertinite; the mode of distribution of aromatic hydrogen of inertinite is more than that of vitrinite, suggesting more relative complicated substitution mode of aromatic in inertinite. The results of structural parameters contrast., inertinite is characterized by higher aromaticity and ring condensation index and condensation ratio, as well as lower parameter of degree of oxidation of organic matter, n（Ha） ＂ n（Har） and aliphatic ratio than vitrinite. It indi- cates that there are higher degree of aromatization, shorter relative length of aliphatic chain, more abundance of aliphatic branch chain, and lower degree of oxidation of organic matter in iner- tinite than in vitrinite.