Comparison of Huolinhe lignite structural features by using 13C NMR & FTIR techniques

doi:10.11949/j.issn.0438-1157.20170330

Abstract

Abstract:

The chemical structures of Huolinhe lignite (HLHM) were characterized with ¹³C NMR & FTIR techniques. According to ¹³C NMR analysis, HLHM consisted of 34.32% aliphatic carbons, 61.25% aromatic carbons and 4.43% carbonyl carbons. Each aromatic cluster contained 1-2 rings on average and the number of substituents on each aromatic ring was 3-4. The length of average methylene chain was 1.4 and the branched degree of aliphatic chain was 25.47%, showing the aliphatic carbons mainly consisted in the form of short chain. Several structural parameters were obtained by calculation based on FTIR data and curve-resolved band. Structural parameters (average methylene chain length, substituted degree of aromatic ring, aliphatic chain branched degree) obtained by FTIR analysis were consistent with the results of ¹³C NMR analysis. Although aromatic carbon rate existed certain deviation between FTIR and ¹³C NMR results, FTIR analysis can still reflect the carbon skeleton structure characteristics of coal in some ways.

Key words: Huolinhe lignite, ¹³C NMR, FTIR, comparison analysis

摘要：

采用¹³C NMR及FTIR对霍林河褐煤的化学结构特性进行深入分析，通过¹³C NMR计算得到霍林河褐煤包含34.32%的脂肪族碳、61.25%的芳香族碳以及4.43%的羰基碳。平均每个芳环团簇包含1~2个芳香环，每个芳香环中平均碳原子取代数为3~4。平均亚甲基碳链数为1.4，烷链支化度为25.47%，说明脂肪族多以短链分支形式存在。通过对霍林河褐煤红外光谱进行分峰拟合，计算得到煤的FTIR结构参数（平均亚甲基碳链数、芳香环取代度、烷链支化度）与¹³C NMR计算结果相吻合。虽然芳碳率（f_ar-F=55.37%）与¹³C NMR计算结果存在一定的偏差，但是FTIR很大程度上仍然可以反映煤的碳骨架结构特性。

关键词: 霍林河褐煤, ¹³C NMR, FTIR, 对比分析

CLC Number:

TQ523

XU Fang, LIU Hui, WANG Qing, LIU Ying. Comparison of Huolinhe lignite structural features by using ¹³C NMR & FTIR techniques[J]. CIESC Journal, 2017, 68(11): 4272-4278.

徐芳, 刘辉, 王擎, 刘营. 霍林河褐煤化学结构特性的¹³C NMR与FTIR对比分析[J]. 化工学报, 2017, 68(11): 4272-4278.

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Comparison of Huolinhe lignite structural features by using ¹³C NMR & FTIR techniques

霍林河褐煤化学结构特性的¹³C NMR与FTIR对比分析

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