Structural evaluation of Xiaolongtan lignite by direct characterization and pyrolytic analysis
Structural evaluation of Xiaolongtan lignite by direct characterization and pyrolytic analysis
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DOI：
10.1016/j.fuproc.2015.12.034
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发表时间：
2016-04
影响因子：
7.5
通讯作者：
Yu-Gao Wang;Xianyong Wei;Sheng-Kang Wang;Zhan-Ku Li;Peng Li;Fang‐Jing Liu;Z. Zong
中科院分区：
文献类型：
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作者：
Yu-Gao Wang;Xianyong Wei;Sheng-Kang Wang;Zhan-Ku Li;Peng Li;Fang‐Jing Liu;Z. Zong
采用固体13 C核磁共振谱仪、X射线光电子能谱仪、傅里叶变换红外光谱仪等直接表征仪器和热重分析仪、居里点裂解-气相色谱/质谱联用仪等热解仪器对西南地区小龙潭褐煤（XL）中的有机质进行了分析。XL中的有机碳主要由脂肪族碳和芳香族碳组成。具体地，亚甲基在脂肪族碳中占主导地位，并且亚甲基链中的平均碳数为约100。5.每个芳族簇含有2个环，并且每个芳环平均具有4个取代基。XL中含有丰富的含氧官能团（OFM），包括Cal-O、Car-O、> C双键O和-COOH，其中Cal-O和Car-O占主导地位，从而使Cal-O和Car-O键断裂，促进了XL中有机物的挥发。酚类化合物是XL闪速热解挥发物中含量最高的组分，可能是有机质中Car-O裂解的结果。热解分析表明，选择性地裂解这些键将大大有助于将XL转化为液体燃料或精细化学品。
Organic matter in Xiaolongtan lignite (XL) from Southwest China was analyzed by direct characterization instruments (including solid-state13C nuclear magnetic resonance spectrometer, X-ray photoelectron spectrometer, and Fourier transform infrared spectrometer) and pyrolytic tools (including thermogravimetric analyzer and Curie-point pyrolyzer-gas chromatograph/mass spectrometer). Organic carbons in XL mainly consist of aliphatic and aromatic carbons. Specifically, methylene dominates in the aliphatic carbons and average carbon number in the methylene chains is ca. 5. Each aromatic cluster contains 2 rings and each aromatic ring has 4 substituents on average. XL is rich in oxygen-functional moieties (OFMs), including Cal–O, Car–O, > Cdouble bondO, and –COOH, among which Cal–O and Car–O are predominant and thereby cleaving Cal–O and Car–O bonds facilitates the devolatilization of organic matter in XL. Phenols are the richest components in the volatiles from flash pyrolysis of XL, which may result from the cleavage of Car–O in the organic matter. The pyrolytic analyses imply that selectively cracking these bonds would greatly facilitate converting XL into liquid fuels or fine chemicals.