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低阶煤表面含氧官能团的X射线光电子能谱研究

发表时间:2009-05-15  浏览量:1446  下载量:639
全部作者: 郑仲,曾凡桂,王传格
作者单位: 太原理工大学矿业工程学院
摘 要: 为了解低阶煤表面含氧官能团(oxygen-containing functional groups, OFG)的特征和煤表面的氧化变化,对采自3个矿区的13个低变质煤样进行了工业分析、元素分析和X射线光电子能谱(X-ray photoelectron spectroscopy, XPS)实验,并运用统计解析法研究了煤结构特征,运用分峰拟合和相关分析法处理了XPS实验数据。研究结果显示:Krevelen经验公式计算芳碳率fa不适用于低阶煤,低阶煤O/C原子比随着Cdaf含量的增加而降低;表面含氧官能团的主要赋存形式是醚羟基(C—O),羰醛基(C=O)和羧基(COO—),其含量较少,表面各含氧官能团含量和总体O/C原子比之间并没有显著的相关关系,与表面O/C原子比之间呈现一定的相关关系;煤表面氧化过程为:CC—OC=OCOO气体。
关 键 词: 地球化学;煤化学;含氧官能团;X射线光电子能谱;低阶煤
Title: Research on oxygen-containing functional groups of low rank coal surface
Author: ZHENG Zhong, ZENG Fangui, WANG Chuange
Organization: College of Mining Technology, Taiyuan University of Technology
Abstract: To study the characteristics of oxygen-containing functional groups (OFG) of low rank coal surface and study coal surface oxidation process, proximate analysis, element analysis and XPS were carried out on 13 coal samples from 3 mines. Statistical analysis was applied to study the coal structure characteristics, while peak deconvolution and correlation analysis methods were used to deal with the XPS spectrum data. The result showed that Krevelen empirical formula was not suitable for the calculation of aromatic-carbon ratio fa of low rank coal, and the O/C decreased with the Cdaf content increase. It also showed that the dominant form of the OFG was C—O, and C=O and COO— were less. The OFG content had no direct relation with the bulk O/C atom ratio, but had certain correlation with the surface O/C atom ratio. The results indicated that the oxidation process of coal surface should follow this path: CC—OC=OCOOgas.
Key words: geochemistry;coal chemistry; oxygen-containing functional groups; X-ray photoelectron spectroscopy; low rank coal
发表期数: 2009年5月第9期
引用格式: 郑仲,曾凡桂,王传格. 低阶煤表面含氧官能团的X射线光电子能谱研究[J]. 中国科技论文在线精品论文,2009,2(9):912-919.
 
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