昭通褐煤及其萃取和热溶残渣的13C NMR和XPS研究
首发时间:2015-11-30
摘要:固体核磁共振(13C NMR)和X射线光电子能谱(XPS)作为直接表征手段,能够在不破坏样品结构的条件下完成碳骨架结构和杂原子(O、N和S)形态分布的分析。本研究对昭通褐煤(ZL)进行逐级常温超声萃取和分级变温热溶,得到萃取残渣(ER)和热溶残渣(TDR),并利用固体13C NMR和XPS分析了ZL、ER和TDR的碳骨架结构和含氧官能团类型。结果表明,ZL和ER中脂肪碳含量较高,TDR以芳香碳为主;经萃取和热溶后,TDR中有机质的缩合程度与ZL和ER相比明显提高;ZL、ER和TDR中的有机氧主要以C?O的形式存在。
关键词: 褐煤 13C NMR XPS 碳骨架结构 含氧官能团
For information in English, please click here
13C NMR and XPS investigation of Zhaotong lignite and its extraction and thermal dissolution residues
Abstract:As the direct characterization techniques without destroying the structures of samples, solid-state 13C nuclear magnetic resonance (NMR) and X-ray photoelectron spectrometry (XPS) can provide important information on carbon skeleton structures and heteroatom (oxygen, nitrogen, and sulfur) forms.In this study, sequential extraction and thermal dissolution of Zhaotong lignite (ZL) were conducted to obtain extraction residue (ER) and thermal dissolution residue (TDR). Carbon skeleton structures and oxygen-functional groups in ZL, ER, and TDR were analyzed by 13C NMR and XPS tools, respectively. The results show that aliphatic carbons are abundant in ZL and ER, while the TDR is dominated by aromatic carbons. Through extraction and thermal dissolution, the condensation degree of organic species in the TDR is obviously higher than that in ZL and ER. In addition, organic oxygen species in ZL, ER, and TDR are mainly present in the forms of C-O groups.
Keywords: lignite 13C NMR XPS carbon skeleton structure oxygen-functional group
论文图表:
引用
No.4665140111370914****
同行评议
勘误表
昭通褐煤及其萃取和热溶残渣的13C NMR和XPS研究
评论
全部评论0/1000