低阶煤分子碳结构的分析与研究
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摘要
为了促进低阶煤资源高效合理的利用,以神东低阶煤为研究对象,采用多种测试研究方法,对低阶煤分子的碳结构进行表征和分析。研究结果表明,该低阶煤样品分子碳骨架中的芳香结构主要以苯环和萘环为主,还含有其他芳香环结构,且芳香层侧链数目远大于桥和环的数目,芳香桥碳与周碳比为0.199。通过进一步对XRD图谱拟合分析发现,在煤分子的碳骨架中,芳香结构在平面上的延展度和空间上的堆垛度较低,煤中芳香结构体系小,芳核的缩聚程度较低;XPS拟合分峰图谱从分子结构的层面揭示了该样品表面C原子的4种存在方式,C原子除了以C-C和C-H的形式存在外,主要以C=O、C-O和O=C-O等形式存在于这些含氧官能团中,且含氧官能团偏多。
In order to promote the efficient and reasonable utilization of low rank coal resources,the authors took Shendong low rank coal as research object,and characterized and analyzed carbon structure of the object by using various test methods.The results showed that the aromatic structure in molecular carbon skeleton of the sample mainly included benzene ring,naphthalene ring,and also contained other aromatic ring structures,the number of aromatic layer side chains was much larger than that of bridges and rings,and the ratio of bridge carbon and carbon was 0.199 in aromatic structure.According to analysis XRD profile fitting,the results showed that the extension of aromatic structure on the plane and the stacking degree on the space were low in the carbon skeleton of coal molecules,the aromatic structure system in coal was small,and the condensation degree of aromatic nuclei was quit low,by fitting the XPS peak,four modes of C atoms existed in the surface molecular structure of the sample including C-C and C-H forms,C atoms mainly existed in the form of C=O,C-O,and O=C-O in the oxygen-containing functional groups which had the most oxygen-containing functional groups.
In order to promote the efficient and reasonable utilization of low rank coal resources,the authors took Shendong low rank coal as research object,and characterized and analyzed carbon structure of the object by using various test methods.The results showed that the aromatic structure in molecular carbon skeleton of the sample mainly included benzene ring,naphthalene ring,and also contained other aromatic ring structures,the number of aromatic layer side chains was much larger than that of bridges and rings,and the ratio of bridge carbon and carbon was 0.199 in aromatic structure.According to analysis XRD profile fitting,the results showed that the extension of aromatic structure on the plane and the stacking degree on the space were low in the carbon skeleton of coal molecules,the aromatic structure system in coal was small,and the condensation degree of aromatic nuclei was quit low,by fitting the XPS peak,four modes of C atoms existed in the surface molecular structure of the sample including C-C and C-H forms,C atoms mainly existed in the form of C=O,C-O,and O=C-O in the oxygen-containing functional groups which had the most oxygen-containing functional groups.
引文
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[2]屈进州,陶秀祥,唐龙飞等.神东低阶煤浮选前后表面性质的表征研究[J].中国煤炭,2014(2)
[3]徐鑫,熊志军.国内外煤炭提质技术应用现状[J].中国煤炭,2013(12)
[4]虞育杰,姜红丽,龚徳鸿等.低阶煤分级利用技术研究综述[J].广东电力,2018(3)
[5]李永改,陈建中,沈丽娟.低阶煤反浮选试验研究[J].中国煤炭,2016(8)
[6]赵鹏,史士东.用XPS研究胜利褐煤中有机氧的赋存形态[J].煤炭科学技术,2004(7)
[7]魏帅,严国超,张志强等.晋城无烟煤的分子结构特征分析[J].煤炭学报,2018(2)
[8]桂夏辉,邢耀文,王英伟等.煤泥浮选过程强化之四---易浮难选煤泥浮选过程特征篇[J].选煤技术,2017(4)
[9]王晓华,葛岭梅,周安宁等.流化床空气氧化过程中煤化学结构变化的研究[J].煤炭加工与综合利用,2000(1)
[10]倪中海,刘毅,周长春等.煤液化基础研究进展[J].煤炭转化,2002(2)
[11]麻志浩,阳虹,张玉贵等.不同煤级煤(13)CNMR结构特性及演化特征[J].煤炭转化,2015(4)
[12]罗陨飞.煤的大分子结构研究---煤中惰质组结构及煤中氧的赋存形态[D].煤炭科学研究总院,2002
[13]李鹏鹏.杜儿坪2号煤结构模型构建及其分子模拟[D].太原理工大学,2014
[14]彭立才,韩德馨,邵文斌等.柴达木盆地北缘侏罗系烃源岩干酪根~(13)C核磁共振研究[J].石油学报,2002(2)
[15]相建华,曾凡桂,梁虎珍等.不同变质程度煤的碳结构特征及其演化机制[J].煤炭学报,2016(6)
[16]张玉波.中低煤化作用阶级煤化作用机理的~(13)C-NMR研究[D].太原理工大学,2006
[17]相建华,曾凡桂,李彬等.成庄无烟煤大分子结构模型及其分子模拟[J].燃料化学学报,2013(4)
[18]Mark S.Solum.13 C NMR Analysis of Soot Produced from Model Compounds and a Coal[J].Energy&Fuels,2001(4)
[19]张双全.煤化学[M].徐州:中国矿业大学出版社,2009
[20]姜永泼.屯兰2号镜煤大分子聚集态结构模型的构建及分子模拟[D].太原理工大学,2018
[21]司加康.马兰8号煤大分子结构模型构建及分子模拟[D].太原理工大学,2014