摘要
喹啉不溶物(QI)是煤沥青组成中一类大分子碳质颗粒的统称,对煤沥青的性质和应用有着重要的影响。为深入研究煤沥青中喹啉不溶物的基本性质,本研究以喹啉为溶剂,分别对三种典型沥青(中温沥青、氧化改性沥青和热缩聚沥青)进行溶剂萃取分离处理,得到三种喹啉不溶物(QI-M、QI-O和QI-N)。利用元素分析仪、热重分析仪、粒度分析仪和偏光显微镜对三种QI的基础物性进行了表征。通过SEM、XRD、Raman光谱结合分峰拟合的方法对三种喹啉不溶物基沥青炭的微观结构进行了研究。结果表明:QI-M是一种亚微米级球形碳质颗粒,其粒度均匀性最佳;QI-N尺寸较大,是一种粒度分布较为均匀、尺寸约为16μm的球状炭。三种QI的热解行为迥异,QI-O、QI-N在250~500℃内存在热解反应和缩聚反应的协同发生,而QI-M只有热解反应的发生。三种喹啉不溶物基沥青炭QI-M-C、QI-O-C和QI-N-C中,石墨晶体(I G/I All)含量依次为10.61%、6.84%和12.43%;无定形碳含量(I D3/I All)依次为9.18%、11.09%和6.06%;晶粒尺寸(L c)依次为1.62 nm、1.35 nm和1.85 nm。QI-N具有较好的高温可石墨化性,而QI-O的高温可石墨化性欠佳。
Quinoline insoluble is a kind of macromolecular carbon particle component in the coal tar pitch,which has important influence on the properties and application of coal tar pitch.In order to a detailed analysis of quinoline insoluble,three kinds of quimoline insolubles(QI-M,QI-O and QI-N)which obtained from varies coal tar pitch have been used as raw materials.Briefly,QI-M,QI-O and QI-N have been separated from me-dium pitch,oxidized modified pitch,and thermal polycondensation pitch,respectively.The basic physical properties of three kinds of QIs have been determined by the ultimate analyzer,TGA,particle size analyzer,and polarizing microscope,separately.The microstructure of quinoline insoluble based pitch carbon have been studied by the SEM,XRD,Raman spectrum and the combination of curve-fitted method.The result shown that,QI-M is a kind of submicron carbon sphere with good uniformity.QI-N is a kind of spherical carbon with uniform particle size distribution of about 16μm.The pyrolisis behavior of three quinoline insolubles is varied.Briefly,both of pyrolysis reaction and condensation reaction have been taken place at the temperature range from 250℃to 500℃for QI-O and QI-N,respectively.However,only pyrolysis reaction has been taken place for QI-M at this temperature range.The contents of graphite crystal(I G/I All)of quinoline insoluble based pitch carbon(QI-M-C,QI-O-C and QI-N-C)were 10.61%,6.84%,and 12.43%,respectively.And the contents of disordered carbon(I D3/I All)were 9.18%,11.09%,and 6.06%,separately.What’s more,the crystalline sizes(L c)of each quinoline insoluble based pitch carbons were 1.62 nm,1.35 nm,and 1.85 nm.QI-N has good graphitization ability,but the graphitization ability of QI-O was poor.
作者
岳莉
朱亚明
高丽娟
胡朝帅
赖仕全
赵雪飞
YUE Li;ZHU Yaming;GAO Lijuan;HU Chaoshuai;LAI Shiquan;ZHAO Xuefei(School of Chemical Engineering,University of Science and Technology Liaoning,Anshan 114051,China;Liaoning Provincial Key Laboratory of Chemical Metallurgy,Anshan 114051,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2020年第8期77-82,共6页
Materials Reports
基金
国家自然科学基金(U1361126)
辽宁省自然科学基金(20180551218)
辽宁省教育厅项目(2017LNQN04)
辽宁科技大学优秀人才培养项目(2018RC07)
辽宁科技大学青年基金(2017QN06)。
关键词
喹啉不溶物
基础物性
微观结构
quinoline insoluble
basic physical properties
microstructure
