Fluorescence Spectroscopy Characterization of Asphaltene Liquefied from Coal and Study of Its Association Structure
WANG Zhi-cai, CUI Xue-ping, SHUI Heng-fu, WANG Zu-shan, LEI Zhi-ping, KANG Shi-gang
Anhui Key Laboratory of Clean Coal Conversion & Utilization，School of Chemistry and Chemical Engineering, and Anhui University of Technology, Ma’anshan 243002, China
Abstract：Structure and association of asphaltenes from coal direct hydroliquefaction were studied by fluorescence spectrometry and UV-Vis absorption spectrometry in this paper. The results indicate that asphaltene is aromatic mixtures mainly containing naphthalene nucleus and shows strong fluorescent characteristic. The forming of exciplex between asphaltene and solvent results in the red shift of fluorescence peak and fluorescence quenching of asphaltene that increases with the polarity and electron acceptability. The self-aggregation of asphaltene is formed by non-covalent bond interaction, so that the asphaltene liquefied at higher temperture that shows high aromaticity has stronger association than that liquefied at lower temperature. Aggregation of asphaltene has been found to be a gradual process, in which there is no critical aggregation constant observed, and the inflection point of the plot of apparent fluorescence intensity as a function of asphaltene concentration varies with the excitation wavelength.
Key words：Liquefaction of coal;Asphaltene;Fluorescence spectrometry;Association structure
王知彩，崔雪萍，水恒福，王祖山，雷智平，康士刚 . 煤液化沥青烯的荧光光谱表征及缔合结构研究 [J]. 光谱学与光谱分析, 2010, 30(06): 1530-1534.
WANG Zhi-cai, CUI Xue-ping, SHUI Heng-fu, WANG Zu-shan, LEI Zhi-ping, KANG Shi-gang . Fluorescence Spectroscopy Characterization of Asphaltene Liquefied from Coal and Study of Its Association Structure . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2010, 30(06): 1530-1534.
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