摘要
通过分子荧光光谱和紫外可见吸收光谱表征、研究了煤液化沥青烯结构及缔合行为。结果发现:煤液化沥青烯属于萘环结构为主的芳香化合物混合体系,具有强的荧光效应;溶剂与沥青烯分子能够形成激态复合物,导致沥青烯荧光峰红移和荧光猝灭;沥青烯分子间存在非共价键缔合作用,高温液化沥青烯芳香度高,缔合作用强;沥青烯分子间缔合属于逐步缔合过程,不存在"临界缔合浓度",其表观荧光强度随浓度变化的临界浓度受激发波长影响。
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.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2010年第6期1530-1534,共5页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金项目(20776001,20876001)
安徽省国际合作项目(07080703001)
安徽工业大学创新团队建设计划项目资助
关键词
煤液化
沥青烯
荧光光谱
缔合结构
Liquefaction of coal
Asphaltene
Fluorescence spectrometry
Association structure
