Thermal evolution of aliphatic and aromatic moieties of asphaltenes from coals of different rank: possible implication to the molecular architecture of asphaltenes  

作　　者：Aminu Bayawa Muhammad 

机构地区：[1]Civil Engineering & Geosciences, Newcastle University

出　　处：《Chinese Journal Of Geochemistry》2015年第3期422-430,共9页中国地球化学学报

基　　金：Petroleum Technology Development Fund (PTDF), Nigeria for Ph.D scholarship

摘　　要：The compositional and structural changes that coal asphaltenes undergo with increasing thermal maturation were investigated using solid-state13 C NMR and Fourier transform infrared spectroscopy. The results show a gradual increase in the relative proportion of carbon content with a concomitant decrease in the hydrogen, sulphur and oxygen content. The amount of aromatic carbon also increases while the aliphatic carbon decreases with increasing maturity. Ester and carboxylic groups are particularly sensitive to maturation and decrease in relative abundance with increasing maturity while the amount of aromatic carbonyl groups increases. In general, the asphaltenes were observed to evolve towards a more thermally stable structure with increasing amounts of aromatic moieties and relatively lower amounts of aliphatic moieties. The results are in agreement with the ultimate dominance of the island molecular architecture(the Yen–Mullins model) in asphaltenes.The compositional coal asphaltenes undergo with tion were investigated using and structural changes that increasing thermal maturasolid-state 13C NMR and Fourier transform infrared spectroscopy. The results show a gradual increase in the relative proportion of carbon content with a concomitant decrease in the hydrogen, sulphur and oxygen content. The amount of aromatic carbon also increases while the aliphatic carbon decreases with increasing maturity. Ester and carboxylic groups are particularly sensitive to maturation and decrease in relative abundance with increasing maturity while the amount of aromatic carbonyl groups increases. In general, the asphaltenes were observed to evolve towards a more thermally stable structure with increasing amounts of aromatic moieties and relatively lower amounts of aliphatic moi- eties. The results are in agreement with the ultimate dominance of the island molecular architecture （the Yen- Mullins model） in asphaltenes.

关 键 词：分子结构 煤沥青基 芳香族 沥青质 热演化 脂肪族 傅里叶变换红外光谱 煤阶 

分 类 号：TQ522.65[化学工程—煤化学工程]