神东上湾煤及其显微组分富集物结构特征研究

STRUCTURAL CHARACTERIZATION OF SHENDONG SHANGWAN COAL AND ITS MACERAL

采用13C-CP/MAS NMR和FTIR测试手段对神东上湾煤及其显微组分富集物进行了分析表征,并对其相关结构特征进行了讨论.结果表明,惰质组富集物较原煤和镜质组富集物有较高的芳香度,桥头芳碳(faB)也较高,大分子芳香结构以萘和蒽结构为主;镜质组富集物有较多的烷基化取代芳碳和脂肪碳,氢含量相对较多,结构中富含链状烷烃、环状烷烃和芳甲基等,大分子芳香结构以苯结构为主;原煤结构中含有较多的faHl(季碳、CH和CH2)和faOl(氧接脂碳),原煤芳香结构以萘结构为主.三个煤样结构中羟基缔合程度都比较大,有较强的CC骨架伸缩振动峰,镜质组富集物的Hal/Har为2.18,远远高于原煤(1.52)和惰质组富集物(1.36),说明镜质组富集物有较多的脂肪结构;与原煤相比,镜质组和惰质组富集物大分子结构中有较多伸缩振动的—CH2.

Shendong Shangwan coal and its macerals of vitrinite and inertinite were ana- lyzed by 13C-CP/MAS NMR and FTIR and relative structural parameters were also discussed. The results indicate that inertinite has a higher aromaticity and aromatic bridgehead carbons than those of parent coal and vitrinite. The types of naphthalene and anthracene were main aromatic structure in inertinite macrostructure. Vitrinite had more alkylated aromatic, paraffin hydrocar- bon, cycloalkanes, aliphatic carbon and higher hydrogen content. The type of benzene was the main aromatic structure; the macrostructure of parent coal has more falH（quanternary carbon, CH and CH2） and bonded to oxygen（falO） and naphthalene was its main aromatic structure. The de- gree of hydroxy association of three sample and C=C stretching vibration are also stronger. The ratio Hal/Har of vitrinite 2.18 is much higher than that of parent coal（1.52） and inertinite（1.36）, which was consistent with the fact that vitrinite had lower aromaticity; the macrostructure of vi- trinite and inertinite have more stretching vibration --CH2 than that of parent coal.