C-13 SOLID-STATE NMR OF ARGONNE PREMIUM COALS
C-13 SOLID-STATE NMR OF ARGONNE PREMIUM COALS
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DOI：
10.1021/ef00014a012
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发表时间：
1989-03-01
期刊：
影响因子：
5.3
通讯作者：
GRANT, DM
中科院分区：
文献类型：
--
作者：
SOLUM, MS;PUGMIRE, RJ;GRANT, DM
用13C CP/MAS核磁共振技术研究了8个Argonne优质煤样品和其他3个氧化煤样品。对每种煤进行了自旋晶格弛豫、变接触时间和偶极去相实验。报道了11种煤的芳香区和脂肪区质子自旋-晶格弛豫时间TiH、旋转框架内质子自旋-晶格弛豫时间TipK和交叉极化时间TCH以及偶极减相时间常数TG和TL。这些数据，连同正常的CP/MAS集成在选定的化学位移范围内，已经被用来得出12个参数与碳骨架结构，包括芳香性。根据核磁共振测量的桥头堡或内碳的摩尔分数，可以估计每种煤的芳香簇大小。
Eight Argonne Premium Coal samples and three other oxidized coals have been investigated by the 13C CP/MAS NMR technique. Spin-lattice relaxation, variable contact time, and dipolar-de-phasing experiments were performed on each coal. The proton spin-lattice relaxation time, TiH, the proton spin-lattice relaxation in the rotating frame time, TipK, and the cross-polarization time, TCH, are reported along with the dipolar-dephasing time constants, TG and TL, for both the aromatic and aliphatic regions of the 11 coals. Thesedata, together with normal CP/MAS integrations over selected chemical shift ranges, have been used to derive 12 parameters relating to the carbon skeletal structure, including the aromaticity. From the mole fraction of bridgehead or inner carbons as measured by NMR, the aromaticcluster size may be estimated for each coal.