Single-pulse excitation 13C NMR measurements on the Argonne premium coal samples
Single-pulse excitation 13C NMR measurements on the Argonne premium coal samples
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DOI：
10.1021/ef00035a009
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发表时间：
1992-09
期刊：
影响因子：
5.3
通讯作者：
J. A. Franz;Roberto García;J. Linehan;G. Love;C. Snape
中科院分区：
文献类型：
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作者：
J. A. Franz;Roberto García;J. Linehan;G. Love;C. Snape
鉴于这项研究的结果和有据可查的固有问题与交叉极化（CP）13 C NMR有关的量化煤，现在很清楚，更耗时的单脉冲激发（SPE）或布洛赫衰减测量是必不可少的获得煤的芳香性和其他碳骨架参数。在低和高场强（分别为25和75 MHz）下对阿贡优质煤样品进行SPE 13 C NMR，高速魔角旋转（13 kHz）用于抑制较高场强下的旋转边带
In view of the results of this study and the well-documented inherent problems with cross-polarization (CP) 13 C NMR concerning quantification for coals, it is now clear that the more time-consuming single-pulse excitation (SPE) or Bloch decay measurements are essential for obtaining aromaticities and other carbon skeletal parameters for coals. SPE 13 C NMR has been carried out on the Argonne Premium Coal Samples at both a low and a high field strength (25 and 75 MHz, respectively), high-speed magic angle spinning (13 kHz) being used to suppress spinning sidebands at the higher field