Solid State 13C NMR in Coal Research: Selected Techniques and Application
作者： Francis P. Miknis
DOI: 10.1007/978-94-009-3045-2_5
关键词: Spectroscopy 、 Chemistry 、 Sideband 、 Coal 、 Dephasing 、 Aromaticity 、 Analytical chemistry 、 Carbon-13 NMR 、 Pyrolysis 、 Polarization (waves)
摘要: Developments in solid-state 13C NMR techniques and their applications coal research are reviewed. These include cross polarization magic-angle spinning with high-power decoupling, dipolar dephasing, sideband suppression at high magnetic fields, dynamic nuclear combined rotation multiple pulse spectroscopy. The quantitative reliability of aromaticity measurements is also discussed. Results from recent studies indicate that not all the carbons observed measurements. Thus, question remains unresolved. Selected for study pyrolysis hydroliquefaction coals presented. these can provide valuable information about changes occur during processing.
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