Abstract
This chapter presents a solid-state C13-NMR study on the initial stage of coal liquefaction. Illinois #6 coal was used in this study. The coal was ground to under 200 mesh and was dried just before use. Hydrogenated anthracene oil (HAO) was used as a solvent. HAO was prepared by hydrogenation of anthracene oil with Ni–Mo catalyst at 15 MPa of hydrogen at 380°C for 2 h. The preheating reactor was constructed by six stainless steel pipes of 3 m length connected in a series. The temperature of each pipe was controlled by an individual heater. Six sampling vessels were connected to each pipe through sampling valves. The pipe reactor and sampling vessels were kept at a certain pressure by a regulating valve. In the conventional CP/MAS spectra, several spinning side-bands appeared, and one of them overlapped completely with the aliphatic bands in the spectrum obtained with 4 kHz spinning.
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