NMR imaging of coals

NMR IMAGING OF COALS 3.1. Single-point imaging and SPRITE imaging... 

Table 6. Integrated intensities and average sizes of the mobile component from NMR images of the three coals...

Fig. 34. In situ NMR images of the three coals at the maximum mobility temperature, 400 °C (a) raw coal (b) rapid heated coal (c) slow heated coal.

Fig. 17. NMR 3D and 2D images of (a) Goonyella coal (b) Witbank coal obtained by SPRITE method and (c) Goonyella coal obtained by spin echo method.

This section reports studies on item (1) using solid-state NMR methods ( H CRAMPS, l3C CP/MAS and 13C DD/MAS) and NMR imaging methods. The behaviour from 300 to 550 °C of preheated coals is described using the newly developed high temperature in situ imaging system to clarify the effects of rapid heating on coal properties.98... 

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