Abstract
The present review is mainly concerned with the study on the coal structure using solid state NMR, especially for the relationship between relaxation times and coal dynamic structures.
The reports on the measurement of T1H (spin-lattice relaxation time) and T2H (spin-spin relaxation time) of coal were mainly reviewed. These two parameters directly relate to the molecular mobility. Thus the measurement of these relaxation times could make an investigation for coal molecular mobility.
The influence of water existing in coals and the swelling of coals derived by organic solvents to the relaxation time and the changes of the coal molecular mobility by heating were also studied.
More information on the chemical structure of coal and the structural changes of coal during various reactions could be obtained in the basis of molecular mobility using solid state NMR.
