Abstract
AbstractX‐ray scattering intensities have been obtained of seven vitrinites of different rank and a natural graphite before and after treatment with lithium in ethylenediamine. Scattering intensities showed extensive changes in the arrangement of carbon atoms. The major apparent change occurred at low and moderately low scattering angles. The peaks attributed to parallel packing of aromatic layers were displaced to lower angles corresponding to increase in d‐spacings from about 3·6 to 4·6Å. These findings suggest that conversion of planar aromatic layers to buckled hydrogenated rings has occurred. Graphite was partly hydrogenated and showed a distinct new peak at a d‐spacing of 4·8Å, in addition to the (002) peak at 3·35Å.The treated vitrinites showed less small‐angle scattering, the decrease probably being caused by expansion of the layers at the expense of small pores, that is, inhomogeneities. For medium‐ and high‐rank coals, the scattering intensities at high angles showed only minor changes consistent with conversion of aromatic to alicyclic structures and not to open chain structures.
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