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further drying leads to intercalation compound 'coal-MOH' formation. This work has demonstrated that reorganization of over-molecular structure for all investigated coals is found. Emphasis is put on brown coal (Cd"' 73.6%) and anthracite (Cd"' 95.2%) as extreme representatives of rank coals.
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Lakatas, _I. er al. DGMK Tagungsber., 1997, 9702, (Proceedings ICCS '97, Volume I), 79-82. COz and CxHx sorption at ambient temperature was compared and the results were used for characterizing the difference of the structure of hazardous and non-hazardous coals. Hazardous coals were found to be more microporous or contain more closed pores than non-hazardous ones, but this difference could not be enlarged and attributed to one petrographical component by producing the density fractions. Gas sorption isobars (N?, CH.,, CxHx) are proposed to make a distinction between fine pure structure of coals.
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