PHYSICOCHEMICAL PROPERTIES OF MECSEK COAL .2. COAL-GAS INTERACTIONS

There are two models for interpretation of the internal structure of c oals, One of them supposes that the coal structure is similar to the a ctive carbons having macro- and micropores defined by Dubinin, The sec ond model supposes that the molecules sorbed in the coal are present i n a molecular lattice structure. The authors have measured the sorptio n isotherms and isobars of different gases (nitrogen, methane, carbon dioxide) in coals, They have calculated the equivalent specific surfac e areas and their temperature dependences, The results have been compa red to similar data calculated from methanol-water and methanol-benzen e excess isotherms. It was found that the surface areas calculated fro m gas sorption isotherms and metanol water excess isotherms are compar able. From the methanol-benzene excess isotherms approximately one ord er of magnitude higher surface areas were obtained. This finding was a ttributed to the lamellar structure of Mecsek coal and to the intercal ated clay minerals.