Collect. Czech. Chem. Commun. 1983, 48, 26-33

Influence of high pressure on texture of carbonaceous substances

Jiří Medeka and Ivan Mohylab

a Institute of Geology and Geotechnics, Czechoslovak Academy of Sciences, 182 09 Prague 8
b Research Center of Bateria, 274 01 Slaný


The texture changes of carbonaceous substances caused by high pressure (1 500 Mpa) have been studied by sorption of N2 (at 78 K) and CO2 (at 298 K) and by electron microscopy. The surface increase of cokes is observed in the region of micropores as well as meso- and macropores, whereas that of semicoke is only limited to the region of meso- and macropores. No effect is observed with formed coke and charcoal. Microscopically it has been found that cokes form a layer texture, whereas semicokes show a disconnection of microbreccia character. The surface area increase is ascribed to formation of new surfaces produced by shift and/or deformation of lamellar structures.