Two types of coal with different degrees of coalification were used to study the effect of their chem. compn. on sorption properties. Contents of volatile parts and elemental C in the coals were 29.2% and 86.4% and 40.9% and 79.6%, resp. Both coal types were used sep. to measure MeH sorption at 298 and 308 K and variable pressure conditions under 0-2.5 MPa. Based on the obtained isotherms, isosteric heats of MeH sorption were detd. They were 28.3-31.3 kJ/mol and 11.6-14.0 kJ/mol, resp.