Analysis of CO2 adsorption in different lytotypes of lignite

The problem of reducing CO2 emissions in the atmosphere is indirectly related to the potential storage options in different environments in the earth's crust. One of the promising possibilities for reducing emissions of carbon dioxide (CO2) into the atmosphere is the geological storage of CO2 in deep, unminable coal seams. Measurements of the CO2 adsorption of 10 lignite samples from the Velenje Coal Mine and different rocks and soils from surrounding areas were carried out using Langmuir isotherm principles. Adsorption measurements were taken using the gravimetric method, where exposed samples at a selected temperature to different CO2 pressures were done. Also, the measures of mass changes in the measuring and reference cells were the basis of calculations for the mass and volume of the adsorbed CO2. Measurements were taken at a temperature of 23 degrees C and at CO2 pressures varying from 18 to 38 bars. The results of laboratory investigations of the lignite from the Velenje Coal Mine have shown the capacity adsorption from 9 to 14 m3 CO2/ton (at measuring pressures up to 4 MPa) of coal in the given conditions, which cannot compare with other rocks and soils.