Sorption and desorption of gases (CH4, CO2) on hard coal and active carbon at elevated pressures
1998; Elsevier BV; Volume: 77; Issue: 11 Linguagem: Inglês
10.1016/s0016-2361(98)00022-2
ISSN1873-7153
Autores Tópico(s)Atmospheric and Environmental Gas Dynamics
ResumoThe study of sorption and desorption of carbon dioxide and methane on three samples of hard coal with different Cdaf content and on the active carbon is presented in this paper. The sorption isotherms were measured by means of the volumetric method at two temperatures, 288 and 298 K, at pressures up to 6 MPa. The porosities of the samples were determined by measuring their apparent (mercury method) and true density (helium method). The obtained experimental data were described using the thermal sorption equation of virial form. The isosteric heats of sorption were calculated as the coverage function, and the non-isothermal desorption equilibrium curves were also calculated. For each system studied a temperature drop during the desorption down to 1 bar pressure was computed as well. The obtained results indicate an adsorption-absorption mechanism of carbon dioxide and methane on hard coals.
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