| Autor: |
Yves Gensterblum, Bernhard M. Krooss, Alexej Merkel, Alexandra Amann |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
International Journal of Coal Geology. :181-192 |
| ISSN: |
0166-5162 |
| DOI: |
10.1016/j.coal.2015.09.006 |
| Popis: |
Competitive sorption of CH 4 and CO 2 from a two-component gas mixture has been studied on three coals of different rank (subbituminous coal, high-volatile bituminous coal and anthracite). On each coal, binary excess sorption isotherms were measured in the dry state and after moisture-equilibration at 53% and 97% relative humidity (RH), to investigate the effect of pre-adsorbed water on the CH 4 and CO 2 sorption and selectivity at 318 K. Excess sorption isotherms were determined using a manometric setup and CH 4 /CO 2 feed gas mixtures containing between 70 and 85% of CH 4 . The total gas (CH 4 + CO 2 ) excess sorption capacity is reduced by pre-adsorbed moisture, which is most pronounced for the subbituminous coal. A large decrease in excess sorption capacity was observed for the 53% RH moisture equilibrated samples, whereas only a small further decrease was observed upon moisturization to 97% RH. The anthracite had the highest sorption capacity by far, regardless of the amount of pre-adsorbed water. All measurements show a preferential sorption of CO 2 at all three moisture states. The CO 2 selectivity over CH 4 tends to decrease with increasing maturity and moisture content. The mean CO 2 selectivity for the three investigated coals varies between 6 and 9. The extended Langmuir model for adsorption of gas mixtures is shown to be an acceptable first order approximation of the measured competitive sorption isotherm. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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