Measuring and Modeling the Competitive Adsorption of CO2, CH4, and N2 on a Dry Coal
- 5 August 2008
- journal article
- research article
- Published by American Chemical Society (ACS) in Langmuir
- Vol. 24 (17), 9531-9540
- https://doi.org/10.1021/la801350h
Abstract
Data on the adsorption behavior of CO2, CH4, and N2 on coal are needed to develop enhanced coalbed methane (ECBM) recovery processes, a technology where the recovery of CH4 is enhanced by injection of a gas stream consisting of either pure CO2, pure N2, or a mixture of both. The pure, binary, and ternary adsorption of these gases on a dry coal from the Sulcis Coal Province in Italy has been measured at pressures up to 180 bar and temperatures of 45 and 70 °C for the pure gases and of 45 °C for the mixtures. The experiments were performed in a system consisting of a magnetic suspension balance using a gravimetric−chromatographic technique. The excess adsorption isotherms are successfully described using a lattice density functional theory model based on the Ono−Kondo equations exploiting information about the structure of the coal, the adsorbed gases, and the interaction between them. The results clearly show preferential adsorption of CO2 over CH4 and N2, which therefore indicate that ECBM may be a viable option for the permanent storage of CO2.Keywords
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