Measuring and modeling the competitive adsorption of CO{sub 2}, CH{sub 4}, and N{sub 2} on a dry coal
- ETH, Zurich (Switzerland)
Data on the adsorption behavior of CO{sub 2}, CH{sub 4}, and N{sub 2} on coal are needed to develop enhanced coalbed methane (ECBM) recovery processes, a technology where the recovery of CH{sub 4} is enhanced by injection of a gas stream consisting of either pure CO{sub 2}, pure N{sub 2}, 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{sup o}C for the pure gases and of 45{sup o}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 CO{sub 2} over CH{sub 4} and N{sub 2}, which therefore indicate that ECBM may be a viable option for the permanent storage of CO{sub 2}.
- OSTI ID:
- 21095865
- Journal Information:
- Langmuir, Vol. 24, Issue 7; ISSN 0743-7463
- Country of Publication:
- United States
- Language:
- English
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