Measuring and modeling the competitive adsorption of CO{sub 2}, CH{sub 4}, and N{sub 2} on a dry coal

Journal Article · Mon Sep 15 04:00:00 EDT 2008 · Langmuir

DOI:https://doi.org/10.1021/la801350h· OSTI ID:21095865

Ottiger, S; Pini, R; Storti, G; Mazzotti, M ^[1]

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1. 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, Journal Name: Langmuir Journal Issue: 7 Vol. 24; ISSN LANGD5; ISSN 0743-7463
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
ADSORPTION
ADSORPTION ISOTHERMS
BENCH-SCALE EXPERIMENTS
CARBON DIOXIDE
CARBON SEQUESTRATION
COAL
COAL SEAMS
ENHANCED RECOVERY
EQUATIONS
MATHEMATICAL MODELS
METHANE
NITROGEN
SORPTIVE PROPERTIES
UNDERGROUND STORAGE