Models of pure CO 2 and pure CH 4 adsorption on the late paleozoic coals from the Kailuan Coalfield, Hebei, China

S. Dai; B. Zhang; S. Peng; X. Zhang; C. Chou

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Models of pure CO 2 and pure CH 4 adsorption on the late paleozoic coals from the Kailuan Coalfield, Hebei, China

S. Dai·B. Zhang·S. Peng·X. Zhang·C. Chou

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Abstract

Isothermal adsorption experiments of pure CO 2 and CH 4 on different coals in rank (the No. 11 Coal from the Linnancang Mine and the No. 9 Coal from the Majiagou Mine) from the Kailuan Coalfield of Hebei Province, China, have been studied. Four different models (Langmuir, BET, D-R, and D-A) were used to fit the experimental data of CO 2 and CH 4 adsorption and their fitting degree were investigated. The results showed that the adsorption capacity of the Majiagou coal(R o, ran = 1. 21%) is higher than that of the Linnancang coal (R o, ran = 0. 58%). The adsorption capacity of CO 2 is higher than that of CH 4 on the same coal under the same pressure. The adsorption isotherms of pure CO 2 and pure CH 4 on the Majiagou coal can be classified as Type I and their fitting errors of curves are very weak; thus the experimental data can be presented using the Langmuir isotherm. However, the adsorption of Linnancang coal is more complicated, and can be presented using D-A model because of its minimum error. Monolayer adsorption occurs during the adsorption of pure CO 2 and pure CH 4 on the No. 11 Coal and that of pure CH 4 on the No. 9 Coal.

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S. Dai, B. Zhang, S. Peng, X. Zhang, C. Chou. 2009. Models of pure CO 2 and pure CH 4 adsorption on the late paleozoic coals from the Kailuan Coalfield, Hebei, China. https://pubs.usgs.gov/publication/70034887

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