Adsorption and desorption of CO2 on Korean coal under subcritical to supercritical conditions

Junwei He, Yao Shi, Sol Ahn, Jeong Won Kang, Chang Ha Lee

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

Coal seams have been reported as possible storage sites for CO2 to help mediate the global greenhouse gas problem. The adsorption and desorption characteristics of CO2 on dry and wet (3.64 wt %) Korean coal (Kyungdong, anthracite coal) were studied using a static volumetric method at 298 and 318 K, and up to 150 atm. The adsorption of CO2 was favorable at low temperatures and dry coal conditions. The hysteresis of coal swelling through adsorption, desorption, and readsorption of CO2 was observed at subcritical condition. Hysteresis between adsorption and desorption isotherms occurred in both dry and wet coals. The crossover between adsorption and desorption isotherms in dry coal was observed near the critical region, while the excess amount of adsorbed CO2 on wet coal was lower during desorption than during adsorption. Structural variations of the coal after the wet experiment were significant compared to those in the dry coal. In wet coal, the dissolution of H2O in the CO2 phase, absorption of CO2 in the aqueous phase, and coal structure changes affected the estimation of adsorption amount, especially under supercritical condition.

Original languageEnglish
Pages (from-to)4854-4861
Number of pages8
JournalJournal of Physical Chemistry B
Volume114
Issue number14
DOIs
Publication statusPublished - 2010 Apr 15

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Coal
coal
Desorption
desorption
Adsorption
adsorption
Isotherms
Hysteresis
isotherms
hysteresis
anthracite
Anthracite
greenhouses
Greenhouse gases
swelling
Swelling
crossovers
dissolving
Dissolution

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Chemistry
  • Surfaces, Coatings and Films

Cite this

Adsorption and desorption of CO2 on Korean coal under subcritical to supercritical conditions. / He, Junwei; Shi, Yao; Ahn, Sol; Kang, Jeong Won; Lee, Chang Ha.

In: Journal of Physical Chemistry B, Vol. 114, No. 14, 15.04.2010, p. 4854-4861.

Research output: Contribution to journalArticle

He, Junwei ; Shi, Yao ; Ahn, Sol ; Kang, Jeong Won ; Lee, Chang Ha. / Adsorption and desorption of CO2 on Korean coal under subcritical to supercritical conditions. In: Journal of Physical Chemistry B. 2010 ; Vol. 114, No. 14. pp. 4854-4861.
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