Behavior and effect of different coal microlithotypes during gas transport for carbon dioxide sequestration into coal seams

C. Özgen Karacan, Gareth D. Mitchell

Research output: Contribution to journalArticle

134 Citations (Scopus)

Abstract

The behavior and effect of different coal lithotypes during sequestration of carbon dioxide (CO 2 ) into coal seams are important knowledge gaps when modeling sequestration processes and planning for field application. This paper presents the results of a laboratory study for sequestration of CO 2 in a 2.5-cm diameter Pittsburgh coal sample. During the test, the sample was kept under a constant effective stress during gas uptake and CO 2 storage was observed by qualitative and quantitative X-ray computerized tomography (CT) scanning. Petrographic analysis was also performed on the sample after the sequestration test to identify the microlithotypes showing different adsorption behavior. Qualitative X-ray computerized tomography (CT) and petrographic analysis showed that different microlithotypes behave differently during gas adsorption. Vitrite was observed to swell and to decrease the initial density about 5%, when CO 2 diffused into the micropores. A density increase was observed in other microlithotypes present in the sample due to gas adsorption. The CT images were quantified to map the temporal and spatial variation of mass change of coal due to CO 2 adsorption. These data were used to study the equilibrium isotherm parameters and to investigate the kinetics of the adsorption process for calculating the diffusivity of CO 2 in different microlithotypes. Quantitative analysis of X-ray CT images indicated that the regions that were rich in inertite and clay stored higher quantities of gas in the adsorbed phase compared to other organic microlithotypes in the sample. Calculations for adsorption kinetics in different microlithotypes indicated that pore diffusion is the prime mechanism. However, only an order of magnitude difference between pore and surface diffusion coefficients suggested that both phenomena might be important for CO 2 sequestration process. The calculated pore diffusion coefficients were higher in clay and inertinite regions. But, surface diffusion started to increase in vitrinite- and liptinite-rich regions, where pore diffusion was limited.

Original languageEnglish (US)
Pages (from-to)201-217
Number of pages17
JournalInternational Journal of Coal Geology
Volume53
Issue number4
DOIs
StatePublished - Jan 1 2003

Fingerprint

gas transport
coal seam
carbon sequestration
Computerized tomography
Carbon dioxide
Coal
coal
adsorption
tomography
Adsorption
Gases
Gas adsorption
Surface diffusion
X rays
Clay
gas
Kinetics
clay
lithotype
kinetics

All Science Journal Classification (ASJC) codes

  • Fuel Technology
  • Geology
  • Economic Geology
  • Stratigraphy

Cite this

@article{d4456ebd71924bca9e0711dea3a78d72,
title = "Behavior and effect of different coal microlithotypes during gas transport for carbon dioxide sequestration into coal seams",
abstract = "The behavior and effect of different coal lithotypes during sequestration of carbon dioxide (CO 2 ) into coal seams are important knowledge gaps when modeling sequestration processes and planning for field application. This paper presents the results of a laboratory study for sequestration of CO 2 in a 2.5-cm diameter Pittsburgh coal sample. During the test, the sample was kept under a constant effective stress during gas uptake and CO 2 storage was observed by qualitative and quantitative X-ray computerized tomography (CT) scanning. Petrographic analysis was also performed on the sample after the sequestration test to identify the microlithotypes showing different adsorption behavior. Qualitative X-ray computerized tomography (CT) and petrographic analysis showed that different microlithotypes behave differently during gas adsorption. Vitrite was observed to swell and to decrease the initial density about 5{\%}, when CO 2 diffused into the micropores. A density increase was observed in other microlithotypes present in the sample due to gas adsorption. The CT images were quantified to map the temporal and spatial variation of mass change of coal due to CO 2 adsorption. These data were used to study the equilibrium isotherm parameters and to investigate the kinetics of the adsorption process for calculating the diffusivity of CO 2 in different microlithotypes. Quantitative analysis of X-ray CT images indicated that the regions that were rich in inertite and clay stored higher quantities of gas in the adsorbed phase compared to other organic microlithotypes in the sample. Calculations for adsorption kinetics in different microlithotypes indicated that pore diffusion is the prime mechanism. However, only an order of magnitude difference between pore and surface diffusion coefficients suggested that both phenomena might be important for CO 2 sequestration process. The calculated pore diffusion coefficients were higher in clay and inertinite regions. But, surface diffusion started to increase in vitrinite- and liptinite-rich regions, where pore diffusion was limited.",
author = "Karacan, {C. {\"O}zgen} and Mitchell, {Gareth D.}",
year = "2003",
month = "1",
day = "1",
doi = "10.1016/S0166-5162(03)00030-2",
language = "English (US)",
volume = "53",
pages = "201--217",
journal = "International Journal of Coal Geology",
issn = "0166-5162",
publisher = "Elsevier",
number = "4",

}

Behavior and effect of different coal microlithotypes during gas transport for carbon dioxide sequestration into coal seams. / Karacan, C. Özgen; Mitchell, Gareth D.

In: International Journal of Coal Geology, Vol. 53, No. 4, 01.01.2003, p. 201-217.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Behavior and effect of different coal microlithotypes during gas transport for carbon dioxide sequestration into coal seams

AU - Karacan, C. Özgen

AU - Mitchell, Gareth D.

PY - 2003/1/1

Y1 - 2003/1/1

N2 - The behavior and effect of different coal lithotypes during sequestration of carbon dioxide (CO 2 ) into coal seams are important knowledge gaps when modeling sequestration processes and planning for field application. This paper presents the results of a laboratory study for sequestration of CO 2 in a 2.5-cm diameter Pittsburgh coal sample. During the test, the sample was kept under a constant effective stress during gas uptake and CO 2 storage was observed by qualitative and quantitative X-ray computerized tomography (CT) scanning. Petrographic analysis was also performed on the sample after the sequestration test to identify the microlithotypes showing different adsorption behavior. Qualitative X-ray computerized tomography (CT) and petrographic analysis showed that different microlithotypes behave differently during gas adsorption. Vitrite was observed to swell and to decrease the initial density about 5%, when CO 2 diffused into the micropores. A density increase was observed in other microlithotypes present in the sample due to gas adsorption. The CT images were quantified to map the temporal and spatial variation of mass change of coal due to CO 2 adsorption. These data were used to study the equilibrium isotherm parameters and to investigate the kinetics of the adsorption process for calculating the diffusivity of CO 2 in different microlithotypes. Quantitative analysis of X-ray CT images indicated that the regions that were rich in inertite and clay stored higher quantities of gas in the adsorbed phase compared to other organic microlithotypes in the sample. Calculations for adsorption kinetics in different microlithotypes indicated that pore diffusion is the prime mechanism. However, only an order of magnitude difference between pore and surface diffusion coefficients suggested that both phenomena might be important for CO 2 sequestration process. The calculated pore diffusion coefficients were higher in clay and inertinite regions. But, surface diffusion started to increase in vitrinite- and liptinite-rich regions, where pore diffusion was limited.

AB - The behavior and effect of different coal lithotypes during sequestration of carbon dioxide (CO 2 ) into coal seams are important knowledge gaps when modeling sequestration processes and planning for field application. This paper presents the results of a laboratory study for sequestration of CO 2 in a 2.5-cm diameter Pittsburgh coal sample. During the test, the sample was kept under a constant effective stress during gas uptake and CO 2 storage was observed by qualitative and quantitative X-ray computerized tomography (CT) scanning. Petrographic analysis was also performed on the sample after the sequestration test to identify the microlithotypes showing different adsorption behavior. Qualitative X-ray computerized tomography (CT) and petrographic analysis showed that different microlithotypes behave differently during gas adsorption. Vitrite was observed to swell and to decrease the initial density about 5%, when CO 2 diffused into the micropores. A density increase was observed in other microlithotypes present in the sample due to gas adsorption. The CT images were quantified to map the temporal and spatial variation of mass change of coal due to CO 2 adsorption. These data were used to study the equilibrium isotherm parameters and to investigate the kinetics of the adsorption process for calculating the diffusivity of CO 2 in different microlithotypes. Quantitative analysis of X-ray CT images indicated that the regions that were rich in inertite and clay stored higher quantities of gas in the adsorbed phase compared to other organic microlithotypes in the sample. Calculations for adsorption kinetics in different microlithotypes indicated that pore diffusion is the prime mechanism. However, only an order of magnitude difference between pore and surface diffusion coefficients suggested that both phenomena might be important for CO 2 sequestration process. The calculated pore diffusion coefficients were higher in clay and inertinite regions. But, surface diffusion started to increase in vitrinite- and liptinite-rich regions, where pore diffusion was limited.

UR - http://www.scopus.com/inward/record.url?scp=0037363019&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037363019&partnerID=8YFLogxK

U2 - 10.1016/S0166-5162(03)00030-2

DO - 10.1016/S0166-5162(03)00030-2

M3 - Article

VL - 53

SP - 201

EP - 217

JO - International Journal of Coal Geology

JF - International Journal of Coal Geology

SN - 0166-5162

IS - 4

ER -