TY - JOUR
T1 - Coal lithotypes before and after saturation with CO2; insights from micro- and mesoporosity, fluidity, and functional group distribution
AU - Mastalerz, Maria
AU - Drobniak, Agnieszka
AU - Walker, R.
AU - Morse, David G.
PY - 2010/9
Y1 - 2010/9
N2 - Four lithotypes, vitrain, bright clarain, clarain, and fusain, were hand-picked from the core of the Pennsylvanian Springfield Coal Member (Petersburg Formation) in Illinois. These lithotypes were analyzed petrographically and for meso- and micropore characteristics, functional group distribution using FTIR techniques, and fluidity. High-pressure CO
2 adsorption isotherm analyses of these lithotypes were performed and, subsequently, all samples were reanalyzed in order to investigate the effects of CO
2. After the high-pressure adsorption isotherm analysis was conducted and the samples were reanalyzed, there was a decrease in BET surface area for vitrain from 31.5m
2/g in the original sample to 28.5m
2/g, as determined by low-pressure nitrogen adsorption. Bright clarain and clarain recorded a minimal decrease in BET surface area, whereas for fusain there was an increase from 6.6m
2/g to 7.9m
2/g. Using low-pressure CO
2 adsorption techniques, a small decrease in the quantity of the adsorbed CO
2 is recorded for vitrain and bright clarain, no difference is observed for clarain, and there is an increase in the quantity of the adsorbed CO
2 for fusain. Comparison of the FTIR spectra before and after CO
2 injection for all lithotypes showed no differences with respect to functional group distribution, testifying against chemical nature of CO
2 adsorption. Gieseler plastometry shows that: 1) softening temperature is higher for the post-CO
2 sample (389.5°C vs. 386°C); 2) solidification temperature is lower for the post-CO
2 sample (443.5°C vs. 451°C); and 3) the maximum fluidity is significantly lower for the post-CO
2 sample (4 ddpm vs. 14 ddpm).
AB - Four lithotypes, vitrain, bright clarain, clarain, and fusain, were hand-picked from the core of the Pennsylvanian Springfield Coal Member (Petersburg Formation) in Illinois. These lithotypes were analyzed petrographically and for meso- and micropore characteristics, functional group distribution using FTIR techniques, and fluidity. High-pressure CO
2 adsorption isotherm analyses of these lithotypes were performed and, subsequently, all samples were reanalyzed in order to investigate the effects of CO
2. After the high-pressure adsorption isotherm analysis was conducted and the samples were reanalyzed, there was a decrease in BET surface area for vitrain from 31.5m
2/g in the original sample to 28.5m
2/g, as determined by low-pressure nitrogen adsorption. Bright clarain and clarain recorded a minimal decrease in BET surface area, whereas for fusain there was an increase from 6.6m
2/g to 7.9m
2/g. Using low-pressure CO
2 adsorption techniques, a small decrease in the quantity of the adsorbed CO
2 is recorded for vitrain and bright clarain, no difference is observed for clarain, and there is an increase in the quantity of the adsorbed CO
2 for fusain. Comparison of the FTIR spectra before and after CO
2 injection for all lithotypes showed no differences with respect to functional group distribution, testifying against chemical nature of CO
2 adsorption. Gieseler plastometry shows that: 1) softening temperature is higher for the post-CO
2 sample (389.5°C vs. 386°C); 2) solidification temperature is lower for the post-CO
2 sample (443.5°C vs. 451°C); and 3) the maximum fluidity is significantly lower for the post-CO
2 sample (4 ddpm vs. 14 ddpm).
KW - ISGS
KW - Fluidity
KW - FTIR
KW - Coal
KW - Porosity
KW - CO sequestration
KW - Lithotypes
UR - http://www.scopus.com/inward/record.url?scp=77956175887&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77956175887&partnerID=8YFLogxK
U2 - 10.1016/j.coal.2010.06.007
DO - 10.1016/j.coal.2010.06.007
M3 - Article
VL - 83
SP - 467
EP - 474
JO - International Journal of Coal Geology
JF - International Journal of Coal Geology
IS - 4
ER -