TY - JOUR
T1 - The temperature effect on the methane and CO2 adsorption capacities of Illinois coal
AU - Guan, Cheng
AU - Liu, Shimin
AU - Li, Chengwu
AU - Wang, Yi
AU - Zhao, Yixin
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China ( 51274206 and 51404277 ); State Key Lab of Coal Resources and Safe Mining – China University of Mining and Technology ( SKLCRSM16KFA02 ); and the Chinese Scholarship Council (CSC).
Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2018
Y1 - 2018
N2 - The sorption capacity of coal is influenced by temperature, coal rank, mineral composition and moisture content. In the study, we experimentally measure the methane and carbon dioxide sorption capacity at various temperature for Illinois coal. A volumetric adsorption apparatus was employed to determine the excess gas adsorption capacity, and then the absolute adsorption capacity was estimated through the adsorbed gas phase density correction at each tested pressure. The adsorption isotherms were estimated for various temperatures from 283.15 K to 343.15 K. The experimental results indicated that both the methane and carbon dioxide adsorption capacities decrease linearly with an increase in temperature from 283.15 K up to 323.15 K, and the adsorption capacity reduction for CO2 is more significant than that for methane. When the temperature is equal to or greater than 323.15 K, the adsorption capacities are independent of the temperature and remain constant for both gases. This means that there is a “critical temperature point” at which the influence of the temperature on the adsorption capacity vanishes, and the adsorption isotherms are very similar when the temperature is beyond the critical temperature point. The ratios of the CO2/CH4 absolute adsorption capacities vary from 2.62 and 3.80 with the tested pressures and temperatures.
AB - The sorption capacity of coal is influenced by temperature, coal rank, mineral composition and moisture content. In the study, we experimentally measure the methane and carbon dioxide sorption capacity at various temperature for Illinois coal. A volumetric adsorption apparatus was employed to determine the excess gas adsorption capacity, and then the absolute adsorption capacity was estimated through the adsorbed gas phase density correction at each tested pressure. The adsorption isotherms were estimated for various temperatures from 283.15 K to 343.15 K. The experimental results indicated that both the methane and carbon dioxide adsorption capacities decrease linearly with an increase in temperature from 283.15 K up to 323.15 K, and the adsorption capacity reduction for CO2 is more significant than that for methane. When the temperature is equal to or greater than 323.15 K, the adsorption capacities are independent of the temperature and remain constant for both gases. This means that there is a “critical temperature point” at which the influence of the temperature on the adsorption capacity vanishes, and the adsorption isotherms are very similar when the temperature is beyond the critical temperature point. The ratios of the CO2/CH4 absolute adsorption capacities vary from 2.62 and 3.80 with the tested pressures and temperatures.
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U2 - 10.1016/j.fuel.2017.09.046
DO - 10.1016/j.fuel.2017.09.046
M3 - Article
AN - SCOPUS:85029684805
SN - 0016-2361
VL - 211
SP - 241
EP - 250
JO - Fuel
JF - Fuel
ER -