Carbon Dioxide Sequestration In Coal:
Implications For CO2 Disposal And
CH4 Displacement From Coal Seams
Author(s)
M. Mirzaeian & P. J. Hall
Abstract
The sequestration of CO2 within unmineable coal seams is one of the most
attractive options for reducing atmospheric CO2 levels. Thus there is currently
considerable interest in the interactions of coal with CO2 for its long-term
disposal. This paper reports the analysis of coal / CO2 interactions at pressures of
up to 30 bar. The results obtained from differential scanning calorimetry (DSC)
show that the interactions of CO2 with coal leads to strongly bound carbon
dioxide on coal. It was also found that the temperature of the second order phase
transition of coal decreases with increase in CO2 pressure significantly,
indicating that high pressure CO2 diffuses through coal matrix, causes significant
plasticization effects, and changes the macromolecular structure of the coal.
Desorption characteristics of CO2 from coal were studied by temperature
programmed desorption mass spectrometry (TPD-MS). It was found that CO2
binds more strongly to coal and demands more energy to desorb from coal at
higher pressures.
Keywords: CO2 sequestration, coal, irreversible adsorption, high pressure
interactions, macromolecular structure.
1 Introduction
Increased atmospheric CO2 concentrations due to fossil fuel combustion cause
entrapment of solar radiation in the atmosphere and induce a gradual warming of
the Earth’s surface (Greenhouse effect). This problem is now recognized as one
of the most important environmental issues facing society. Therefore there is
Keywords
CO2 sequestration, coal, irreversible adsorption, high pressureinteractions, macromolecular structure.
Related Book
Other papers in this volume
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