Abstract
Small angle neutron scattering (SANS) has been applied to examine the effect of high
pressure CO2 on the structure of Wyodak coal. Significant decrease in the scattering intensities
upon exposure of the coal to high pressure CO2 showed that high pressure CO2 rapidly adsorbs on
the coal and reaches to all pores in the structure. This is confirmed by strong and steep exothermic
peaks observed on DSC scans during coal/ CO2 interactions. In situ small angle neutron scattering
on coal at high pressure CO2 atmosphere showed an increase in scattering intensities with time
suggesting that after adsorption, high pressure CO2 immediately begins to diffuse into the coal
matrix, changes the macromolecular structure of the coal, swells the matrix and probably creates
microporosity in coal structure by extraction of volatile components from coal. Significant decrease in the glass transition temperature of coal caused by high pressure CO2 also confirms that CO2 at elevated pressures dissolve in the coal matrix, results in significant plasticization and physical rearrangement of the coal’s macromolecular structure.
Original language | English |
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Pages (from-to) | 5271-5281 |
Number of pages | 11 |
Journal | Journal of Materials Science |
Volume | 45 |
Issue number | 19 |
DOIs | |
Publication status | Published - Oct 2010 |
ASJC Scopus subject areas
- Mechanical Engineering
- Mechanics of Materials
- General Materials Science