PCS-632
Quantification of organic oxygen species on the surface of fresh and reacted Argonne
Premium coal
Kelemen, S.R.; Kwiatek, P.J.
Energy & Fuels
1995
9(5)
841-848
X-ray photoelectron spectroscopy (XPS) was used to determine the kinds of organic
and inorganic oxygen species present in Argonne Premium coal. In most cases the XPS
results for organic oxygen with fresh coal compare favorably with other methods of
analysis. The evolution of CO[sub 2], CO, and H[sub 2]O during pyrolysis at
400[degree]C was quantified, and their appearance was associated with the loss of hydroxyl and
carboxyl groups in fresh coal. Oxidation of fresh coal at 125[degree]C in air resulted in
significant increases in the level of iron and inorganic sulfate on the coal surface.
Oxidation of subbituminous and lower rank coal resulted in increases in the level of
carboxyl species but decreases in the level of hydroxyl species. The levels of carboxyl,
carbonyl, and other species increase upon oxidation of bituminous and higher rank coal.
The advantages and limitations of the XPS approach for quantifying organic oxygen
functionalities in coal are discussed. 44 refs., 8 figs., 13 tabs.
1. Upper Freeport,PA (UF)
2. Wyodak-Anderson, WY (WY)
3. Illinois #6 (IL)
4. Pittsburgh #8 (PIT)
5. Pocahontas #3 (POC)
6. Blind Canyon,UT (UT)
7. Lewiston-Stockton, WV (WV)
8. Beulah-Zap, ND (ND)