J. Phys. IV France 7 (1997) C2-809-C2-810
The Chemical Nature of Oxidized Sulphur in Asphaltenes from X-Ray Absorption SpectroscopyM. Kasrai1, G.M. Bancroft1, R. Brunner1 and J. Connan2
1 Department of Chemistry, University of Western Ontario, London, Ontario N6A 5B7, Canada
2 Exploration Direction, Elf Aquitaine, CSTJF, 64018 Pau cedex, France
Bitumen samples have been chosen either from natural oil seepages and outcropping oil-stained reservoirs or archaeological bitumens from excavations in Iraq and Pakistan. Asphaltenes have been extracted from the bitumens. X-ray absorption near edge fine structure (XANES) spectroscopy at the S L-edge and K-edge has been employed to follow the oxidation effects on various sulphur moieties of the asphaltene fractions. Among asphaltenes extracted from archeological bitumens, sulphoxide, sulphone and sulphate are the predominant oxidized forms of sulphur.
© EDP Sciences 1997