XAFS spectroscopy results for PM samples from residual fuel oil combustion
X-ray absorption fine structure (XAFS) spectroscopy data were obtained from a series of particulate samples produced by the combustion of residual fuel oil in a 732 kW fire-tube boiler at EPA's National Risk Management Research Laboratory in Research Triangle Park. Residual oil flyash (ROFA) samples from four oils of varying sulfur content were aerodynamically separated into <2.5 {micro}m and >2.5 {micro}m fractions using a cyclone. Spectra were obtained at the sulfur (S), vanadium (V), nickel (Ni), iron (Fe), zinc (Zn), and arsenic (As) K-shell photoelectric X-ray absorption threshold energy (K-edges). Preliminary analyses have been carried out on the S, V, and Ni X-ray absorption near edge structure (XANES) spectra. Deconvolution of the S XANES reveals that the dominant molecular forms of sulfur observed are sulfate and thiophenic sulfur. Sulfate was greater in the <2.5 {micro}m samples than in the >2.5 {micro}m samples, possibly reflecting the different mechanisms influencing the formation of large and small particles. Inorganic sulfides and elemental sulfur were present in lower percentages. The Ni XANES spectra from all of the ROFA PM samples agree fairly well with that of NiSO{sub 4}, while the V spectra most closely resemble the spectrum of vanadyl sulfate (VOSO{sub 4}.xH{sub 2}O).
- Research Organization:
- Univ. of Kentucky, Lexington, KY (US)
- DOE Contract Number:
- AC26-99BC15220
- OSTI ID:
- 20082305
- Resource Relation:
- Conference: Sixteenth Annual International Pittsburgh Coal Conference, Pittsburgh, PA (US), 10/11/1999--10/15/1999; Other Information: 1 CD-ROM. Operating systems required: Windows 95/98; Windows 3.X, Macintosh; PBD: 1999; Related Information: In: Sixteenth annual international Pittsburgh Coal Conference: Proceedings, [2000] pages.
- Country of Publication:
- United States
- Language:
- English
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