Gas-surface study of contaminant reactions in combustion. Covering the period: September 26, 1983-September 26, 1984
The interaction of SO/sub 2/ and NO with single-crystal surfaces of SiO/sub 2/ and Al/sub 2/O/sub 3/ at temperatures of 298, 473, and 673K, which were covered by various amounts of sodium and iron was studied using x-ray photoelectrons spectroscopy. The sodium was deposited on SiO/sub 2/ in the Na/sup +/ state, as indicated by an Auger parametric study. Scanning electron microscopy showed dramatic changes in surface morphology on SiO/sub 2/ after deposition of sodium. The amount of adsorbed SO/sub 2/ increased with increasing sodium deposition for both 298 and 473K. This adsorbed sulfur was identified as sulfite. Sticking probability calculations indicated that the reaction was a first-order or direct one-site adsorption. The initial sticking probability increased with increasing sodium coverage. When the SO/sub 2/ reaction was carried out at 473K, both the amount of adsorbed SO/sub 2/ and the initial sticking probability were higher than that at 298K. No reaction was observed at 673K. The iron was deposited on Al/sub 2/O/sub 3/ in Fe/sup 0/ state. At low coverages iron was partially oxidated due to its interaction with Al/sub 2/O. The amount of adsorbed NO increased with increasing iron coverage. However, at very high iron coverages, there was a decrease in adsorption. This indicated that the aluminium ions may be activating the iron atoms for NO adsorption. There was also an increase in adsorption with increasing temperature for high-iron coverages, but NO adsorption decreased for low-iron coverages. Sticking probability calculations indicated that the adsorption was mobile and dissociative. Binding energy of the nitrogen peaks indicated that NO was adsorbed onto the Fe/Al/sub 2/O/sub 3/ surface as a nitride. SO/sub 2/ interacted with both iron deposited on alumina and sodium deposited on alumina at 298, 473, and 673K. The adsorbed sulfur on Fe/Al/sub 2/O/sub 3/ was identified as sulfide and sulfate while on Na/Al/sub 2/O/sub 3/ it was identified as sulfite. 53 refs., 15 figs., 8 tabs.
- Research Organization:
- West Virginia Univ., Morgantown (USA). Dept. of Chemical Engineering
- DOE Contract Number:
- AT21-83MC20481
- OSTI ID:
- 5695324
- Report Number(s):
- DOE/MC/20481-1701; ON: DE85004569
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
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ALUMINIUM OXIDES
SORPTIVE PROPERTIES
COAL
COMBUSTION PRODUCTS
IRON
BINDING ENERGY
DEPOSITION
NITRIC OXIDE
ADSORPTION
SILICA
SODIUM COMPOUNDS
SULFUR DIOXIDE
CATIONS
EXPERIMENTAL DATA
HIGH TEMPERATURE
MEDIUM TEMPERATURE
PHOTOELECTRON SPECTROSCOPY
SCANNING ELECTRON MICROSCOPY
TEMPERATURE EFFECTS
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHARGED PARTICLES
DATA
ELECTRON MICROSCOPY
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY
ENERGY SOURCES
FOSSIL FUELS
FUELS
INFORMATION
IONS
MATERIALS
METALS
MICROSCOPY
MINERALS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SPECTROSCOPY
SULFUR COMPOUNDS
SULFUR OXIDES
SURFACE PROPERTIES
TRANSITION ELEMENTS
010800* - Coal
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