Abstract
Interactions of gaseous NO and SO/sub 2/ with Al/sub 2/O/sub 3/, SiO/sub 2/, and iron deposited on SiO/sub 2/ were carried out at temperatures 298, 473, and 673K. X-ray photoelectron spectroscopy (XPS) was used in the analysis. Pure Al/sub 2/O/sub 3/ and SiO/sub 2/ did not show any reaction with either NO or SO/sub 2/ at any of the three tenperatures. Iron was deposited on SiO/sub 2/ in the metallic state. Both gases interacted with the Fe/SiO/sub 2/ system. Interaction increased with increasing iron deposition. Two forms of nitrogen were observed when NO was exposed to the Fe/SiO/sub 2/ system at 298K. They were identified as nitride and molecularly adsorbed NO. At 473K, the amount of nitride increased while molecularly adsorbed NO was not observed. Neither form of nitrogen was observed at 673K. Two forms of sulfur, sulfate and sulfide, were observed at 298K on the SO/sub 2//Fe/SiO/sub 2/ system. At 473K, amount of sulfide increased while the amount of sulfate decreased. Neither form of sulfur was observed at 673K. 30 references, 9 figures, 11 tables.
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