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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 42,
  • Issue 4,
  • pp. 674-680
  • (1988)

Reaction of Nitrogen Oxides with Black Carbon: An FT-IR Study

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Abstract

Qualitative and quantitative studies of the reaction of black carbon with the oxides of nitrogen, including NO, NO<sub>2</sub>/N<sub>2</sub>O<sub>4</sub>, N<sub>2</sub>O, and N<sub>2</sub>O<sub>3</sub>, have been carried out with the use of Fourier transform infrared spectroscopy (FT-IR). The active reactant is shown to be NO<sub>2</sub>, whether it acts as a disproportionation product or as an impurity in the gas under study. FT-IR spectra of the surface species identify them as resulting from reaction of carbon with NO<sub>2</sub>. For paraffin candle soot which was exposed simultaneously to oxygen atoms, and nitric oxide at 298 K, the surface species also are due to NO<sub>2</sub>, formed by oxidative adsorption of NO on the soot surface.

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