Heterogeneous reactions of NO2 on NaCl and Al2O3 particles
| Autor: | T. M. Miller, V. H. Grassian, A. L. Goodman |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
inorganic chemicals
Chemistry Sodium Inorganic chemistry Analytical chemistry chemistry.chemical_element Infrared spectroscopy Surfaces and Interfaces respiratory system Condensed Matter Physics complex mixtures respiratory tract diseases Surfaces Coatings and Films chemistry.chemical_compound Adsorption Nitrate Atmospheric chemistry Diffuse reflection Nitrite Spectroscopy |
| Zdroj: | Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 16:2585-2590 |
| ISSN: | 1520-8559 0734-2101 |
| DOI: | 10.1116/1.581386 |
| Popis: | In this study, heterogeneous reactions of NO2 on NaCl and Al2O3 particles, two different types of particles present in the Earth’s atmosphere, are compared. Transmission Fourier-transform infrared spectroscopy and diffuse reflectance UV/Vis spectroscopy are used to characterize gas-phase and adsorbed products following reaction with NO2. For Al2O3 particles, two adsorbed species have been identified. At low NO2 pressures, adsorbed nitrite is formed whereas at higher NO2 pressures, nitrate is present on the surface of the aluminum oxide particles. For NaCl particles, adsorbed nitrate forms at all NO2 pressures. Kinetic measurements show that nitrate formation on sodium chloride is second order in NO2 pressure, in agreement with previous studies, whereas nitrate formation on aluminum oxide is first order in NO2 pressure. The potential importance of heterogeneous reactions of NO2 with these particles in the atmosphere is discussed. |
| Databáze: | OpenAIRE |
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