|Statement||edited by Jack G. Calvert.|
|Series||Acid precipitation series -- v. 3|
|Contributions||Calvert, Jack G.|
So2, No and No2 Oxidation Mechanisms — First published in Subjects Atmospheric chemistry, Aerosols, Environmental aspects, Sulphur dioxide, Nitrogen oxides, Atmospheric nitrogen oxides, Atmospheric sulphur dioxide, Sulfur dioxidePages: Additional Physical Format: Online version: SO₂, NO, and NO₂ oxidation mechanisms. Boston: Butterworth Publishers, © (OCoLC) Document Type. Calvert, J. G. (). SO₂, NO and NO₂ Oxidation Mechanisms: Atmospheric : by: The oxidation of SO 2 by O 3 was negligible and SO 2 had little influence on the oxidation of NO in the simultaneous oxidation of NO and SO 2. Finally, based on the in situ IR results, the oxidation mechanism is discussed and the reaction pathways are proposed.
Effects of NO"2 on oxidation mechanisms of atmospheric pollutant SO"2 over Baumberger sandstone [An article from: Building and Environment] [Y. Bai, G.E. Thompson, S. Martinez-Ramirez] on *FREE* shipping on qualifying offers. This digital document is a journal article from Building and Environment, published by Elsevier in. The article is delivered in HTML format and is available Author: Y. Bai, G.E. Thompson, S. Martinez-Ramirez. Kinetic studies of the HO-SO 2 reaction have been made using long-path Fourier transform infrared spectroscopy to follow the chemical changes in irradiated HONO, CO, SO 2, NO x, O 2 N 2 gaseous mixtures. The [HO], as monitored by the rate of CO 2 generation from the reaction HO + CO(+ O 2) → HO 2 + CO 2, is insensitive to the concentration of SO 2 in the mixture (0– ppm). The reaction is first order with respect to NO 2 and first-order with respect to CO. This is consistent with a single-step bimolecular mechanism and it is possible that this is the mechanism for this reaction at high temperatures. At temperatures below °C, the reaction is described by a rate law that is second order with respect to NO 2. s-2 2-+ n +5 o-2 3-→ n +2 o-2 + s 0 8 b) Identify and write out all redox couples in reaction. Identify which reactants are being oxidized (the oxidation number increases when it reacts) and which are being reduced (the oxidation number goes down).
There has been considerable debate regarding the mechanism for SO 2 oxidation. Here we show from field observations of a haze event that rapid oxidation of SO 2 by nitrogen dioxide (NO 2) and nitrous acid (HONO) takes place, the latter producing nitrous oxide (N 2 O). A proposed mechanism for the oxidation of SO 2 toSO 3 follows: NO 2 (g) + SO 2 (g) > NO(g) +SO 3 (g) 2 NO(g) + O 2 (g) > 2 NO 2 (g) Is this an example ofhomogeneous catalysis or heterogeneous catalysis? If so what is thecatalyst? There is no catalyst in thisreaction. The existence of NO 2 couldn't promote the formation of sulfate, because the direct oxidation of sulfite into sulfate by NO 2 is difficult (ΔE a = eV). However, coexisting NO 2 with O 2 can facilitate the oxidation of SO 2, which illustrates the micro-mechanism of the synergistic effect between SO 2 and NO 2 . Oxidation- Reduction Reactions Oxidation Numbers Types of Chemical Reactions Voltaic Cells Review Skills The presentation of information in this chapter assumes that you can already perform the tasks listed below. You can test your readiness to proceed by answering the Review Questions at the end of the chapter.