The Behavior and Reactivity of Reactive Species in the Atmosphere

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(1) In order to coarify oxidation behavior of NO to NO_2 immediately after emission into the atmosphere, a chemical reaction model involving oxidation of NO_x and methane has been developed. Within the temperature rage of 500 to 700ﾟC,presence of CH_4 in exhaust gases causes promption of NO oxidation, which is affectd by CH_4, O_2 H_2O and CO concentrations and light intensity, and the conversion behavior of NO to no_2 in the vicinity of the emission duct cannot be ignored.(2) In order to clarify the formation mechanism for gas-phase smoke radicals from the combustion of polymers, the influence of combustion conditions on the products from the combustion of polypropylene and poly (methyl methacrylate) has been studied using gas chromatography. A correlation between oxygen-containing products, such as an acetone, and gas-phase smoke radicals was shown. Gas-phase smoke radicals were detected from the combustion of acetone. This suggests that the meta-stable compounds such as a trioxide, that could decompose to form radicals might be produced from the combustion of oxygen-containing compounds.(3) In order to clarify the decrease of cysteamine caused by gas-phase smoke from combustion of polymers, the effect of inhibitors was investigated. Ascorbic acid showed inhibitory effect for the oxidation of cysteamine and ascorbic radical was detected. This implied the inclusion of gas-phase smoke radicals for the cysteamine oxidation.