The Behavior and Reactivity of Reactive Species in the Atmosphere

(1)为了验证NO在排放到大气后立即氧化为NO_2的行为，建立了NO_x与甲烷氧化的化学反应模型。在500 ~ 700ºC的温度范围内，废气中CH_4的存在促进了NO的氧化，而NO的氧化受CH_4、O_2、H_2O和CO浓度及光照强度的影响，并且在排放管道附近NO向no_2的转化行为不可忽视。(2)为了弄清聚合物燃烧气相烟自由基的形成机理，采用气相色谱法研究了燃烧条件对聚丙烯和聚甲基丙烯酸甲酯燃烧产物的影响。含氧产物（如丙酮）与气相烟雾自由基之间存在相关性。从丙酮的燃烧中检测到气相烟雾自由基。这表明，可以分解形成自由基的亚稳定化合物，如三氧化物，可能是由含氧化合物燃烧产生的。(3)为了弄清聚合物燃烧产生的气相烟雾导致半胱胺含量下降的原因，研究了抑制剂的作用。抗坏血酸对半胱胺的氧化有抑制作用，并检测到抗坏血酸自由基。这意味着在半胱胺氧化过程中含有气相烟雾自由基。

(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.