Ozone Oxidation of Biogenic and Anthropogenic Alkenes: The Fate of the Criegee Intermediates

小行星9629577 烯烃是对流层内形成氧化性化合物的重要化学物种。 在全球范围内，烯烃构成了大部分非甲烷碳氢化合物排放，大约一半的碳通过臭氧-烯烃化学反应进行反应，形成了寿命短的Criegee反应中间体。 该奖项支持的研究有望为理解对流层臭氧-烯烃反应机制做出重大贡献，特别是涉及生物烯烃与对流层臭氧的光化学反应的研究。 该项目使用特氟隆间歇反应器，结合GC/FID/MS、气相傅里叶变换红外光谱和傅里叶变换红外光谱/基质隔离分析技术，研究臭氧-烯烃反应的动力学和机理。实验方法侧重于Criegee反应中间体的分解和反应途径。研究涉及Criegee中间体的化学反应机制对于理解控制对流层中氧化剂形成的过程具有重要的可能性。 总的来说，研究项目中描述的目标将大大提高我们对涉及烯烃的大气反应的理解，从而提高对空气污染和对流层化学的理解。 ATM-9629353

9629577 Paulson Alkenes are important chemical species for the formation of oxidizing compounds within the troposphere. On a global scale, alkenes comprise the majority of non-methane hydrocarbon emissions, and roughly half of the carbon that reacts through an ozone-alkene chemical reaction, does so by forming short-lived Criegee reaction intermediates. The research supported by this award is expected to make significant contributions to the understanding of the mechanism of ozone-alkene reactions in the troposphere, especially those involving photochemical reactions of biogenic alkenes with tropospheric ozone. The project examines the kinetics and mechanism of ozone-alkene reactions using Teflon batch reactors in conjunction with GC/FID/MS, gas phase FTIR spectroscopy and FTIR/matrix isolation analytical techniques. The experimental approach focuses on the decomposition and reaction pathways of Criegee reaction intermediates. Study of the chemical reaction mechnisms involving Criegee intermediates has important possibilities for understanding the processes that control the formation of oxidants in the troposphere. Overall, the goals described in the research project would lead to a significant improvement of our understanding of atmospheric reactions involving alkenes, and hence of air pollution and tropospheric chemistry. ATM-9629353