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

9629577保尔森烯烃是在对流层内形成氧化化合物的重要化学物种。在全球范围内，烯烃占非甲烷碳氢化合物排放的大部分，通过臭氧-烯烃化学反应产生的碳中，大约有一半是通过形成短暂的Criegee反应中间体来实现的。该奖项支持的研究有望为理解对流层臭氧-烯烃反应的机理做出重大贡献，特别是那些涉及生物烯与对流层臭氧发生光化学反应的反应。该项目使用特氟龙间歇反应器，结合GC/FID/MS、气相FTIR光谱和FTIR/基质分离分析技术，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。总体而言，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了解，从而有助于我们对空气污染和对流层化学的了解。自动柜员机-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