Molecular Beam Studies of Environmental Gas-Liquid Reactions: The Removal of Gaseous Sulfur Dioxide by Molten Carbonates

我建议研究有毒气体与熔盐的碰撞和反应，重点研究二氧化硫（SO2）进入碳酸碱（CO2-3）熔体的反应性吸收。该项目将是首次使用表面敏感探针，即分子束散射，研究熔盐表面上工业和环境重要化合物的降解。我们试图回答以下问题：1)SO2是直接与CO2-3在熔体的最外层发生反应，还是必须深度溶解才能发生反应？2)高动能SO2分子能否像锤子一样，以弹道的方式穿透液体？3)熔体中H2O和O2-的存在对不同反应途径有何影响？这些问题解决了二氧化硫从废物流中去除的分子途径，并在基本水平上激发了对气体-离子液体反应的思考。希望这些研究将提供对熔体表面气体的化学和转移过程的理解，特别是那些对将有毒气体转化为良性气体很重要的过程。

I propose to investigate collisions and reactions of toxic gases with molten salts, focusing on the reactive uptake of sulfur dioxide (SO2) into alkali carbonate (CO2-3) melts. This project will be the first study of the degradation of an industrially and environmentally important compound at the surface of molten salts using a surface-sensitive probe, namely molecular beam scattering. We seek to answer the following questions: 1) Does SO2 react with CO2-3 directly within the outermost layers of the melt or must it dissolve deeply in order to react? 2) Can high kinetic energy SO2 molecules act like a hammer and ballistically penetrate into the liquid? 3) How does the presence of H2O and O2- in the melt influence the different reaction pathways? These questions address the molecular pathways by which SO2 is removed from waste streams, and they serve to stimulate thinking about gas-ionic liquid reactions at a basic level. It is hoped that these studies will provide an understanding of the chemistry and transfer processes of gases at the surface of melts, especially those important for the conversion of toxic gases to benign species.