Unambiguous Identification of Key Molecular Species in Deposits Responsible for Increased Pollution from Internal Combustion Engines
Unambiguous Identification of Key Molecular Species in Deposits Responsible for Increased Pollution from Internal Combustion Engines
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DOI：
10.26434/chemrxiv.12666470.v1
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发表时间：
2020-07
期刊：
影响因子：
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通讯作者：
Max K. Edney;Joseph S. Lamb;M. Spanu;E. F. Smith;E. Steer;E. Wilmot;J. Reid;Jim Barker;
中科院分区：
文献类型：
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作者：
Max K. Edney;Joseph S. Lamb;M. Spanu;E. F. Smith;E. Steer;E. Wilmot;J. Reid;Jim Barker;
清洁和高效的内燃机性能将在向脱碳能源系统过渡的过程中发挥重要作用。目前，发动机部件上的燃料沉积对二氧化碳和污染物排放产生了负面影响，以前对沉积进行表征的尝试提供了非诊断性的化学分配。在这里，我们用3D OrbiSIMS技术揭示了汽油、柴油喷油器和过滤器沉积物中分子物种的同一性和三维空间分布。烷基苯磺酸盐是发动机燃料循环中润滑油污染的产物，在样品中很常见，我们证明了天然磺酸盐通过与汽油沉积物中的燃料碎片反应而转化为更长的链状物种。在这两种柴油沉积物中都发现了无机盐，它们普遍存在于喷油器沉积物深处。我们确定了C66H20以下常见的多环芳烃，这些化合物普遍存在于较低深度的汽油沉积物中。这项工作将通过解开它们的化学成分、空间分布和成因来缓解沉积物。
Clean and efficient internal combustion engine performance will play a significant role in the move to a decarbonized energy system. Currently, fuel deposit formation on engine components negatively impacts CO2 and pollutant emissions, where previous attempts at deposit characterization afforded non-diagnostic chemical assignments. Here, we uncover the identity and 3D spatial distribution of molecular species from gasoline, diesel injector and filter deposits with the 3D OrbiSIMS technique. Alkylbenzyl sulfonates, derived from lubricant oil contamination in the engine fuel cycle, were common to samples, we evidence transformation of the native sulfonate to longer chain species by reaction with fuel fragments in the gasoline deposit. Inorganic salts, identified in both diesel deposits, were prevalent throughout the injector deposits depth. We identified common polycyclic aromatic hydrocarbons up to C66H20, these were prevalent in the gasoline deposits lower depths. This work will enable deposit mitigation by unravelling their chemical composition, spatial distribution, and origins.