Chemical characterization of size-selected nanoparticles emitted by a gasoline direct injection engine: Impact of a catalytic stripper
Chemical characterization of size-selected nanoparticles emitted by a gasoline direct injection engine: Impact of a catalytic stripper
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DOI：
10.1016/j.fuel.2021.120317
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发表时间：
2021-03-08
期刊：
影响因子：
7.4
通讯作者：
Focsa, Cristian
中科院分区：
文献类型：
--
作者：
Duca, Dumitru;Rahman, Mostafiz;Focsa, Cristian
将激光解吸电离质谱仪(L2MS)和先进的统计技术相结合，揭示了催化汽提塔(CS)对汽油直喷发动机排气化学成分(分子水平)的影响，并跟踪了整个颗粒尺寸范围(10？560 nm)内与尺寸相关的化学特性的演变。组成废气的气相和多分散颗粒在不同的底物上使用自制的双过滤系统进行分离和采样，而尺寸选定的颗粒则使用串级冲击器收集并分离到13个不同尺寸的槽中(最小直径10？18 nm)。我们证明，对废气颗粒物进行精细的分子水平表征对于评估CS的效果是必要的，特别是对于携带最大挥发性成分的最小超细颗粒。
This work combines laser desorption/ionization mass spectrometry (L2MS) and advanced statistical techniques to reveal the impact of a catalytic stripper (CS) on the chemical composition (at the molecular level) of a gasoline direct injection engine exhaust, and follow the evolution of size-dependent chemical characteristics over the whole particles size range (10?560 nm). The gas phase and polydisperse particles making up the exhaust are separated and sampled on distinct substrates using an original homebuilt two-filter system, while size-selected particles are collected using a cascade impactor and separated into 13 different size bins (smallest diameters 10?18 nm). We demonstrate that a fine molecular-level characterization of the exhaust particulate matter is necessary to assess the effect of the CS, especially for the smallest ultra-fine particles carrying the largest volatile fraction.