Influence of Particle Surface Area Concentration on the Production of Organic Particulate Matter in a Continuously Mixed Flow Reactor
Influence of Particle Surface Area Concentration on the Production of Organic Particulate Matter in a Continuously Mixed Flow Reactor
复制标题
连续混流反应器中颗粒表面积浓度对有机颗粒物生产的影响
DOI：
10.1021/acs.est.8b07302
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发表时间：
2019
影响因子：
11.4
通讯作者：
Martin, Scot T.
中科院分区：
文献类型：
--
作者：
Han, Yuemei;Gong, Zhaoheng;Liu, Pengfei;de Sá, Suzane S.;McKinney, Karena A.;Martin, Scot T.
在连续混流反应器 (CMFR) 中产生不同颗粒表面积浓度的有机颗粒物 (PM)。当S从0.55增加到2.87×103μm2·表面cm-3·体积时，α-蒎烯暗臭氧分解的表观PM产量从24.5±0.7％增加到57.1±0.6％。 S> 2.1 × 103μm2cm–3 时表观产率饱和。与减少S相比，增加实验的表观产率存在滞后现象。气体-粒子相互作用、气体-壁相互作用以及粒子-壁交叉相互作用的相对时间尺度可以解释这些结果。随着S的增加，PM碳氧化态和氧碳原子比分别从-0.19下降到-0.47和0.62到0.51，这表明半挥发性有机物质更多地分配到PM中有助于增加PM产量。彻底了解气壁相互作用对 PM 表观产量的作用对于将实验室结果扩展到大气 PM 产量的预测至关重要，而 CMFR 和间歇式反应器的比较结果在这方面可以提供丰富的信息。
Organic particulate matter (PM) was produced at different particle surface area concentrationsSin a continuously mixed flow reactor (CMFR). The apparent PM yield from the dark ozonolysis of α-pinene increased from 24.5 ± 0.7% to 57.1 ± 0.6% for an increase inSfrom 0.55 to 2.87 × 103μm2·surface cm–3·volume. The apparent yield saturated forS> 2.1 × 103μm2cm–3. There was hysteresis in the apparent yield for experiments of increasing compared to decreasingS. The relative timescales of gas-particle interactions, gas-wall interactions, and thereby particle-wall cross interactions could explain the results. The PM carbon oxidation state and oxygen-to-carbon atomic ratio decreased from −0.19 to −0.47 and 0.62 to 0.51, respectively, for increasingS, suggesting that greater partitioning of semivolatile organic species into the PM contributed to the increased PM yield. A thorough understanding of the role of gas-wall interactions on apparent PM yield is essential for the extension of laboratory results into predictions of atmospheric PM production, and comparative results from CMFRs and batch reactors can be informative in this regard.