On-line measurements of diesel nanoparticle composition and volatility
On-line measurements of diesel nanoparticle composition and volatility
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DOI：
10.1016/s1352-2310(02)01017-8
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发表时间：
2003-03
影响因子：
5
通讯作者：
H. Sakurai;H. Tobias;Kihong Park;D. Zarling;K. Docherty;D. Kittelson;P. Mcmurry;P. Ziemann
中科院分区：
文献类型：
--
作者：
H. Sakurai;H. Tobias;Kihong Park;D. Zarling;K. Docherty;D. Kittelson;P. Mcmurry;P. Ziemann
热解吸粒子束质谱仪（TDPBMS）和串联微分迁移率分析仪（TDMA）用于在线测量的化学成分和挥发性的纳米粒子和较大的颗粒从现代重型柴油发动机在轻，中负荷下运行在实验室条件下排放。温度依赖性TDPBMS质谱和使用光谱独特的油和合成费托燃料获得的质谱进行了分析，使用质谱匹配方法，以获得定量信息的贡献的燃料，油，氧化产物，和硫酸颗粒组成。TDMA测量的挥发性产生的纳米粒子的蒸气压，因此对有机成分的组成的信息。结果表明，对于这些操作条件，柴油纳米颗粒和较大颗粒的挥发性组分由至少95%的未燃烧润滑油组成。TDMA挥发性测量还检测到直径为几纳米的残留物质，这些物质可能是非挥发性核（烟灰、金属氧化物）或低挥发性有机化合物。这些在线分析为柴油纳米颗粒形成机制提供了新的见解。
A thermal desorption particle beam mass spectrometer (TDPBMS) and tandem differential mobility analyzers (TDMA) were used for on-line measurements of the chemical composition and volatility of nanoparticles and larger particles emitted from a modern, heavy-duty diesel engine operated at light and medium loads under laboratory conditions. Temperature-dependent TDPBMS mass spectra and mass spectra obtained using spectrally distinctive oil and synthetic Fischer–Tropsch fuel were analyzed using mass spectral matching methods to obtain quantitative information on the contributions of fuel, oil, oxidation products, and sulfuric acid to particle composition. TDMA measurements of volatility yielded information on nanoparticle vapor pressures and therefore on the composition of organic components. The results indicate that, for these operating conditions, the volatile component of both diesel nanoparticles and larger particles is comprised of at least 95% unburned lubricating oil. TDMA volatility measurements also detected residual species a few nanometers in diameter, which may be non-volatile cores (soot, metal oxide) or low-volatility organic compounds. These on-line analyses provide new insights into the mechanisms of diesel nanoparticle formation.