Chemical and Physical Properties of Ultrafine Diesel Exhaust Particles Sampled Downstream of a Catalytic Trap
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- 作者：Melissa Grose ; Hiromu Sakurai ; Jake Savstrom ; Mark R. Stolzenburg ; Winthrop F. Watts ; Jr. ; Christopher G. Morgan ; Ian P. Murray ; Martyn V. Twigg ; David B. Kittelson ; Peter H. McMurry
- 刊名：Environmental Science & Technology
- 出版年：2006
- 出版时间：September 1, 2006
- 年：2006
- 卷：40
- 期：17
- 页码：5502 - 5507
- 全文大小：221K
- 年卷期：v.40,no.17(September 1, 2006)
- ISSN：1520-5851
文摘
The chemical and physical properties of exhaust particlesproduced by a Caterpillar 3176 C-12 heavy duty dieselengine equipped with a catalytic trap (CRT) are reported.The engine was operated at 600 Nm and 1500 rpm,using fuels containing 15 and 49 ppm sulfur. A two-stagedilution tunnel designed to simulate the reactions that occurwhen hot combustion products mix with cooler atmosphericair was used. Particle size distributions were measuredusing a scanning mobility particle sizer (SMPS) and nano-scanning mobility particle sizer (nano SMPS); a nano-micro-orifice uniform deposit impactor (nano MOUDI)collected size-resolved samples for gravimetric and chemicalanalysis. A nanometer tandem differential mobilityanalyzer (nano TDMA) was used to measure the volatilityand hygroscopicity of 4-15 nm particles. These measurements confirm that the particles consisted primarily of sulfates.