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Composition of Semi-volatile Particles from Diesel Exhaust
Technical Paper
2005-01-0197
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Vehicle exhaust particles from diesel passenger vehicles were studied in terms of volatility and chemical composition. Condensation of semi-volatile compounds leads to particle growth during exhaust dilution and cooling. The particle growth was observed to be particle surface related. At higher vehicle speed and load some of the semi-volatile material forms nucleation particles that are dominating the particle number concentration. The nucleation mode is completely volatile at 180°C and consists mainly of sulfate. The amount of organic material is smaller. The organics/sulfate ratio is larger for the soot mode indicating an earlier condensation process of organics before they are incorporated in the nucleation process. Under typical atmospheric dilution conditions most of the semi-volatile material is present in the soot mode. The semi-volatile material evaporates at temperature between 130°C and 180°C. Thermal treatment using a thermodenuder enables complete evaporation of the nucleation particles, however not all material from the soot particles is removed.
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Authors
- Volker Scheer - Ford Forschungszentrum Aachen
- Ulf Kirchner - Ford Forschungszentrum Aachen
- Roberto Casati - Ford Forschungszentrum Aachen
- Rainer Vogt - Ford Forschungszentrum Aachen
- Birgit Wehner - Institute for Tropospheric Research
- Sabine Philippin - Institute for Tropospheric Research
- Alfred Wiedensohler - Institute for Tropospheric Research
- Nele Hock - Max-Planck-Institute for Chemistry
- Johannes Schneider - Max-Planck-Institute for Chemistry
- Silke Weimer - Max-Planck-Institute for Chemistry
- Stephan Borrmann - Max-Planck-Institute for Chemistry
Citation
Scheer, V., Kirchner, U., Casati, R., Vogt, R. et al., "Composition of Semi-volatile Particles from Diesel Exhaust," SAE Technical Paper 2005-01-0197, 2005, https://doi.org/10.4271/2005-01-0197.Also In
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