A new experimental method was developed for conducting surface chemistry and extracting surface kinetic rates from mobility-area selected soot particles generated in flames and internal combustion engines. These mono-area particles were scrutinized for changes in surface area during a controlled high temperature oxidation (or condensation) using on-line nanoparticle characterization instrumentation. Quantitative kinetic information for surface oxidation rates can then be determined by changes in surface area. Results for soot sampled from a Santoro and Semerjian co-flow ethylene diffusion flame and sent to a differential mobility analyzer (DMA) to extract mono-area particles. For example, 122 nm mobility diameter particles were extracted from the DMA and passed with air through a heated flow tube. The resulting change in particle size for a residence time of 2.3 sec was shown as a function of oxidation temperature. A qualitiative analysis indicated that significant oxidation does not take place until 900°C, as demonstrated by the shift in the particle size distribution. The results are being used to ascertain the rate of soot oxidation as function of temperature, particle size, and fuel type. Original is an abstract.
|Original language||English (US)|
|Number of pages||1|
|Journal||International Symposium on Combustion Abstracts of Accepted Papers|
|State||Published - Jan 1 2000|
|Event||28th International Symposium on Combustion - Edinburgh, United Kingdom|
Duration: Jul 30 2000 → Aug 4 2000