Publications in Scientific Journals:
J. Ofner, H. Grothe:
"A mechanistic study of the cooperative effect of NO2 and O2 on the soot surfaces";
Asian Chemistry Letters,
11
(2007),
1&2;
57
- 61.
English abstract:
Soot particles are emitted by Diesel engines and can be respired by the human lungs due to their small particle sizes. Particle filters, exhaust-gas recirculation systems and fuel additives are used to remove these particles from the exhaust gas stream. A low-maintenance possibility to avoid soot emissions are so-called continuous regenerating traps (CRT). In CRTs soot particles are oxidized to CO2 by the aid of the oxygen-containing exhaust gas constituents, i.e. NO2, O2 and H2O. Recent publications mention a cooperative effect between NO2 and O2 in the heterogeneous reaction on the soot surface. In the present study, we have applied temperature programmed oxidation (TPO-MS), temperature programmed desorption mass-spectroscopy (TPD-MS) and diffuse-reflectance-infrared-Fourier-transform-spectroscopy (DRIFTS) in order to investigate this effect in more detail. As a result new functional groups containing nitrates have been assigned on the soot surface, which were not detected within the reactions of the single gas components.
Created from the Publication Database of the Vienna University of Technology.