Reactivity and structure of soot generated at varying biofuel content and engine operating parameters

When following the structural change in the DPF during regeneration, a decreased structural order was observed in the beginning. After a certain time (ca. 40 s) a homogeneous oxidation of the soot takes place, which does not change the structure of the soot inside the DPF. This coincides with findings of a constant oxidation rate after a certain time. Overall, it can be ascertained that no graphitization of the soot takes place inside the DPF during regeneration.