EELS AND HRTEM OF ETHYLENE SOOT

Soot nanostructure was analyzed in fuel-rich premixed laminar C2H4/O2 flames at a constant C/O ratio of 0.8 and different maximum temperatures, namely 1620K and 1690K, obtained using different cold gas velocity. Bulk properties of soot as H/C ratio and reactivity were investigated, along with morphological, nanostructural and chemical features (using TEM, HRTEM, EELS). It was found that dehydrogenation and aromatization of soot occurring along the flames, are favoured at higher flame temperatures. Nevertheless, soot from the two flames reach a final nanostructure rather similar, independently on the temperature conditions at least in the 1620-1690K range.