Interaction of NO2 with Soot: Oxidation and Gasification at Temperatures Between 300 and 670 K

Abstract

Abstract In this study the interaction of NO2 with ethylene soot particles has been studied in a temperature from 300 to 670 K and NO2 concentrations ranging from 5 · 1010 molecules cm−3 to 5 · 1012 molecules cm−3. The adsorption of NO2 takes place in the whole temperature range studied with a mean initial uptake coefficient of (5.9±1.0) · 10−2 independent of temperature and gas phase concentration. At low temperatures HONO and NO are formed as gas phase products. At higher temperatures NO and CO2 have been observed as gaseous products indicating the oxidation and gasification of soot. For the NO and CO2 forming reaction an activation energy of EA = (44.7±8.2) · kJ mol−1 has been determined.