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In this study the interaction of NO 2  with ethylene soot particles has been studied in a temperature from 300 to 670 K and NO 2  concentrations ranging from 5 · 10 10  molecules cm −3  to 5 · 10 12  molecules cm −3 . The adsorption of NO 2  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 CO 2  have been observed as gaseous products indicating the oxidation and gasification of soot. For the NO and CO 2  forming reaction an activation energy of E A  = (44.7±8.2) · kJ mol −1  has been determined.

Interaction of NO 2 with Soot: Oxidation and Gasification at Temperatures Between 300 and 670 K