Experimental and Kinetic Study of the Interaction of a Commercial Soot with NO at High Temperature

Abstract

An experimental and kinetic study at high temperature was made of the interaction of NO with Printex-U, a commercial carbon black, considered as diesel soot model compound. Foremost, a characterization of this soot was performed by using different techniques such as elemental analysis, BET surface area analysis, SEM, TEM, and XRD. Two series of experiments were carried out. The first one took into account the inlet NO concentration influence (from 200 to 2000 ppm) at a given temperature of 1273 K. In the second one, the temperature influence (from 1173 to 1373 K) at a given NO concentration of 2000 ppm was considered. From the experimental results, a strong effect of the inlet NO concentration and temperature was observed. A kinetic model, the shrinking core model with decreasing size particle and chemical reaction control, was successfully applied, obtaining a fractional reaction order of 0.26 with respect to NO and activation energy of 110 kJ/mol.