Abstract
AbstractThe effect of oxygen concentration on the catalytic reaction of NOx with soot over BaAl2O4 has been studied by Diffuse Reflectance Fourier Transform Infrared Spectroscopy (DRIFTS). The introduction of O2 into the NO flow can result in a reactant mixture of NO/NO2/O2. Increasing the O2 concentration from 2 % to 5 % in the NO‐containing flow promotes the formation of NO2 from the gas phase oxidation of NO. The reactant mixture with high O2/NO flow, allows for the formation of greater amounts of nitrate species than that with low O2/NO flow, which further promotes the reaction of soot with NOx and leads to a high conversion efficiency of NOx into N2 and N2O. In the absence of O2, N2O is not observed since the N2O produced at high temperatures has reacted with soot before it can be detected.
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