Non-catalytic Oxidation of NO to NO2 by Addition of Dimethyl Ether
Junichi SATOU, Mitsuhiro OHTA, Makoto AKIYOSHI, Eiji OBATA
Oxidation characteristics of nitrogen monoxide (NO) to nitrogen dioxide (NO2) was studied by adding dimethyl ether to model combustion flue gases in a quartz flow reactor. The kinetic simulation model of CH3OCH3-NO-O2 system was used to investigate the mechanism of converting NO to NO2. The operating parameters are reaction temperature, the amount of DME (dimethyl ether) addition, and O2 concentration.
The oxidation of NO to NO2 by the addition of dimethyl ether occurred at the temperature range of 600-1050K in the presence of oxygen. The plots of percent of NO oxidation vs. reaction temperature indicate that there exist two optimum temperature ranges of 650-750K and 850-950K. The optimum peak at the lower temperature range (650-750K) was more susceptive to the amount of DME added and O2 concentration. However, at the highest DME amount and O2 concentration used, the NO oxidation percent was high all over the 650-950K range.
The results of the kinetic simulation show that the reaction paths of NO oxidation to NO2 by adding dimethyl ether at the low temperature range of 650-750K is different from those at the high temperature range of 850-950K.