Reduction of Nitric Oxides by Hydrocarbon

概要

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The reaction of nitric oxides with methane, ethane, propane and n-butane was investigated in the heating temperature range 900-1100°C using a tubular flow reactor. In one-stage reaction, the conversion of NOx was accelerated at air ratio below 1.0 and the per-cent of conversion of NOx to HCN increased with the decrease of air ratio. The intermediate products were oxidized by adding secondary oxygen and by reheating. They were oxidized completely at reheating temperature above 1100°C and at residual oxygen concentration above 0.5‰. It was sug-gested that both NO regeneration and N2 production were taking place on oxidation of HCN. The ratio of NO regeneration increased at higher oxygen and lower NOx concentration, and the percent of NOx reduction in two-stage reaction decreased. Propane and n-butane showed higher percent of NOx conversion and reduction than methane and ethane at high primary air ratio. The percent of NOx con-version increased with the increase of concentration of hydrocarbon. The maximum percent of NOx reduction was obtained at concentrations of propane 0.33-0.67‰ or n-butane 0.25-0.5‰. The ef-fect of first-stage temperature, gas flow rate, CO2, SO2 and H2O was also investigated.
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