| Summary: | Nitrogen dioxide (N<sub>2</sub>O) is a greenhouse gas that is harmful to the ozone layer and contributes to global warming. Many other nitrogen oxide emissions are controlled using the selective non-catalytic reaction (SNCR) process, but N<sub>2</sub>O reduction methods are few. To avoid future air pollution problems, N<sub>2</sub>O reduction from industrial sources is essential. In this study, a N<sub>2</sub>O decomposition and NO formation under an argon atmospheric N<sub>2</sub>O gas mixture were observed in a lab-scale SNCR system. The reaction rate and mechanism of N<sub>2</sub>O were calculated using a reaction path analyzer (CHEMKIN-PRO). The residence time of the gas mixture and the temperature in the reactor were set as experimental variables. The results confirmed that most of the N<sub>2</sub>O was converted to N<sub>2</sub> and NO. The change in the N<sub>2</sub>O reduction rate increased with the residence time at 1013 and 1113 K, but decreased at 1213 K due to the inverse reaction. NO concentration increased with the residence time at 1013 and 1113 K, but decreased at 1213 K owing to the conversion of NO back to N<sub>2</sub>O.
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