In order to solve the problem of NH₃ containing waste gas treatment from agricultural sources, this work investigates the selective catalytic oxidation (SCO) of NH₃ using plasma-coupled Cu-Mn/SAPO-34 catalyst under simulated actual operating conditions (low temperatures (<200 °C) under oxygen-rich conditions (20 vol.%)). The results indicate that 90% NH₃ conversion and 97% N₂ selectivity can be achieved at an energy density (ED) of 30 J/L.In situ diffuse reflectance infrared spectroscopy (DRIFTS) combined with optical emission spectroscopic diagnostics has been employed to elucidate the reaction mechanism of NH₃ conversion in the plasma-coupled catalyst. Plasma discharge leads to the direct dissociation of NH₃, and the NH/NH₂formed by the collision of NH₃ with electrons reacts with short-lived and long-lived active species generated by discharge, leading to the formation of NO_X. NO_X reacts with NH₃ in the gas phase to form NH₄NO₃, which then decomposes into N₂ on the catalyst surface. Under simulated actual operating conditions (160 °C with a high gaseous hourly space velocity and relative humidity), nearly 100% N₂ selectivity is achieved, demonstrating the great potential of this technology for practical application. This work successfully demonstrates an innovative NH₃-SCO process using a plasma-coupled catalyst under low-temperature and oxygen-rich conditions.
 

介质阻挡放电；催化剂；CuMn-SaPO34；选择性催化还原； 氨气