Efficient Inhibition of N₂O during NO Absorption Process Using a CuO and (NH₄)₂SO₃ Mixed Solution

The discovery of effective methods toward nitric oxide (NO) removal by solution is valuable for the cost-effective flue gas control. In this study, it is first reported that nitrous oxide (N₂O) is obviously suppressed by using copper oxide (CuO) combined with (NH₄)₂SO₃ (NS) solution. CuO has been characterized, and the effects of reactants concentration, additives, temperature, pH and powder size on NO absorption process have been evaluated. The selectivity of N₂O can drop from 91.30% to 11.25% under the optimum experimental conditions. Furthermore, based on the method of single-factor analysis, the inhibition of N₂O is identified as the coeffect of NS/CuO. In addition, the pathways of NO removal are divided into two partsN₂O formation and NO absorptionand its ratio is calculated in the range of 0.29–0.53. Because of the continuous supply of NS from ammonia desulfurization, this study opens the feasibility of simultaneous desulfurization and denitrification.