Simultaneous removal of SO2 and NO by FeII(EDTA) solution: promotion of Mn powder and mechanism of reduction
2019
Duo, Yankai | Wang, Xiaoping | He, Jinjia | Zhang, Shihan | Pan, Hua | Chen, Jianmeng | Chen, Jun
The effect of Mn powder addition on the simultaneous removal of SO₂ and NO coupled with Feᴵᴵ(EDTA) absorption was investigated in this work. In the NO absorption system with Feᴵᴵ(EDTA), SO₂ reduced Feᴵᴵ(EDTA)-NO to Feᴵᴵ(EDTA) with a reduction efficiency reaching 88.5% under the conditions of 4000 mg/m³ SO₂, pH 8.0, 44 °C, and the flow rate of 1.2 L/min within 60 min. Introducing 0.1 M Mn powder with SO₂ increased the Feᴵᴵ(EDTA)-NO reduction efficiency to 96.8% within 5 min. SO₂ was also removed by reducing Feᴵᴵ(EDTA)-NO and converted into SO₄²⁻ at a removal efficiency of 100%. After adding Mn powder, NO was removed through the following reaction: [Formula: see text]. Mn powder functioned as a reductant to regenerate the absorption of solution, and the coordinated NO in Feᴵᴵ(EDTA)-NO was reduced to NH₄⁺. The resource utilization rate of N reached approximately 77.2%. The integrated technology is a potential solution for flue gas treatment in industrial sectors with coal-fired power plants and industrial boiler. Graphical abstract
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