Recyclable MFe2O4 (M = Mn, Zn, Cu, Ni, Co) coupled micro–nano bubbles for simultaneous catalytic oxidation to remove NOx and SO2 in flue gas. Issue 42 (2nd July 2020) - Sun, Hongrui
Abstract : NO x -SO2 -MFe2 O4 -micro–nano bubbles system for NO x removal. Abstract : NO x can be efficiently removed by micro–nano bubbles coupling with Fe 3+ and Mn 2+, but the catalyst cannot be reused and the adsorption wastewater should be treated. This work developed a new technology that uses micro–nano bubbles and recyclable MFe2 O4 to simultaneously remove NO x and SO2 from flue gas, and clarified the effectiveness and reaction mechanism. MFe2 O4 (M = Mn, Zn, Cu, Ni and Co) prepared by a hydrothermal method was characterized. The results show that MFe2 O4 can be activated to produce ˙OH which can accelerate the oxidation absorption of NO x . Compared with no catalyst, the NO x conversion rate increased from 32.85% to 83.88% in the NO x –SO2 –MFe2 O4 -micro–nano bubble system, while the removal rate of SO2 can reach 100% at room temperature. The catalytic activities of MFe2 O4 showed the following trend: CuFe2 O4 > ZnFe2 O4 > MnFe2 O4 > CoFe2 O4 > NiFe2 O4 . The results provide a new idea for the application of advanced oxidation processes in flue gas treatment.