Flowerlike FeO_X-MnO_XAmorphous Oxides Anchored on PTFE/PPS Membrane for Efficient Dust Filtration and Low-Temperature No Reduction

The design and preparation of efficient catalytic membrane is the key to realizing dust filtration and denitration in one unit. Herein, flowerlike Mn_yFe_zO_xamorphous oxide catalysts were anchored on a PTFE/PPS membrane via hydrothermal methods. The uniform flowerlike structure has low gas resistance and can provide large surface area. The synergy effect between Fe and Mn species promotes the growth of Mn_yFe_zO_xcatalyst on PTFE/PPS membrane, and it is conducive to the improvement of the surface acidity and redox properties. Because of the largest surface area, as well as suitable redox property and surface acidity, the NO removal efficiency of Mn₄Fe₁O_x@PTFE/PPS catalytic membrane is always >90% at temperatures of 115-180 °C under a gas hourly space velocity (GHSV) of 74 »000 mL g^-1h^-1. The durable test results reveal that Mn₄Fe₁O_x@PTFE/PPS has excellent long-term stability and SO₂/H₂O resistance. Finally, dust filtration test results show that Mn₄Fe₁O_x@PTFE/PPS has good dust filtration performance under different conditions. Overall, the data obtained in this work suggest that the Mn₄Fe₁O_x@PTFE/PPS catalytic membrane has great application prospects in the simultaneous dust and NO purification of low-temperature flue gas. We expected that this work can shed some light on the design and preparation of catalytic membranes.