Fabrication of the MnO2/PPS-SDBS catalytic filter material for low-temperature selective catalytic reduction of NO with NH3

Abstract

On the basis of the modification of sodium dodecylbenzene sulfonate (SDBS) and the redox reaction between KMnO₄ and manganese acetate, the MnO₂ active component was in situ decorated on the surface of polyphenylene sulfide (PPS) and used for low-temperature selective catalytic reduction of NO with NH₃. The microstructure and physicochemical properties of the as-prepared MnO₂/PPS-SDBS catalytic filter material were investigated by X-ray diffraction, field emission scanning electron microscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis, etc. The results indicated that the amorphous MnO₂ and some crystalline K₂Mn₄O₈ with nanoflower morphology were well dispersed and firmly attached on the surface of PPS fibers. Furthermore, MnO₂/PPS-SDBS possessed outstanding low temperature catalytic activity, and the NO_x conversions could reach 42.3–100% at 80–180 °C under optimal reaction conditions. Meanwhile, the catalytic filter material presented good air permeability and excellent cyclic and long-term stability due to the high dispersion of the active component and the surface modification of PPS with SDBS, which seems promising for simultaneous removal of NO_x and dust in practical applications.