Mn-Ce-Nb-Ox/P84 catalytic filters prepared by a novel method for simultaneous removal of particulates and NO

Abstract

The Mn-Ce-Nb-Ox/P84 catalytic filter for removal of particulates and NO simultaneous was prepared by a novel method (foam coating method). The process parameters including the concentrations of PTFE emulsion, particle size of catalyst and calcination temperature for preparation of catalytic filters were analyzed. In addition, the physical properties and performance for removal of NO (NH3-SCR) and particulates of Mn-Ce-Nb-Ox/P84 catalytic filter prepared under the optimized parameters, were also systematic studied. Results show that the process parameters had significant influences on stability and performance of catalytic filter. The Mn-Ce-Nb-Ox/P84 catalytic filter prepared by foam coating method under the optimized parameters, has satisfactory physical properties and catalytic performance for removal of NO and particulates at 140–220 °C. The NO removal efficiency of catalytic filter can reach 95.3% at 200 °C as the catalyst loading amount is 450 g/m2. Moreover, the dust removal efficiency of Mn-Ce-Nb-Ox/P84 catalytic filter reaches as high as 99.98%, and the PM2.5 removal efficiency also reaches 99.98%. The anti-sulfur performance of Mn-Ce-Nb-Ox catalytic filter is also attractive, after injecting 150 ppm SO2, the NO removal efficiency still retains up to 85%. It is indicated that the foam coating method can not only make a bond of high strength between catalyst and filter, but also make the catalytic filter possessing an excellent and stable performance for removal of NO and particulates.