Novel MnWOx catalyst with remarkable performance for low temperature NH3-SCR of NOx

A novel W promoted MnOx catalyst (MnWOx) was used for the selective catalytic reduction (SCR) of NOx with NH3 at low temperatures, with high deNOx efficiency from 60 to 250 °C under relatively high space velocity. The MnWOx catalyst showed a unique core–shell structure with Mn3O4 covered by Mn5O8 while Mn4+ species at the outer surface served as a real active phase for NH3-SCR. The W doping resulted in the smaller particle size of MnOx active phase, increased the surface acidity and facilitated the NO/NH3 oxidation, thus enhancing low temperature deNOx efficiency by promoting both Langmuir–Hinshelwood and Eley–Rideal reaction pathways. This novel catalyst is promising to be used in the deNOx process for flue gas after dust removal and desulfurization.