Low temperature selective catalytic reduction of NO with NH3 over Mn supported on Ce0.65Zr0.35O2 prepared by supercritical method: Effect of Mn precursors on NO reduction

Catalysts for low-temperature selective catalytic reduction were developed using Ce0.65Zr0.35O2 (CZO) generated via hydrothermal synthesis in supercritical water as the support. To evaluate the manganese precursors, which are known to have good de-NOx performance at low temperature, manganese acetate (MA) and manganese nitrate (MN) were impregnated on the CZO support. The developed catalysts were characterized using N2 adsorption–desorption, TGA, XRD, XPS and TPR. De-NOx experiments were carried out using a NOx analyzer to evaluate the performance of the developed catalysts. The MA-impregnated catalyst exhibited higher de-NOx efficiency than that impregnated with MN. This result was attributed to the difference in crystal phase and concentration of surface Mn and the resulting difference in the reducing ability.