Selective Catalytic Reduction of NO with Propylene over Pd-ZrO2/Al2O3 Catalysts

An alumina supported Pd-ZrO2 catalyst with high surface area was synthesized by impregnation method and characterized by BET, XRD and TEM techniques. The catalytic activity of the catalyst on selective catalytic reduction (SCR) of NO with C3H6 as reducer was studied, and the influence of the reaction temperature, catalyst component, calcination temperature, reactant ratio and space velocity on the catalytic activity were investigated, respectively. The results indicated that the Pd nano-particles dispersed evenly on the Al2O3 support, and adding with appropriate amount of ZrO2, the obtained compound catalyst l wt%Pd-2wt%ZrO2/Al2O3 showed high catalytic activity on NO selective catalytic reduction reaction, and the NO conversion could reach 50wtgo-70wt% in the temperature range of 240-250 degrees C. The improvement of NO conversion is ascribed to the ZrO2 loaded on the catalysts, which can promote the adsorption of NO and C3H6 on the catalyst surface, a synergetic catalytic effect between Pd and ZrO2.