Abstract: An alumina supported Pd-ZrO₂ catalyst with high surface area was synthesized by impregnation method and characterized byBET, XRD and TEM techniques. The catalytic activity of the catalyst onselective 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 had been dispersed evenly on the Al₂O₃support, and a dding withfter appropriate amount of ZrO₂ addition, the obtained compound catalyst 1 wt％Pd-2 wt％ZrO₂/Al₂O₃showed high catalytic activity on NO selective catalytic reduction reaction,and the NO conversion could reached 50 wt %-70 wt% in the temperature range of 240-250℃. The improvement of NO conversion is ascribed to the ZrO₂ loaded on the catalysts, which can The ZrO₂loaded on the catalysts could promote the adsorption of NO and C₃H₆on the catalyst surface, a synergetic catalytic effect between Pd and ZrO₂has been proposed. .

Key words: selectivecatalyst reduction (SCR), C₃H₆, NO conversion, ZrO₂