【Abstract】 The 4% Ni-Al₂O₃catalysts prepared by coprecipitation method calcined at different temperature was tested by propane selective catalytic reduction of nitric oxide（NO） in excess oxygen.Catalyst calcined at 550 ℃ showed the highest activity for selective catalytic reduction of NO and the NO conversion was approached to 100 % at 500 ℃.The Ni-Al₂O₃ catalyst was characterized by XRD,temperature-programmed reduction with H₂(H₂-TPR) and BET techniques.Based on the characterization results,with the increase of calcinations temperature,NiO gradually changes to the surface aluminate phase containing highly dispersed nickel metal cations in Al₂O₃ matrix,which was responsible for the high activity of catalyst calcined at 550 ℃.At higher calcination temperature,the decrease of surface areas results in the decrease of the activities of the catalyst for NO selective catalytic reduction by propane.更多还原