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中文摘要：
环境污染与防治问题全球瞩目，而一氧化氮作为最难消除的大气污染物之一，已日益受到世界各国的重视．金属氧化物催化剂是研究贫燃条件下烃类选择催化还原NO的一个重要方向。以氧化铝为载体的镍催化剂虽然表现出很高的活性，但是催化剂结构对NO转化活性的影响并未见详细报道．本文以共沉淀法制备4％Ni-Al2O3催化剂，利用XRD、TPR、BET等表征手段，着重考察了焙烧温度对Ni-Al2O3催化剂的物相结构及其对催化还原NO催化性能的影响．
英文摘要：
The 4% Ni-Al2O3 catalysts 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.
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