Ni-Al_2O_3催化剂上丙烷选择性还原NO  

Selective Reduction of Nitric Oxide by Propane over Ni-Al_2O_3 Catalysts

作　　者：张淑娟[1] 李兰冬[1] 章福祥[1] 薛斌[1] 关乃佳[1] 

机构地区：[1]南开大学化学学院新催化材料研究所,天津300071

出　　处：《催化学报》2005年第10期929-932,共4页

基　　金：国家自然科学基金重点项目(20233030);国家重点基础研究发展计划(973计划)项目(2003CB615801);霍英东教育基金(94016)资助

摘　　要：以机械混合法、浸渍法和共沉淀法分别制备了4%Ni-Al2O3催化剂,并用X射线衍射、程序升温还原、紫外-可见漫反射光谱和N2吸附等方法对催化剂的体相和表面结构进行了表征,系统考察了制备方法及焙烧温度对Ni-Al2O3催化剂催化丙烷选择性还原NO性能的影响.结果表明,Ni-Al2O3中存在NiO和NiAl2O4两种镍相,前者是丙烷氧化活性中心,后者是NO选择性催化还原的活性中心.共沉淀法制备的催化剂活性最好,550℃焙烧的Ni-Al2O3催化剂在反应温度为450和500℃时NO转化率接近100%.The selective catalytic reduction of nitric oxide （NO） by propane in excess oxygen was studied over 4 % Ni-Al2O3 catalysts prepared by three different methods： mechanical mixture, impregnation and coprecipitation. The catalysts were characterized by X-ray diffraction, temperature-programmed reduction, diffuse reflectance UV-Vis spectroscopy and N2 adsorption. The results show that the surface aluminate phase containing highly dispersed nickel metal cations in Al2O3 matrix is the active site for NO reduction, which is responsible for the high activity of the NAcp550 catalyst. The NiO phase is the active site for C3H8 oxidation by excess oxygen. The 4 % Ni-Al2O3 catalysts prepared by coprecipitation show the best performance for NO reduction, and the catalyst calcined at 550 ℃ gives the highest activity with the NO conversion of 100% at 450 and 500 ℃.

关 键 词：镍 氧化铝 一氧化氮 选择性催化还原 丙烷 

分 类 号：O643.32[理学—物理化学]