【摘要】 采用水热晶化法一步制备了RhCeZrLaNdO_x系列催化剂,测定其比表面积、储氧量和还原温度等性能参数,并进行结构和形貌表征,研究了制备过程中水热晶化温度和时间、表面活性剂等条件对催化剂性能、结构和形貌的影响。结果表明,以月桂酸作为表面活性剂,在160℃水热晶化4h制备的催化剂具有较大的比表面积、较高的储氧量和较低的还原温度,微观结构为四方相的固溶体纳米颗粒。与传统浸渍法制备的Rh/CeZrLaNdO_x催化剂比较,水热晶化法制备的催化剂对CO还原NO具有更好的低温催化活性。更多还原

【Abstract】 A series of RhCeZrLaNdO_x catalysts were prepared by one-step hydrothermal crystallization method. The influence of hydrothermal crystallization time, temperature and the type of surfactant on physical and chemical properties of the catalysts was investigated by evaluating their specific surface area, oxygen storage capacity and reduction temperature. The results showed that the catalysts prepared at 160°C hydrothermal crystallization for 4 h and the lauric acid as surfactant had larger specific surface area, low reduction temperature, high oxygen storage capacity. The microstructure of the catalyst is solid solution nanoparticles with tetragonal phase. The catalytic activity of RhCeZrLaNdO_x for CO and NO was better than that of the traditional Rh/CeZrLaNdO_x catalysts.更多还原