【摘要】 采用水热晶化法一步制备了铈锆摩尔比不同的PtCe_xZr_1-xO₂系列催化剂,测定其比表面积、储氧量、氢气还原温度等物化性能参数,并进行结构表征,研究催化剂组成中铈锆摩尔比(n_Ce/n_Zr)对催化剂结构和性能的影响。结果表明,当n_Ce/n_Zr=5:5时,制备得到的PtCe_0.5Zr_0.5O₂催化剂晶粒尺寸最小,储氧量较高,氢气还原温度低,微观结构为四方相和立方相2种晶型结构并存的固溶体。与传统贵金属浸渍负载方法制备的Pt/Ce_0.5Zr_0.5O₂催化剂相比较,水热晶化法一步制备的PtCe_0.5Zr_0.5O₂催化剂对碳烟的低温氧化具有更优的催化活性。更多还原

【Abstract】 A series of PtCe_xZr_1-xO₂ catalysts were prepared by one-step hydrothermal crystallization method.The influences of the molar rate of Ce and Zr(n_Ce/n_Zr) on physical and chemical properties of the catalysts were investigated by specific surface area,oxygen storage capacity,reduction temperature test and X-ray diffractometer methods.The results showed that the catalyst with a ratio of n_Ce/n_Zr=5:5 had the smallest grain size,higher oxygen storage capacity,lower reduction temperature,and that the microstructure was solid solution nanoparticles with tetragonal and cubic phases.Compared with the Pt/Ce_0.5Zr_0.5O₂ catalyst prepared by a traditional method,the PtCe_0.5Zr_0.5O₂ catalyst prepared by one-step hydrothermal crystallization method had better catalytic activity for soot low-temperature oxidation.更多还原