采用水热法合成了棒状氢氧化镨，通过焙烧（400℃、4 h）将其转化为氧化镨。以氢氧化镨和氧化镨为载体，用沉积-沉淀法制备了相应的纳米金催化剂。通过比较两者在CO氧化中的催化行为发现，氢氧化镨负载的纳米金催化剂具有更高的催化活性。通过XRD、FT-IR和HRTEM等对催化剂进行表征，结果表明，氢氧化镨载体上增加的氢氧根基团与增加的催化活性直接相关。

Rod like praseodymium hydroxide is synthesized through a hydrothermal method and is partly transformed into praseodymium oxide after roasting at 400℃ for 4 h.Two kinds of supported Au catalysts are prepared by a deposition-precipitation method using praseodymium hydroxide and praseodymium oxide as supporter,respectively.Through comparing the catalytic behaviors of these two catalysts in CO oxidation,it is found that praseodymium hydroxide supported Au catalyst shows much higher catalytic activity than praseodymium oxide supported one.Characterization of the catalyst is performed by means of X-ray diffraction (XRD),Fourier transform infrared spectroscopy (FT-IR) and high-power transmission electron microscopy (HRTEM).The results show that the improved catalytic activity has a direct relation to the increased hydroxide group on praseodymium hydroxide.

李海莲(1992-),女,硕士研究生,研究方向为纳米金催化剂的制备及应用,lhl0423@126.com