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化学学报
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化学学报 ›› 2011, Vol. 69 ›› Issue (20): 2445-2456. 上一篇    下一篇

研究论文

Pt/MnO2纳米结构催化剂的制备与结构表征

于学华1,2，贺军辉*,1，胡玉才2，田华1，周丽1,2   

  1. (1中国科学院理化技术研究所 功能纳米材料实验室 北京 100190)
    (2鲁东大学化学与材料科学学院 烟台 264025)
  • 投稿日期:2011-06-04 修回日期:2011-06-23 发布日期:2011-06-30
  • 通讯作者: 贺军辉 E-mail:jhhe@mail.ipc.ac.cn
  • 基金资助:

    国家自然科学基金;国家自然科学基金委员会—中国工程物理研究院联合基金

Preparation and Structural Characterization of Pt/MnO2 Nanostructured Catalysts

Yu Xuehua1,2 He Junhui*,1 Hu Yucai2 Tian Hua1 Zhou Li1,2   

  1. (1 Functional Nanomaterials Laboratory, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190)
    (2 School of Chemistry and Materials Science, Ludong University, Yantai 264025)
  • Received:2011-06-04 Revised:2011-06-23 Published:2011-06-30
  • Contact: Junhui He E-mail:jhhe@mail.ipc.ac.cn

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采用一种简单的方法合成了Pt/MnO2纳米结构催化剂. 通过改变还原时间、反应温度、聚乙烯吡咯烷酮(PVP)的用量、Pt负载量等, 研究了反应条件对Pt/MnO2纳米结构催化剂的Pt纳米粒子的粒径大小、粒径分布和分散性影响. 并在最佳条件下合成一系列不同载体和Pt负载量的Pt/MnO2纳米结构催化剂. 通过X射线衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)等对合成的MnO2载体和Pt/MnO2催化剂进行了表征. 结果表明: 当还原时间为1 h、反应温度为80 ℃, PVP的用量为n(PVP)∶n(Pt)＝20∶1时, 负载的Pt纳米粒子具有较小的粒径而且能够在MnO2载体上均匀分散, Pt纳米粒子的粒径随负载量的增加先变小后增大. 负载过程对载体的形貌和晶型没有显著的影响, 载体不同对Pt纳米粒子的粒径没有影响, 但对纳米粒子的分布密度有一定影响.

关键词: Pt纳米粒子, 粒径, MnO2载体, Pt/MnO2纳米结构催化剂

Pt/MnO2 nanostructured catalysts were synthesized by a facile method. Effects of reaction conditions on the particle size, size distribution and dispersity of Pt nanoparticles were studied by changing the reduction time, the reaction temperature, the amount of polyvinylpyrrolidone (PVP) and the loading amount of Pt. A series of Pt/MnO2 nanostructured catalysts with different MnO2 supports and Pt loadings were synthesized under optimal conditions. The as-prepared MnO2 supports and Pt/MnO2 nanostructured catalysts were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Experimental results showed that Pt nanoparticles of small size and high dispersion were obtained on the MnO2 supports when the reduction time, the reaction temperature, the amount of PVP was 1 h, 80 ℃, and n(PVP)∶n(Pt)＝20∶1, respectively. The particle size of Pt nanoparticles first increases, and then decreases with increase of the Pt loading. The loading process of Pt nanoparticles did not influence the crystal form and morphology of the MnO2 supports. The particle size of Pt nanoparticles was not influenced but the distribution density of Pt nanoparticles was influenced by varying MnO2 support.

Key words: Pt nanoparticle, particle size, MnO2 support, Pt/MnO2 nanostructured catalysts