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无机材料学报

无机材料学报

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纳米γ-MnO_2薄膜制备及其催化性能研究

赵丽丽1 王榕树2   

  1. 1. 学院上海硅酸盐研究所特种无机材料研究发展中心, 上海 200050; 2. 天津大学化工学院, 天津 300072
  • 收稿日期:2003-03-03 修回日期:2003-04-21 出版日期:2004-03-20 网络出版日期:2004-03-20

Preparation of 7-MnO2 Thin Film and Its Catalytic Property

ZHAO Li-Li1 WANG Rong-Shu2   

  1. Research and Development Center for Special Inorganic Materials of Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China; School of Chemical Engineering and Technology; Tianjin University; Tianjin 300072; China
  • Received:2003-03-03 Revised:2003-04-21 Published:2004-03-20 Online:2004-03-20

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摘要： 利用,γ-MnO2纳米粉体,通过悬浮粒子烧结法制备γ-MnO2薄膜.通过原子力显微镜、扫描电镜、BET比表面积测量及X射衍射等技术对薄膜结构进行了表征,并考察了La、PVA添加剂及pH调节对薄膜结构的影响.另外,通过H2-TPR技术比较了γ-MnO2纳米粉体与γ-MnO2薄膜的催化性能.结果表明:当La/Mn=0.15,La助剂对薄膜的稳定作用最佳;当浸涂液pH=10、PVA/γ-MNO2=7％,薄膜表面不易产生裂纹;γ-MnO2薄膜比γ-MnO2粉体的还原过程稍难、氧中心活性略低.

关键词: γ-MnO2, 薄膜, 添加剂, 催化性能

Abstract: A γ-MnO2 thin film was prepared using nano-sized γ-MnO2 powder by the suspending
particles sintering method. The γ-MnO2 thin film was characterized by AFM, SEM, BET and XRD techniques, and the effects of La, PVA additives and pH value on the
structure of γ-MnO2 thin film were examined. In additim, catalytic properties of γ-MnO2 thin film and γ-MnO2 nanometer
powder were compared by H2-TPR technique. The results show that La can efficiently suppress the phase transformation of γ-MnO2 thin film at La/Mn=0.15,
there are no cracks on the surface of γ-MnO2 thin film dipped at pH=10 and PVA/γ-MnO2=7%, and the activity of oxygen center of
γ-MnO2 thin film is slightly lower than that of γ-MnO2 nanometer powder.

Key words: γ-MnO2, thin film, additives, catalytic property

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