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.
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 addition, 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.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2004年第2期373-378,共6页
Journal of Inorganic Materials
基金
国家自然科学基金(29971022)
关键词
γ-MnO2纳米粉体
γ-MnO2薄膜
添加剂
催化性能
悬浮粒子烧结法
薄膜结构
催化性能
Additives
Atomic force microscopy
Catalysts
Manganese compounds
Microstructure
pH
Pore size
Scanning electron microscopy
Sintering
Surface topography
Thin films
X ray diffraction analysis
