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 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.
参考文献
| [1] | Reo C M, Berstein L A, Lund C R F. AIChE Journal, 1997, 43 (2): 495--503. [2] Xiao T D, Strutt P R, Benaissa M, et al. NanoStructured Materials, 1998, 10 (6): 1051--1061. [3] Tsuru T, Wada S I, Izumi S, et al. Journal of Membrane Science, 1998, 149: 127--135. [4] Xia C R, Cao H Q, Wang H, et al. Journal of Membrane Science, 1999, 162: 181--188. [5] Liu B S, Wu G H, Niu G H, et al. Applied Catalysis A: General, 1999, 185: 1--10. [6] 赵丽丽, 王榕树, 牛文泰, 等. 物理化学学报, 2002, 18 (3): 197--200. [7] 刘勇, 王敬先, 杨竹仙, 等. 物理化学学报, 2000, 16 (6): 533--537. [8] Haack L P, Peters C R, deVries J E, et al. Applied Catalysis A: General, 1992, 87: 103--114. [9] Lafarga D, Lafuente A, Menendez M, et al. Journal of Membrane Science, 1998, 147: 173--185. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%