采用共沉淀方法制备了一系列Ce-Zr-Mn 复合氧化物储氧材料, 并应用X射线衍射(XRD), BET, 氧吸附, 以及程序升温还原(TPR)对这些样品进行表征, 研究了样品老化前后的结构和织构变化, 储氧性能, 还原性能以及物相的变化. 结果表明, 在Ce-Zr固溶体中掺入少量的Mn可以显著提高储氧材料的储氧能力, 降低还原温度, 而且均形成稳定的立方晶相的CeO2-ZrO2固溶体. 当Mn含量(摩尔分数)达到0.025时, 样品的储氧量达到最高, 同时在织构上表现出优越的抗老化性能, 经1273K高温老化5h后比表面积可高达57.8m2/g.
A series of
Ce-Zr-Mn compound oxides oxygen storage materials were synthesized by a
co-precipitation method and characterized by X-ray diffraction (XRD), BET,
oxygen adsorption and temperature programmed reduction (TPR). The modification of the textural and structural properties, oxygen storage capacity, redox
behavior, and phase changes were investigated. The results show that incorporating a small amount of manganese into Ce-Zr solid solution can remarkably improve the oxygen storage capacity and decrease the temperature of the reduction of the oxygen storage materials. Moreover, only a stable
cubic phase CeO2-ZrO2 solid solution is formed. The Ce-Zr-Mn Compound oxide indicates the highest oxygen storage capacity (OSC) and excellent property of resistance to aging when manganese content (mole fraction) is
0.025, its surface area can reach 57.8m2/g after aging 5h at 1273K.
参考文献
| [1] | Kaspar J, Fornasiero P, Graziani M. Catalysis Today, 1999, 50: 285--298. [2] Shin’ichi Matsumoto. Catalysis Today, 2004, 90: 183--190. [3] 闫宗兰, 罗孟飞, 谢冠群, 等(YAN Zong-Lan, et al). 无机材料学报(Journal of Inorganic Materials), 2005, 21 (3): 425--428. [4] Fornasicro P, Balducci G, Di Monte R, et al. Journal of Catalysis, 1996, 164: 173--183. [5] He H, Dai H X, Ng L H, et al. Journal of Catalysis, 2002, 206: 1--13. [6] Marta Boaro, Carla De Liebenberg, Giuliano Dolcetti, et al. Journal of Catalysis, 2000, 193: 338--347. [7] Kaspar J, Fornasicro P, Balducci G, et al. Inorganica Chimica Acta, 2003, 349: 217--236. [8] Imamura S, Shono M, Okamoto N, et al. Applied Catalysis A: General 1996, 142: 279--288. [9] 阎忠君, 杨栋, 文明芬, 等(YAN Zhong-Jun, et al). 中国稀土学报(China Journal of Rare Earths), 2005, 23 (3): 349--352. [10] Carla E. Hori, Haryani Permana, K.Y. Simon Ng, et al. Applied Catalysis B: Environmental, 1998, 16: 105--117. [11] Terribile D, T rovarelli, Leitenburg C, et al. Catalysis Today, 1999, 47: 133--140. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%