分别采用共沉淀法、胶溶法和胶溶-共沉淀法制备了Ce0.5Zr0.5O2(12wt%)-Al2O3(CZA)储氧材料, 并通过XRD、低温N2吸附?脱附、氧脉冲吸附(OSC)、程序升温还原(H2-TPR)和O2-程序升温脱附(O2-TPD)等手段进行了表征. 材料经过1000℃焙烧后, XRD结果表明, 三种方法制备的样品均存在CeO2-ZrO2立方萤石和γ-Al2O3两种晶型. N2吸附-脱附结果表明, 胶溶-共沉淀法制备的样品, 具有最大的比表面积和孔容, 分别为146.2m2/g和0.5mL/g, 且有最佳的孔径分布; 氧脉冲吸附(OSC)和H2-TPR结果表明胶溶?共沉淀法制备的材料, 具有最佳的储氧性能和还原能力; 同时实验还比较了经1100℃焙烧对几种方法制备样品性能的影响.
Oxygen storage material of Ce0.5Zr0.5O2(12wt%)-Al2O3(CZA) was prepared by three different methods of coprecipitation, peptization and peptization-coprecipitation. The structure and physicochemical properties of materials were characterized by X-ray diffraction (XRD), N2 adsorption-desorption, oxygen pulse adsorption (OSC), H2-temperature programmed reduction (TPR) and O2-programmed desorption (O2-TPD). The XRD results demonstrate that all the samples have CeO2-ZrO2 cubic fluorite and γ-Al2O3 after calcined at 1000℃. The results according to N2 adsorption-desorption show that the sample prepared by peptization-coprecipitation has higher specific surface area (146.2 m2/g), larger pore volume (0.5 mL/g), and the best distribution of the pore size. The results from OSC and H2-TPR indicate that the sample prepared by peptization-coprecipitation has the best performance of oxygen storage and reduction capacity. At the same time, the influence of different methods on the properties of samples after calcined at 1100℃ are discussed.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | Wang J, Wen J, Shen M Q. Effect of interaction between Ce0.7Zr0.3O2 and Al2O3 on structural characteristics, thermal stability, and oxygen storare capacity. J. Phys. Chem. C, 2008, 112(13): 5113-5122.[2] Liotta L F , Macaluso A, Longo A, et al. Effects of redox treatments on the structural composition of a ceria-zirconia oxide for application in the three-way catalysis. Appl. Catal. A: Gen., 2003, 240(1/2): 295-307[3] Kaspar J, Fornasiero P J. Nanostructured materials for advanced automotive de-pollution catalysts. Solid State Chem., 2003, 171(1/2): 19-29.[4] Iglesias-Juez A, Martinez-Arias A, Fernandez-Garcia M. Metal-promoter interface in Pd/(Ce,Zr)Ox/Al2O3 catalysts: effect of thermal aging. J. Catal., 2004, 221(1):148-161.[5] Yao M H, Baird R J, Kunz F W, et al. An XRD and TEM investigation of the structure of alumina-supported ceria-zirconia. J. Catal., 1997, 166(1): 67-74.[6] Fernandez-Garcia M, Martinez-Arias A, Iglesias-Juez A, et al. Structural characteristics and redox behavior of CeO2-ZrO2/Al2O3 supports. J. Catal., 2000, 194(2): 385-392.[7] 张丽娟, 董文萍, 陈耀强, 等(ZHANG Li-Juan, et al). 胶溶法制备改性氧化铝的结构及织构特点. 高等学校化学学报(Chem. J. Chinese U.), 2007, 28(5): 968-970.[8] Wei Z L, Li H M, Zhang X Y, et al. Preparation and property investigation of CeO2-ZrO2-Al2O3 oxygen-storage compounds. Journal of Alloys and Compounds, 2008, 455(1/2): 322-326.[9] 祝清超, 黎秀敏, 李红梅, 等. 掺杂钇铋Ce-Zr-Al储氧材料的制备及性能研究. 无机材料学报(Journal of Inorganic Materials), 2010, 25(1):13-17.[10] Chen Min, Zhang Peizhuang, Zheng Xiaoming. A new preparation method for nano-sized Ce&ndash |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%