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Effects of Different Preparation Methods on the Properties of CeO2―ZrO2―Al2O3

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Author(s): JIAO Yi, TANG Shi-Yun, WANG Jian-Li, ZHU Qing-Chao, CHEN Yao-Qiang, GONG Mao-Chu

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 26;
Issue: 8;
Start page: 813;
Date: 2011;
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Keywords: CeO2-ZrO2-Al2O3; structure properties; oxygen storage capacity; redox property

ABSTRACT
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¡æ. 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¡æ are discussed.
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