J. Smialek—contributing editor
Effect of Ba2+ Addition on Phase Separation and Oxygen Storage Capacity of Ce0.5Zr0.5O2 Powder
Article first published online: 18 OCT 2010
© 2010 The American Ceramic Society
Journal of the American Ceramic Society
Volume 94, Issue 3, pages 895–901, March 2011
How to Cite
Chuang, C.-C., Chen, M.-J., Hsiang, H.-I., Yen, F.-S. and Chen, C.-C. (2011), Effect of Ba2+ Addition on Phase Separation and Oxygen Storage Capacity of Ce0.5Zr0.5O2 Powder. Journal of the American Ceramic Society, 94: 895–901. doi: 10.1111/j.1551-2916.2010.04159.x
This work was supported by Taiwan's Ministry of Economic Affairs (contract no. 96-EC-17-A-08 -S1-023) through the Particulate Materials Research Center of National Cheng Kung University, Tainan, Taiwan.
- Issue published online: 11 MAR 2011
- Article first published online: 18 OCT 2010
- Manuscript No. 27900. Received April 23, 2010; approved September 1, 2010.
Ce0.5Zr0.5O2 (CZ) plays an important role in three-way catalyst for its outstanding oxygen storage capacity (OSC). However, CZ decomposes into Ce- and Zr-rich phases after high-temperature calcinations, which results in the degradation of OSC. In this study, CZ was synthesized using a coprecipitation method. Subsequently, different amounts of Ba2+ ions were introduced into the CZ using an incipient wetness impregnation method followed by calcination at 1000°C for 2 h to obtain a series of so-called BCZa powders. The Ba2+ ion addition effects on the phase development, specific surface area, crystallite size, agglomeration, and OSC of CZ were investigated. The addition of 0.5–3 wt% Ba2+ ions significantly increased the specific surface area and inhibited CZ phase separation. However, with the addition of Ba2+ ions at or above 10 wt%, severe agglomeration occurred and Ba(CexZr1−x)O3 (0<x<1) was detected, both of which contributed to lowering the OSC of BCZa. With the addition of 5 wt% Ba2+ ions, the BCZa exhibited the maximum OSC (91.4 μmol/g), due to the high abundance of active oxygen species on the interface between Ce0.5Zr0.5O2 and BaZrO3.