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Effect of Ba 2+ Addition on Phase Separation and Oxygen Storage Capacity of Ce 0.5 Zr 0.5 O 2 Powder
Author(s) -
Chuang ChiaChe,
Chen MingJay,
Hsiang HsingI,
Yen FuSu,
Chen ChihCheng
Publication year - 2011
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2010.04159.x
Subject(s) - calcination , coprecipitation , crystallite , materials science , ion , analytical chemistry (journal) , phase (matter) , oxygen , nuclear chemistry , catalysis , mineralogy , inorganic chemistry , chemistry , metallurgy , chromatography , biochemistry , organic chemistry
Ce 0.5 Zr 0.5 O 2 (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 Ba 2+ 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 Ba 2+ 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% Ba 2+ ions significantly increased the specific surface area and inhibited CZ phase separation. However, with the addition of Ba 2+ ions at or above 10 wt%, severe agglomeration occurred and Ba(Ce x Zr 1− x )O 3 (0< x <1) was detected, both of which contributed to lowering the OSC of BCZa. With the addition of 5 wt% Ba 2+ ions, the BCZa exhibited the maximum OSC (91.4 μmol/g), due to the high abundance of active oxygen species on the interface between Ce 0.5 Zr 0.5 O 2 and BaZrO 3 .