期刊
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
卷 78, 期 5, 页码 752-767出版社
CHEMICAL SOC JAPAN
DOI: 10.1246/bcsj.78.752
关键词
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Innovative three-way catalysts containing ceria-zirconia solid solutions (CZ) with a ZrO2 content ranging from 5 to 75 mol% were developed. Such catalysts have very high oxygen storage/release capacity (OSC). The OSC of catalysts containing first-generation CZ was found to increase linearly with the amount of zirconia dissolved in the solid solution in the 0-20 mol% ZrO2 range. The thermal stability of the catalyst containing first-generation CZ was higher than that containing ceria. Second-generation CZ with greater OSC than first-generation CZ was developed by a homogeneous coprecipitation process, followed by heat-treatment below 1000 degrees C, enabling dissolution of zirconia into ceria up to 75 mol% zirconia as estimated by XRD. Third-generation CZ, CZ-doped alumina (ACZ), was developed by homogeneous coprecipitation based on the diffusion barrier concept. The OSC of ACZ was 23 times larger than that of pure ceria. The NOx emission over the catalyst containing ACZ was reduced by about a factor of five compared with that containing pure ceria. Toyota Motor Corp. has put three-way catalysts containing first-, second-, and third-generation CZ into practical use globally.
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