共沈法による自動車排ガス浄化用助触媒CeO2-ZrO2-MOx(M=遷移元素及び希土類元素)系粉末の調製

中谷 利雄; 脇田 崇弘; 大田 陸夫; 田中 勝久; 若杉 隆

doi:10.2109/jcersj.111.137

Preparation of Mixed Oxide Powders in the System CeO₂-ZrO₂-MO_x (M=Transition and Rare Earth Metals) by Coprecipitation Method for the Purification Catalysts of Automotive Emission

Toshio NAKATANI, Takahiro WAKITA, Rikuo OTA, Katsuhisa TANAKA, Takashi WAKASUGI

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Keywords: Ceria-zirconia, Specific surface area (SA), Oxygen storage capacity (OSC), Transition metal oxides, Rare earth metal oxides

JOURNAL FREE ACCESS

2003 Volume 111 Issue 1290 Pages 137-141

DOI https://doi.org/10.2109/jcersj.111.137

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Abstract

Powders in the CeO₂-ZrO₂-MO_x system were prepared by coprecipitation method. Influence of adding a third components MO_x of transition metal oxides and rare earth metal oxides on the specific surface area (SA) and oxygen storage capacity (OSC) were investigated. It was found that transition metal oxides decrease drastically both SA and OSC values at 1000°C. On the other hand, rare earth metal oxides slightly decreased OSC values. The OSC values of the 20CeO₂-(80-y)ZrO₂-yMO_x powders with y=0-20 mol% LaO_1.5, showed a maximum at around 6 mol% LaO_1.5. In the CeO₂-ZrO₂-MO_x system, 20CeO₂·74ZrO₂·6LaO_1.5 (mol%) powders exhibited the most efficient performance with a high thermal stability up to 1000°C.

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