共沈法による自動車排ガス浄化用助触媒CeO_2-ZrO_2-MO_x (M=遷移元素及び希土類元素)系粉末の調製

概要

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Powders in the CeO_2-ZrO_2-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℃. On the other hand, rare earth metal oxides slightly decreased OSC values. The OSC values of the 20CeO_2- (80-y) ZrO_2-yMO_x powders with y=0-20 mol% LaO_1.5, showed a maximum at around 6 mol% LaO_1.5. In the CeO_2-ZrO_2-MO_x system, 20CeO_2・74ZrO_2・6LaO_1.5 (mol%) powders exhibited the most efficient performance with a high thermal stability up to 1000℃.
社団法人日本セラミックス協会の論文
2003-02-01