Effect of cobalt doping on ceria-zirconia mixed oxide: Structural characteristics, oxygen storage/release capacity and three-way catalytic performance

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• 作者：Jianqiang WANG ; Meiqing SHEN ; Jun WANG ; Jidong GAO ; Jie MA ; Shuangxi LIU
• 关键词：three-way catalyst ; stoichiometric window ; dynamic oxygen storage capacity ; water-gas shift ; steam reforming ; Co doping ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2012
• 出版时间：September, 2012
• 年：2012
• 卷：30
• 期：9
• 页码：878-883
• 全文大小：546 K

文摘

The effect of Co doping on ceria-zirconia mixed oxides was investigated for Co_0.1Ce_0.6Zr_0.3O_x sample prepared by sol-gel method. The Pd-only three-way catalyst (TWC) was obtained by incipient wetness impregnation with 0.5 wt. % Pd loading. The structural and oxygen handling properties were analyzed by X-ray diffraction (XRD), H₂-temperature programmed reduction (H₂-TPR) and the dynamic oxygen storage capacity (DOSC). The introduction of Co into ceria-zirconia lattice strongly modified the mobility of oxygen and enhanced the DOSC performance. Pd-only TWC based on the Co_0.1Ce_0.6Zr_0.3O_x support exhibited superior activity for water-gas shift and steam reforming and amplified amplitude of stoichiometric window.