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The effect of hydrogen peroxide on properties of Ce0.35Zr0.55La0.055Pr0.045O2 oxides and the catalytic performance usedon Pd supported three-way catalyst

查看全文 作　　者：Qi [1,2]wang;Meisheng [1,2]Cui;Xiaowei [1,2]Huang;Yongke [1,2]Hou;Mei [1,2]Yue;Qiang [1,2]Zhong;[1,2]YongqiZhang 高影响力作者 机构地区：[1]General Research Institute for Non-Ferrous Metals, Beijing 100088, China;[2]Grirem Advanced Materials Co., Ltd, Beijing 100088, China高影响力机构 出　　处：《Journal of Rare Earths》索引2017年第35卷第11期,共10页高影响力期刊 基　　金：the financial supports from Grirem Advanced Materials Co.,Ltd. 摘　　要：In this study,two series of cerium zirconium mixed oxides Ce_(0.35)Zr_(0.55)La_(0.055)Pr_(0.045)O_2 were prepared under traditional co-precipitation and oxidation co-precipitation methods respectively. The physicochemical properties of the samples were compared under these two methods and assessed by XRD,Raman,BET,TEM,H_2 TPR,OSC,XPS and catalysts measurements. The formation of homogeneity phase structure can be facilitated by changing the precipitating properties of Ce3+ under oxidation coprecipitation method, which is helpful to enhance the homogeneity of Ce and Zr at atomic level.What's more, it is conducive to remove impurities Na^+ and Cl^-by oxidation co-precipitation with hydrogen peroxide. The catalysts activities are related to both the redox properties and the textural properties of mixed oxides. The Pd-only TWCs supported on the CZLP-H-F exhibits better catalytic performance and thermal stability with wider air/fuel ratio operation window, lower light-off and full conversion temperatures of C_3 H_8 and NO. The homogeneity of phase structure for cerium zirconium mixed oxide can be predicted and deduced from detecting the atomic distribution uniformity of its precursor. So this work not only provides insights into the mechanisms for phase segregation of cerium zirconium mixed oxide, but also provides a guidance to improve homogeneity of cerium zirconium mixed oxide by adding additives. 关 键 词：CERIUM ZIRCONIUM mixed OXIDES CO-PRECIPITATION Hydrogen PEROXIDE Catalytic performance
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