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

In this study, two series of cerium zirconium mixed oxides Ceo.35Zro.ssLao.055Pro.04502 were preparedunder traditional co-precipitation and oxidation co-precipitation methods respectively. The physico-chemical properties of the samples were compared under these two methods and assessed by XRD,Raman, BET, TEM, H2TPR, OSC, XPS and catalysts measurements. The formation of homogeneity phasestructure can be facilitated by changing the precipitating properties of Ce3＋ under oxidation co-precipitation 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 CI by oxidation co-precipitation withhydrogen peroxide. The catalysts activities are related to both the redox properties and the texturalproperties of mixed oxides. The Pd-only TWCs supported on the CZLP-H-F exhibits better catalyticperformance and thermal stability with wider air]fuel ratio operation window, lower light-off and fullconversion temperatures of C3H8 and NO. The homogeneity of phase structure for cerium zirconiummixed oxide can be predicted and deduced from detecting the atomic distribution uniformity of itsprecursor. So this work not only provides insights into the mechanisms for phase segregation of ceriumzirconium mixed oxide, but also provides a guidance to improve homogeneity of cerium zirconiummixed oxide by adding additives.