Superior catalytic activity and high thermal durability of MgAl2O4 modified Pt/Ce0.5Zr0.5O2 TWC

Improving the high temperature stability of three-way catalyst (TWC) is of great importance for the purification of automobile exhaust. In this work, Pt/MgAl2O4-Ce0.5Zr0.5O2 TWC with high activity and stability was prepared by liquid phase reduction impregnation combined with high-energy ball milling technology, aiming to study the effect of MgAl2O4 on the activity and high temperature stability. The results showed that the catalytic activity of Pt/MgAl2O4-Ce0.5Zr0.5O2 catalyst was superior to Pt/Al2O3-Ce0.5Zr0.5O2 and Pt/Ce0.5Zr0.5O2 before and after aging. Combined with the characterization results, the considerable stability of Pt/MgAl2O4-Ce0.5Zr0.5O2 catalyst was due to the increased specific surface area and redox performance, smaller Pt particle size and improved dispersion. In addition, the strong interaction between MgAl2O4 and Pt effectively realized that Pt anchored on the support more stable and distributed more uniformly under high temperature conditions. Hence, the method of MgAl2O4 doping modification provided a new idea and solution for improving high temperature stability of TWC.