Influence of Ce0.35Zr0.55La0.10O1.95 Solid Solution on the Performance of Low Pt-Rh Three-way Catalysts

Ce_0.35Zr_0.55La_0.10O_1.95 solid solution was prepared by coprecipitation technique and characterized by specific surface area measurements (BET), X-ray diffraction (XRD), and temperature-programmed (TP) technique. Ce_0.35Zr_0.55La_0.10O_1.95 was used to prepare low Pt-Rh three-way catalyst (TWC) and its influence on the performance of TWC was investigated. The results showed that Ce_0.35Zr_0.55La_0.10O_1.95 had a cubic structure similar to Ce_0.50Zr_0.50O₂ and a large specific area after calcined at 600 °C for 5 h. Furthermore, after being aged at 1000 °C for 5 h, Ce_0.35Zr_0.55La_0.10O_1.95 still maintained a stable cubic structure and a specific surface area of 47.25 m²·g^?1. The results of H₂-TPR and O₂-TPO indicated that Ce_0.35Zr_0.55La_0.10O_1.95 had good redox properties. The catalyst containing Ce_0.35Zr_0.55La_0.10O_1.95 possessed a fairly wide range of three-way working-windows, good low-temperature light-off properties, and better ability of water-gas shift. Being hydrothermally aged at 1000 °C, the catalyst containing Ce_0.35Zr_0.55La_0.10O_1.95 still showed good catalytic activity in comparison with Ce_0.50Zr_0.50O₂ TWC, which indicated that Ce_0.35Zr_0.55La_0.10O_1.95 improved the anti-aging properties of the catalyst.