Influence of Ce_(0.35)Zr_(0.55)Y_(0.10) Solid Solution on Performance of Pt-Rh Three-Way Catalysts

摘要

Ce_(0.35)Zr_(0.55)Y_(0.10) solid solution was prepared by co-precipitation technique and characterized by specific surface area measurements (BET) and X-ray diffraction (XRD). Ce_(0.35)Zr_(0.55)Y_(0.10) was used to prepare low Pt-Rh three-way catalyst (TWC), and its influence on the performance of TWC was investigated. The results revealed that Ce_(0.35)Zr_(0.55)Y_(0.10) had a cubic structure similar to Ce_(0.50)Zr_(0.50)O_2 and its specific surface area can maintain higher than Ce_(0.50)Zr_(0.50)O_2 after 1000℃ calcination for 5 h. Being hydrothermal aged at 1000℃ for 5 h, the catalyst containing Ce_(0.35)Zr_(0.55)Y_(0.10) still exhibited higher conversion of C_3H_8, CO and NO and lower light-off temperature in comparison with Ce_(0.50)Zr_(0.50)O_2 TWC.