Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (01): 73-78.doi: 10.1016/S1872-1508(07)60007-2

• ARTICLE • Previous Articles     Next Articles

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

GUO Jia-Xiu;YUAN Shu-Hua;GONG Mao-Chu;ZHANG Lei;WU Dong-Dong;ZHAO Ming;CHEN Yao-Qiang   

  1. College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
  • Received:2006-07-18 Revised:2006-09-05 Published:2007-01-08
  • Contact: CHEN Yao-Qiang

Abstract: Ce0.35Zr0.55La0.10O1.95 solid solution was prepared by coprecipitation technique and characterized by specific surface area measurements (BET), X-ray diffraction (XRD), and temperature-programmed (TP) technique. Ce0.35Zr0.55La0.10O1.95 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 Ce0.35Zr0.55La0.10O1.95 had a cubic structure similar to Ce0.50Zr0.50O2 and high specific area after calcined at 600 ℃ for 5 h. Furthermore, after being aged at 1000 ℃ for 5 h, Ce0.35Zr0.55La0.10O1.95 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 Ce0.35Zr0.55La0.10O1.95 had good redox properties. The catalyst containing Ce0.35Zr0.55La0.10O1.95 possessed fairly wide range of three-way working-windows, good low temperature light-off properties, and better ability of water-gas shift. Being hydrothermal aged at 1000 ℃, the catalyst containing Ce0.35Zr0.55La0.10O1.95 still showed good catalytic activity in comparison with Ce0.50Zr0.50O2 TWC, which indicated that Ce0.35Zr0.55La0.10O1.95 improved the anti-aging properties of the catalyst.

Key words: Low precious metal, Three-way catalyst, Temperature-programmed technique, Redoxidation