Catalytic Studies on the Mixed Ceria-Zirconia Doped La3+, Pr3+ or Mn4+
A number of experiments were carried out with different Ce-Zr oxides doped La3+、Pr3+ or Mn4+ in order to improve their performance as a promoter for three way catalyst(TWC). The XRD results showed that the thermal stability of Ce-Zr oxide doped lanthanum or praseodymium was improved, especially at high temperature. H2-TPR test detected the low –temperature redox behavior of Ce-Zr oxide was promoted strongly attributed to the MnO2, with calcined temperature increasing, the reduction peaks were moved to high temperature for Ce-Zr oxide doped La3+ and Pr3+. The catalytic activity of Ce-Zr oxide doped Mn4+ was also enhanced, the light-off temperature was lower 10K than Ce-Zr oxide; the conversions of CO and THC were higher 3-4% than Ce-Zr oxide.
Chunli BAI, Sishen XIE, Xing ZHU
M. F. Wen et al., "Catalytic Studies on the Mixed Ceria-Zirconia Doped La3+, Pr3+ or Mn4+", Solid State Phenomena, Vols. 121-123, pp. 323-326, 2007