Catalytic Studies on the Mixed Ceria-Zirconia Doped La³⁺, Pr³⁺ or Mn⁴⁺

Abstract:

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.

• Periodical: Solid State Phenomena (Volumes 121-123)
• Pages: 323-326
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.121-123.323
• Online since: March 2007
• Authors: Ming Fen Wen, D. Yang, Jian Chen, Ch.L. Song, Yong Wan Gu
• Keywords: Catalytic Activity, Ce-Zr Oxide, H₂-TPR, MnO₂

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[20] [40] [60] [80] 100 (a) Conversion, % Temperature, K CO THx NOx 500 550 600 650 700 750.

[20] [40] [60] [80] 100 (b) Conversion, % Temperature, K CO THC NOx 500 550 600 650 700 750.

[20] [40] [60] [80] 100 (c) Conversion, % Temperature, K CO THC NOx 500 550 600 650 700 750.

[20] [40] [60] [80] 100 (d) Conversion, % Temperature, K CO THC NOx.