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Catalysis Letters

, Volume 119, Issue 3–4, pp 265–270 | Cite as

Role of Surface Area in Oxygen Storage Capacity of Ceria–Zirconia as Soot Combustion Catalyst

  • Qing Liang
  • Xiaodong Wu
  • Xiaodi Wu
  • Duan Weng
Article

Abstract

Two thermal stable phases, Ce0.75Zr0.25O2 and Ce0.16Zr0.84O2, with different surface area were prepared by coprecipitation. The oxygen storage capacity (OSC) measurements were carried out at 500 °C under both transient (CO–O2 cycle at 0.05, 0.1 and 0.25 Hz) and stationary reaction conditions (CO pulse). In the oxygen storage/release process, the rate-determine step is surface reactions when the specific surface area is lower than 60 m2/g. When the surface area increases further, the influence of surface area is less important. The increased surface area favors diesel soot catalytic combustion via providing more redox sites to activate adsorbed oxygen. Nevertheless, this effect is less important when the specific surface area is larger than 40 m2/g, especially under loose contact condition.

Keywords

CeO2–ZrO2 Specific surface area OSC Soot catalytic oxidation 

Notes

Acknowledgments

The authors would like to acknowledge the Ministry of Science and Technology, PR China for the financial support of Project 2004CB719503 and National Natural Science Foundation of China for the financial support of Project 50502023.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.Laboratory of Advanced Materials, Department of Materials Science and EngineeringTsinghua UniversityBeijingChina

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