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Catalysis Letters

, Volume 130, Issue 3–4, pp 532–540 | Cite as

Water–Gas Shift Reaction over CuO/CeO2 Catalysts: Effect of the Thermal Stability and Oxygen Vacancies of CeO2 Supports Previously Prepared by Different Methods

  • Lei Li
  • Yingying Zhan
  • Qi Zheng
  • Yuanhui Zheng
  • Chongqi Chen
  • Yusheng She
  • Xingyi Lin
  • Kemei Wei
Article

Abstract

A series of CuO/CeO2 catalysts were prepared through a two-step process: (1) CeO2 supports were firstly prepared by precipitation (P), hydrothermal (HT) and sol-gel (SG) methods, respectively; and (2) CuO was deposited on the above CeO2 supports by deposition-precipitation method. The as-synthesized CeO2 supports and CuO/CeO2 catalysts were characterized by N2-physisorption, XRD, XPS, Raman, and H2-TPR. The CuO/CeO2 catalysts were examined with respect to their catalytic activity for the water–gas shift reaction, and their catalytic activities are ranked as: CuO/CeO2-P > CuO/CeO2-HT > CuO/CeO2-SG. The results suggest that the CeO2 prepared by precipitation (i.e., CeO2-P-300) has the best thermal stability and the most amounts of surface oxygen vacancies, which make the corresponding CuO/CeO2-P catalyst present the largest pore volume, the smallest crystal size of CuO, the highest microstrain (i.e., the highest surface energy) and the most amounts of active sites (i.e., the moderate copper oxide (crystalline) interacted with surface oxygen vacancies of ceria). Therefore, the catalytic activity of CuO/CeO2 catalysts, in nature, depends on the thermal stability and the number of surface oxygen vacancies of the CeO2 supports previously prepared by different methods.

Keywords

Water–gas shift reaction CuO/CeO2 Thermal stability Oxygen vacancy CeO2 support Different preparation methods 

Notes

Acknowledgments

The authors acknowledge the financial support from the Department of Science of the People’s Republic of China (20771025), the Department of Science of Fujian Province (2007J0221) and the Department of Science & Technology of Fujian Province (2005H201-2).

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Lei Li
    • 1
  • Yingying Zhan
    • 1
  • Qi Zheng
    • 1
  • Yuanhui Zheng
    • 2
  • Chongqi Chen
    • 1
  • Yusheng She
    • 1
  • Xingyi Lin
    • 1
  • Kemei Wei
    • 1
  1. 1.National Engineering Research Center of Chemical Fertilizer CatalystsFuzhou UniversityFuzhouPeople’s Republic of China
  2. 2.Materials EngineeringMonash UniversityClaytonAustralia

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