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Catalysis Letters

, Volume 116, Issue 3–4, pp 161–166 | Cite as

Phase transformation in CeO2–Co3O4 binary oxide under reduction and calcination pretreatments

  • Chih-Wei Tang
  • Wen-Yueh Yu
  • Chin-Jung Lin
  • Chen-Bin Wang
  • Shu-Hua Chien
Article

Abstract

The CeO2–Co3O4 binary oxide was prepared by impregnation of the high surface area Co3O4 support (S.A. = 100m2 g−1) with cerium nitrate (20 wt% cerium loading on Co3O4). Pretreatment of CeO2–Co3O4 binary oxide was divided both methods: reduction (under 200 and 400 °C, assigned as CeO2–Co3O4–R200 and CeO2–Co3O4–R400 and calcination (under 350 and 550 °C, assigned as CeO2–Co3O4–C350 and CeO2–Co3O4–C550). The binary oxides were investigated by means of X-ray diffraction (XRD), nitrogen adsorption at −196 °C, infrared (IR), transmission electron microscopy (TEM), diffuse reflectance spectroscopy (DRS) and temperature programmed reduction (TPR). The results showed that the binary oxides pretreatment under low-temperatures possessed larger surface area. The cobalt phase of binary oxides also was transferred upon the treating temperature, i.e., the CeO2–Co3O4–R200 binary oxide exhibited higher surface area (S.A. = 109m2 g−1) and the main phase was CeO2,Co3O4 and CoO. While, the CeO2–Co3O4–R400 binary oxide exhibited lower surface area (S.A. = 40m2 g−1) and the main phase was CeO2, CoO and Co. Apparently, the optimized pretreatment of CeO2–Co3O4 binary oxide can control both the phases and surface area.

Keywords

CeO2–Co3O4 binary oxide phase transformation X-ray diffraction 

Notes

Acknowledgments

We are pleased to acknowledge financial supports for this study from Academia Sinica and the National Science Council of the Republic of China.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.Department of Applied Chemistry and Materials Science, Chung Cheng Institute of TechnologyNational Defense UniversityTahsiTaiwan, ROC
  2. 2.Institute of Chemistry, Academia SinicaTaipeiTaiwan, ROC
  3. 3.Department of ChemistryNational Taiwan UniversityTaipeiTaiwan, ROC

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