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Journal of Materials Science

, Volume 26, Issue 17, pp 4818–4822 | Cite as

Reduction reaction of lanthanum-added cerium dioxide with carbon monoxide

  • M. Ozawa
  • M. Kimura
  • A. Isogai
Papers

Abstract

The reaction of lanthanum-added cerium dioxide with carbon monoxide was examined by using a CO pulse reaction method and high-temperature X-ray diffraction (XRD). The lanthanum addition enhanced the activity of cerium dioxide for oxidizing carbon monoxide under moderately reducing conditions. Isothermal XRD observation at 500 and 700 °C indicated that the reduction reaction of CeO2 and La-added CeO2 with CO progressed in CO-N2 flowing gas. The kinetics of the reaction CeO2 + x/2CO → Cex1−x/4+Ce x 3+ O2−x/2 + x/2CO2 + x/2V0 was analysed by Jander's model: [1−(1−x)1/3]2=kt.

Keywords

CeO2 Oxygen Vacancy Lattice Oxygen Pulse Number Cerium Dioxide 

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References

  1. 1.
    D. J. M. Beven and J. Kordis, J. Inorg. Nucl. Chem. 26 (1964) 1509.CrossRefGoogle Scholar
  2. 2.
    H. S. Gandhi, A. G. Piken, M. Shelef and R. G. Dolosh, SAE paper No. 760201 (Society of Automotive Engineers, Warrendale, Pennsylvania, 1976).Google Scholar
  3. 3.
    Y. F. Yu-Yao and J. T. Kummer, J. Catal. 106 (1987) 307.CrossRefGoogle Scholar
  4. 4.
    H. C. Yao and Y. F. Yu-Yao, ibid. 86 (1984) 254.CrossRefGoogle Scholar
  5. 5.
    E. C. Su, C. N. Montreuil and W. G. Rothschild, Appl. Catal. 17 (1985) 75.CrossRefGoogle Scholar
  6. 6.
    R. K. Herz and J. A. Sell, J. Catal. 94 (1985) 166.CrossRefGoogle Scholar
  7. 7.
    J. C. Schlatter and P. J. Mitchell, Ind. Eng. Chem. Res. Dev. 19 (1980) 288.CrossRefGoogle Scholar
  8. 8.
    G. Kim, ibid. 21 (1982) 267.CrossRefGoogle Scholar
  9. 9.
    N. Miyoshi, S. Matsumoto, M. Ozawa and M. Kimura, SAE paper No. 891 970 (Society of Automotive Engineers, Dearborn, Michigan, 1989).Google Scholar
  10. 10.
    S. Matsumoto, N. Miyoshi, T. Kanazawa, M. Kimura and M. Ozawa, “Catalytic Science and Technology Vol. 1, edited by S. Yoshida, N. Tabezawa and T. Ono (Kodansha, Tokyo, VCH; New York, 1991) p. 335.Google Scholar
  11. 11.
    E. Zintl and U. Croatto, Z. anorg. allgem. Chem. 242 (1939) 79.CrossRefGoogle Scholar
  12. 12.
    T. Takahashi and H. Iwahara, Denki Kagaku 34 (1966) 906.Google Scholar
  13. 13.
    W. Jander, Z. anorg. allgem. Chem. 163 (1927) 1.CrossRefGoogle Scholar
  14. 14.
    V. M. Goldschmidt, “Geochemische Verteilungsgesetze der Elemente”, (Skrifter Nerske Videnskarp-Akad., Oslo, 1926).Google Scholar
  15. 15.
    L. Pauling, “The nature of the chemical bond” (Cornell University, Cornell, 1960).Google Scholar
  16. 16.
    T. Kudo and H. Obayashi, J. Electrochem. Soc. 122 (1975) 142.CrossRefGoogle Scholar
  17. 17.
    R. T. Dirstine, R. N. Blumenthal and T. F. Keuch, ibid. 126 (1979) 264.CrossRefGoogle Scholar
  18. 18.
    W. E. Armstrong and D. L. Tolliver, ibid. 121 (1974) 307.CrossRefGoogle Scholar
  19. 19.
    T. Kudo and H. Obayashi, ibid. 123 (1976) 415.CrossRefGoogle Scholar

Copyright information

© Chapman & Hall 1991

Authors and Affiliations

  • M. Ozawa
    • 1
  • M. Kimura
    • 1
  • A. Isogai
    • 1
  1. 1.Toyota Central Research and Development Laboratories, Inc.AichiJapan

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