Skip to main content Accessibility help
×
Home

Nanocrystalline Doped Cerium Oxide as a Catalyst for SO2 Reduction by Co

  • Andreas Tschöpe (a1), J. Y. Ying (a1), W. Liu (a1) and M. Flytzani-Stephanopoulos (a2)

Abstract

Nanocrystalline processing by inert gas condensation has the inherent advantages of generating: (1) high surface area nanoclusters, (2) non-stoichiometric oxides, and (3) high dispersions of dopants. This approach is exploited in the synthesis of fluorite-structured catalysts for SO2 reduction by CO. Nanocrystalline CeO2-x, La-doped CeO2-x, and Cu-doped CeO2-x were produced by magnetron sputtering from a pure or mixed metal target, followed by controlled oxidation of the metallic clusters. The as-prepared doped and undoped nanocrystalline CeO2-x materials were found to be excellent catalysts for complete SO2 conversion to elemental sulfur. Undoped nanocrystalline CeO2-x enabled light-off at 460 °C, a temperature ∼120 °C lower than that over polycrystalline CeO2, which is a novel effective catalyst itself. The high catalytic activity of the nanocrystals was associated with their high concentration of oxygen vacancies. Excellent poisoning resistance was also exhibited by the nanocrystalline CeO2-x samples. These materials have stable activity in the presence of excess CO2.

Copyright

References

Hide All
1. Liu, W. and Flytzani-Stephanopoulos, M., ACS Symposium Series 552, Environmental Catalysis, ed. by Armor, J.N., Ch.31, 375–392, 1994.
2. Bevan, D.J.M. and Kordis, J., J. Inorg. Nucl. Chem. 26, 1509 (1964).
3. Sorensen, O.T., J. Solid State Chem. 18, 217 (1076).
4. Tuller, H.L. and Nowick, A.S., J. Electrochem. Soc. 122 [2], 255 (1975).
5. Tuller, H.L. and Nowick, A.S., J. Electrochem. Soc. 126 [2], 209 (1979).
6. Granqvist, C.G. and Buhrman, R.A., J. Appl. Phys. 47 [5], 2200 (1976).
7. Gleiter, H., Prog. Mater. Sci. 33 [4], 223 (1989).
8. Birringer, R., Herr, U., and Gleiter, H., Trans. Jpn. Inst. Met. 27 suppl., 43 (1987).
9. Tschöpe, A. and Ying, J.Y., submitted to Nanostr. Mater.
10. Liu, W., Sarofim, A.F., and Flytzani-Stephanopoulos, M., Appl. Catal. B, in press.
11. Kochendoerfer, A., Z. Metallkunde 105, 193 (1944).
12. Laachir, A., Perrichon, V., Badri, A., Lamotte, J., Catherine, E., Lavalley, J.C., Fallah, J. El, Hilaire, L., LeNormand, F., Quemere, E., Sauvion, G.N., and Touret, O., J.Chem. Soc. Faraday Trans. 87, 1601 (1991).
13. Tschöpe, A., Ying, J.Y., Amonlirdviman, K., and Trudeau, Michel. L., MRS, Spring Meeting, San Francisco, 1994.
14. Handbook of X-ray photoelecton spectroscopy, Perkin Elmer Corp., p. 203.
15. Yao, H.C. and Yao, Y.F. Yu, J. Catal. 86, 254 (1984).
16. Yamada, T., Kayano, K., and Funabiki, M., in New Aspects Of Spillover Effect In Catalysis, ed. by Inui, T., Fujimoto, K., Uchijima, T., and Masai, M., (Elsevier 1993).
17. Che, M., Kibblewhite, J.F.J., Tench, A.J., Dufaux, M., and Naccache, C., J. Chem. Soc. Faraday Trans. 69, 857 (1973).

Nanocrystalline Doped Cerium Oxide as a Catalyst for SO2 Reduction by Co

  • Andreas Tschöpe (a1), J. Y. Ying (a1), W. Liu (a1) and M. Flytzani-Stephanopoulos (a2)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed