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

Published online by Cambridge University Press:  15 February 2011

Andreas Tschöpe ,
J. Y. Ying ,
W. Liu  and
M. Flytzani-Stephanopoulos
Andreas Tschöpe
Affiliation:
Massachusetts Institute of Technology, Depart of Chemical Engineering, Cambridge MA 02139.
J. Y. Ying
Affiliation:
Massachusetts Institute of Technology, Depart of Chemical Engineering, Cambridge MA 02139.
W. Liu
Affiliation:
Massachusetts Institute of Technology, Depart of Chemical Engineering, Cambridge MA 02139.
M. Flytzani-Stephanopoulos
Affiliation:
Permanent Address: Tufts University, Department of Chemical Engineering, Medford, MA 02155.
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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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 344: Symposium I – Materials and Processes for Environmental Protection , 1994 , 133
Copyright
Copyright © Materials Research Society 1994

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References

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