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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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