Nanocrystalline doped cerium oxide as a catalyst for SO{sub 2} reduction by CO
Book
·
OSTI ID:106177
- Massachusetts Inst. of Tech., Cambridge, MA (United States). Dept. of Chemical Engineering
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 SO{sub 2} reduction by CO. Nanocrystalline CeO{sub 2{minus}x}, La-doped CeO{sub 2{minus}x}, and Cu-doped CeO{sub 2{minus}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 CeO{sub 2{minus}x} materials were found to be excellent catalysts for complete SO{sub 2} conversion to elemental sulfur. Undoped nanocrystalline CeO{sub 2{minus}x} enabled light-off at 460 C, a temperature {approximately} 120 C lower than that over polycrystalline CeO{sub 2}, 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 CeO{sub 2{minus}x} samples. These materials have stable activity in the presence of excess CO{sub 2}.
- DOE Contract Number:
- FG22-92PC92534
- OSTI ID:
- 106177
- Report Number(s):
- CONF-940411--; ISBN 1-55899-239-1
- Country of Publication:
- United States
- Language:
- English
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