Characteristics of Pt/WO3/CeO2/ZrO2 Catalysts for catalytic reduction of NO by CO

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Various supported Pt catalysts (Pt/WO3/CeO2/ZrO2; Pt/ZrO2, Pt/CeO2, Pt/CeZrO, Pt/WO3/ZrO2, and Pt/WO3/CeZrO) were prepared and characterized, and their characteristics of catalytic reductions of NO by CO with or without oxygen were investigated. TPR and CO-TPD showed that Pt/CeO2 and Pt/CeZrO could be easily reduced by CO while the reduction by CO was inhibited with the introduction of WO3 in the Case Of Pt/WO3/CeZrO. According to NO-TPD, NO reduction could not proceed over the catalysts (Pt/WO3/CeZrO, Pt/ZrO2, Pt/WO3/ZrO2) to remain in an oxidized state even after reduction by CO, but NO reduction was possible over Pt/CeO2 and Pt/CeZrO catalysts when reduced by CO. For NO + CO reaction without oxygen, those easily reducible catalysts (Pt/CeO2 and Pt/CeZrO) exhibited better catalytic performances. With excess oxygen, however, Pt/WO3/CeZrO and Pt/WO3/ZrO2 catalysts exhibited higher NO conversions to N-2 and N2O especially at a low temperature. The acidity from ZrO2 and WO3 in Pt/WO3/CeO2/ZrO2 catalysts should play an important role on their NO conversion only in the presence of excess oxygen. (C) 2008 Elsevier B.V. All rights reserved.
Publisher
Elsevier Science Bv
Issue Date
2009-02
Language
English
Article Type
Article
Keywords

OXYGEN STORAGE CAPACITY; CEO2-ZRO2 MIXED OXIDES; TUNGSTATED ZIRCONIA; SELECTIVE REDUCTION; SOLID-SOLUTIONS; BEHAVIOR; CH4; PD; SUPPORTS; METHANE

Citation

APPLIED CATALYSIS B-ENVIRONMENTAL, v.86, no.1-2, pp.87 - 92

ISSN
0926-3373
DOI
10.1016/j.apcatb.2008.07.024
URI
http://hdl.handle.net/10203/174333
Appears in Collection
CBE-Journal Papers(저널논문)
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