CO oxidation over promoted Pt catalysts

A study of CO oxidation by O2 over Pt catalysts, promoted by MnOx and CoOx, is described. The activities of Pt/SiO2, Pt/MnOx/SiO2 and Pt/CoOx/SiO2 are compared with commercial Pt/Al2O3, Pt/Rh/Al2O3 and Pt/CeOx/Al2O3 catalysts. Since these catalysts differ in dispersion and weight loading of platinum...

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Bibliographic Details
Published inApplied catalysis. B, Environmental Vol. 10; no. 4; pp. 245 - 261
Main Authors Mergler, Y.J., van Aalst, A., van Delft, J., Nieuwenhuys, B.E.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 03.12.1996
Subjects
Activity
Ageing
CO oxidation
Pt-only catalyst
Activity
Models
Pt-only catalyst
CO oxidation
Ageing
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Summary:A study of CO oxidation by O2 over Pt catalysts, promoted by MnOx and CoOx, is described. The activities of Pt/SiO2, Pt/MnOx/SiO2 and Pt/CoOx/SiO2 are compared with commercial Pt/Al2O3, Pt/Rh/Al2O3 and Pt/CeOx/Al2O3 catalysts. Since these catalysts differ in dispersion and weight loading of platinum, the turnover frequencies are also compared. The following order in activity in CO oxidation after a reductive pretreatment is found: Pt/CoOx/SiO2 > Pt/MnOx/SiO2, Pt/CeOx/Al2O3 > Pt/Al2O3, Pt/Rh/Al2O3, Pt/SiO2. Over Pt/CoOx/SiO2 CO is already oxidised at room temperature. Possible models to account for the high activity of Pt/CoOx/SiO2 in the CO/O2 reaction are presented and discussed. Partially reduced metal oxides are necessary to increase the activity of the Pt/CoOx/SiO2, Pt/MnOx/SiO2 or Pt/CeOx/Al2O3 catalysts. It was shown that mild ageing treatments did not affect the activity of the Pt/CoOx/SiO2 catalyst in CO oxidation.
ISSN:0926-3373
1873-3883
DOI:10.1016/S0926-3373(96)00017-3