Elsevier

Journal of Catalysis

Volume 158, Issue 1, January 1996, Pages 102-108
Journal of Catalysis

Regular Article
Platinum/Ceria CO Oxidation Catalysts Derived from Pt/Ce Crystalline Alloy Precursors

https://doi.org/10.1006/jcat.1996.0011Get rights and content

Abstract

Pt/Ce alloys treated with O2, N2O, or CO/H2yield Pt/ceria catalysts that are active for CO oxidation. The most active catalysts are produced by N2O treatment of Pt3Ce7at 720 K, which leads to the highest dispersion of both the Pt and ceria phases. This reflects the smaller exotherm, which occurs with N2O, apparently a critical requirement for production of a highly active catalyst. The performance of these Pt3Ce7-derived catalysts is comparable with that of the best, recently announced, materials prepared by wet chemical techniques. In all cases, most of the active material is invisible to X-ray diffraction and the catalysts exhibit very low CO-titratable Pt area (<0.05 CO/Pt). Prereduction in H2at 570 K greatly enhances the reactivity of a given catalyst. CO TPR shows that highest activity correlates with a reduction state at ∼510 K, suggesting metal-promoted CO oxidation by the ceria. It seems possible that this high activity is associated with ceria spillover onto Pt, the spillover being facilitated by atomic-level mixing of Pt and Ce in the alloy precursor.

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