Some Insight into the Effects of Oxygen Diffusion in the Reduction Kinetics of Ceria

The aim of this paper is to discuss the main features of the temperature-programmed reduction of high-surface-area ceria in the low-temperature range (T < 900 K) with particular emphasis on the role of oxygen diffusion. By making use of a cell model for the reaction/diffusion process, it is shown...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 2001-10, Vol.40 (22), p.4828-4835
Main Authors: Giordano, Francesca, Trovarelli, Alessandro, de Leitenburg, Carla, Dolcetti, Giuliano, Giona, Massimiliano
Format: Article
Language:English
Subjects:
Catalysis
Catalysts: preparations and properties
Chemistry
Exact sciences and technology
General and physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:The aim of this paper is to discuss the main features of the temperature-programmed reduction of high-surface-area ceria in the low-temperature range (T < 900 K) with particular emphasis on the role of oxygen diffusion. By making use of a cell model for the reaction/diffusion process, it is shown that the observed kinetics is not influenced by oxygen diffusion within the lattice for the values of oxygen diffusivity available for ceria. This result enables us to develop a simple and spatially uniform kinetic model for ceria reduction. The effects of sintering and surface area are also briefly addressed.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie010105q