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Chapitre D'ouvrage Année : 2007

The Role of Cerium-based Oxides used as Oxygen Storage Materials in DeNOx Catalysis

Nicolas Bion
Patrice Marecot
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  • PersonId : 849721
Daniel Duprez
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Résumé

Materials with high ‘oxygen storage capacity’ (OSC) are now widely used in automotive converter catalysts. They are mainly composed of Ce-based oxides (CeZrOx, CeZrPrOx, etc.) having both multiple cationic valencies and oxygen vacancies. These properties allow the catalyst to store active O species (O2−, superoxide, etc.) in O2 excess and to release them when the O2 concentration in gas phase decreases or becomes nil. After having briefly examined the main properties of these OSC materials and the methods employed for their characterization, their impact in automotive catalysis will be reviewed, with a special insight in DeNOx catalysis: (1) in three-way catalysis (2) in automotive catalysis under lean conditions (lean-burn spark ignition engine and diesel).

Domaines

Catalyse
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Dates et versions

hal-00300635 , version 1 (27-01-2021)

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Xavier Courtois, Nicolas Bion, Patrice Marecot, Daniel Duprez. The Role of Cerium-based Oxides used as Oxygen Storage Materials in DeNOx Catalysis. P. Granger; V.I. Pârvulescu. Past and Present in DeNOx catalysis. From Molecular Modelling to Chemical Engineering, 171 (8), Elsevier, pp.235-259, 2007, Studies in Surface Science and Catalysis, 978-0-444-53058-5. ⟨10.1016/S0167-2991(07)80209-6⟩. ⟨hal-00300635⟩

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