Is oxygen storage in three-way catalysts an equilibrium controlled process?

Roman Möller; Martin Votsmeier; Christopher H. Onder; Lino Guzzella; Jürgen Gieshoff

doi:https://doi.org/10.1016/j.apcatb.2009.05.003

doi.org/10.1016/j.apcatb.2009.05.003

Is oxygen storage in three-way catalysts an equilibrium controlled process?

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..., Jürgen Gieshoff

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Applied Catalysis B: Environmental22.10

Volume: 91, Issue: 1-2, Pages: 30 - 38

Published: Sep 1, 2009

Abstract

Existing reaction mechanisms for three-way catalysts ignore the oxidation of Ce2O3 by H2O or CO2 and therefore treat oxygen storage on ceria as a kinetically controlled non-equilibrium process. Such mechanisms do not correctly reproduce a number of practically important phenomena. Based on transient concentration step experiments, this paper demonstrates that the oxidation of reduced ceria by H2O or CO2 plays an important role for the...