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Effect of Ceria on the Sulfation and Desulfation Characteristics of a Model Lean NO x Trap Catalyst

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Abstract

The effect of ceria addition on the sulfation and desulfation characteristics of a model Ba-based lean NO x trap (LNT) catalyst was studied. According to DRIFTS and NO x storage capacity measurements, ceria is able to store sulfur during catalyst exposure to SO2, thereby helping to limit sulfation of the main (Ba) NO x storage phase and maintain NO x storage capacity. Temperature programmed desulfation experiments revealed that desulfation of a model ceria-containing catalyst occurred in two stages, corresponding to sulfur elimination from the ceria phase at ~450 °C, followed by sulfur loss from the Ba phase at ~650 °C. Significantly, the ceria-containing catalyst displayed relatively lower sulfur evolution from the Ba phase than its non-ceria analog, confirming that the presence of ceria lessened the degree of sulfur accumulation on the Ba phase.

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Acknowledgments

This publication was prepared with the support of the U.S. Department of Energy, under Award No. DE-FC26-05NT42631. However, any opinions, findings, conclusions, or recommendations expressed herein are those of the authors and do not necessarily reflect the views of the DOE.

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Authors and Affiliations

  1. Center for Applied Energy Research, University of Kentucky, 2540 Research Park Drive, Lexington, KY, 40511, USA

    Yaying Ji & Mark Crocker

  2. Oak Ridge National Laboratory, Fuels, Engines and Emissions Research Center, 2360 Cherahala Blvd., Knoxville, TN, 37932, USA

    Todd J. Toops

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  1. Yaying Ji
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  2. Todd J. Toops
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  3. Mark Crocker
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Correspondence to Mark Crocker.

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Ji, Y., Toops, T.J. & Crocker, M. Effect of Ceria on the Sulfation and Desulfation Characteristics of a Model Lean NO x Trap Catalyst. Catal Lett 127, 55–62 (2009). https://doi.org/10.1007/s10562-008-9759-z

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  • DOI: https://doi.org/10.1007/s10562-008-9759-z

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