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Ceria-Based Catalysts for Low Temperature NO x Storage and Release

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Abstract

CeO2 promoted with either 1 wt% Pt or 1 wt% Pd was evaluated as a model system for passive NO x adsorber applications. According to NO x storage experiments conducted over the temperature range 80–160 °C, promotion with Pt resulted in higher NO x storage efficiencies than for the Pd-promoted material. However, for NO x storage at 80 and 120 °C, the latter released more NO x below 350 °C during temperature-programmed desorption in relative and absolute terms, the Pt analog releasing most of its stored NO x above 350 °C. DRIFT spectra showed that the use of Pd leads to preferential adsorption of NO x in the form of nitrites, while predominately nitrate formation is observed over the Pt promoted material. Overall, the use of Pd promoted CeO2 is preferred for low temperature NO x storage and release due to its ability to store NO x as thermally labile nitrites.

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Acknowledgments

The authors thank Shelley Hopps for XRD measurements, as well as Drs. Christine Lambert and Joe Theis of Ford Motor Co. for helpful discussions. This project was funded by the National Science Foundation and the U.S. Department of Energy (DOE) under award no. CBET-1258742. 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. Department of Chemistry, University of Kentucky, Lexington, KY, 40506, USA

    Samantha Jones & Mark Crocker

  2. University of Kentucky Center for Applied Energy Research, Lexington, KY, 40511, USA

    Samantha Jones, Yaying Ji & Mark Crocker

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  1. Samantha Jones
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  2. Yaying Ji
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  3. Mark Crocker
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Correspondence to Mark Crocker.

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Jones, S., Ji, Y. & Crocker, M. Ceria-Based Catalysts for Low Temperature NO x Storage and Release. Catal Lett 146, 909–917 (2016). https://doi.org/10.1007/s10562-016-1704-y

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  • DOI: https://doi.org/10.1007/s10562-016-1704-y

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