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Effects of CO on Pd/BEA Passive NOx Adsorbers

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Abstract

Cold-start emissions significantly contribute to total vehicular pollutant emission profiles. There has therefore been a significant amount of research focused on catalytic aftertreatment systems that can mitigate CO, hydrocarbon and NOx emissions at low temperatures. Recently, passive NOx adsorbers (PNAs) have been developed, and these can store or trap NOx at low temperature and are designed to release the trapped NOx at higher temperature ranges, where downstream NOx reduction catalysts are active. Pd/BEA is reported to be one such PNA. In this study its NOx storage at low temperatures and release at higher temperatures was characterized using temperature programmed (TP) experiments and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The influence of CO was investigated and was shown to improve the amount stored at low temperature and also induce higher temperature desorption, in a range that is applicable for downstream NOx reduction. Without the reductant, NOx release primarily occurred at temperatures too low to be practically relevant.

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Acknowledgements

We thank Cummins Inc. for financial support and Yasser Jangjou for fruitful discussions regarding zeolites.

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Authors and Affiliations

  1. Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX, USA

    Anh Vu

  2. Catalyst Technology, Cummins Inc, Columbus, INM, USA

    Jinyong Luo & Junhui Li

  3. Department of Chemical Engineering, University of Virginia, Charlottesville, VA, USA

    William S. Epling

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  1. Anh Vu
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  2. Jinyong Luo
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  3. Junhui Li
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  4. William S. Epling
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Correspondence to William S. Epling.

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Vu, A., Luo, J., Li, J. et al. Effects of CO on Pd/BEA Passive NOx Adsorbers. Catal Lett 147, 745–750 (2017). https://doi.org/10.1007/s10562-017-1976-x

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  • DOI: https://doi.org/10.1007/s10562-017-1976-x

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