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Enhanced Low Temperature NO x Reduction Performance Over Bimetallic Pt/Rh–BaO Lean NO x Trap Catalysts

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Abstract

The overall NSR operation was tested over a bimetallic Pt/Rh–BaO lean NO x trap (LNT) catalyst in the range of 473–673 K with simulated diesel exhausts and compared to monometallic 1 wt% Pt/BaO/γ-Al2O3 and 0.5 wt% Rh/BaO/γ-Al2O3 samples. The results showed the beneficial effect of the simultaneous presence of 0.5 wt% Pt and 0.25 wt% Rh on the catalytic performance under lean-burn conditions at low temperatures. It was observed that both Pt/BaO/γ-Al2O3 and Rh/BaO/γ-Al2O3, which both were mildly aged, have limited NO x reduction capacity at 473 K. However, combining Pt and Rh in the NO x storage catalyst assisted the NO x reduction process to occur at lower temperatures (473 K). One possible reason could be that the combined Pt and Rh sample was more resistant to aging. In addition, the NO2-TPD data showed that the presence of Rh into the Pt/BaO/γ-Al2O3 system has a considerable effect on the spill-over process of NO x , accelerating the release of NO x at lower temperatures. These results were in a good agreement with the observed higher rate of oxygen release of the bimetallic Pt/Rh catalyst, leaving a significant number of noble metal sites available for adsorption at lower temperatures than that of the monometallic Pt sample. The superior NSR performance of the bimetallic Pt/Rh/BaO/γ-Al2O3 catalyst under lean-burn conditions suggested the existence of synergetic promotion effect between the Pt and Rh components, increasing the NO x reduction efficiency in comparison with that of the monometallic Pt and Rh–BaO LNT catalysts.

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Acknowledgments

This study has been performed at the Competence Centre for Catalysis in collaboration with Politecnico di Milano. KCK is financially supported by Chalmers University of Technology, the Swedish Energy Agency and the member companies: AB Volvo, Volvo Car Corporation, Scania CV AB, SAAB Powertrain, Haldor Topsoe A/S and The Swedish Space Corporation. We would like to acknowledge the Swedish Energy Agency, Swedish Science Council, Swedish foundation for strategic research (F06-0006) and Chalmers Initiative Transport, for funding.

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Authors and Affiliations

  1. Competence Centre for Catalysis, Chemical Engineering, Chalmers University, 412 96, Göteborg, Sweden

    Stanislava Andonova & Louise Olsson

  2. Laboratory of Catalysis and Catalytic Processes, Dipartimento di Energia, Politecnico di Milano, P.zza Leonardo Da Vinci, 32, 20133, Milan, Italy

    Valentina Marchionni & Luca Lietti

Authors
  1. Stanislava Andonova
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  2. Valentina Marchionni
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  3. Luca Lietti
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  4. Louise Olsson
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Correspondence to Louise Olsson.

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Andonova, S., Marchionni, V., Lietti, L. et al. Enhanced Low Temperature NO x Reduction Performance Over Bimetallic Pt/Rh–BaO Lean NO x Trap Catalysts. Top Catal 56, 68–74 (2013). https://doi.org/10.1007/s11244-013-9931-6

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  • DOI: https://doi.org/10.1007/s11244-013-9931-6

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