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Observations on the Aging Environment Dependent NO Oxidation Activity of Model Pt/Al2O3 Diesel Oxidation Catalyst

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Abstract

The influence of aging environment of model diesel oxidation catalyst Pt/Al2O3 on the NO oxidation activity is studied. The fresh catalyst Pt/Al/F (calcined in air at 500 °C) is aged with or without phosphorus (P) poisoning (7.5 wt%) at 800 °C either in air (P/Pt/Al/O or Pt/Al/O) or in simulated diesel exhaust (P/Pt/Al/R or Pt/Al/R). Catalyst aged under diesel exhaust environment (Pt/Al/R) surprisingly presents the best NO oxidation activity under excess of O2 followed by the fresh (Pt/Al/F) and thermally aged (Pt/Al/O) catalysts. The activity difference between the catalysts is quite large, especially between Pt/Al/R and Pt/Al/O that are aged at the same temperatures but under different environments suggesting the importance of the aging environment for the catalytic activity. The NO oxidation activity of P poisoned catalysts P/Pt/Al/R and P/Pt/Al/O is minute as compared to their P free counter parts indicating that chemical aging is more detrimental for catalytic efficiency than thermal aging.

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Acknowledgments

The authors are thankful to Empa for financial support and the Swiss National Science Foundation for funding ASAP2020 equipment within the R’Equip program (project No. 206021_128741/1).

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Authors and Affiliations

  1. Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Solid State Chemistry and Catalysis, Ueberlandstrasse 129, 8600, Dübendorf, Switzerland

    Santhosh Kumar Matam, A. Weidenkaff & D. Ferri

  2. Empa, Swiss Federal Laboratories for Materials Science and Technology, Internal Combustion Engines Laboratory, Ueberlandstrasse 129, 8600, Dübendorf, Switzerland

    A. Winkler

Authors
  1. Santhosh Kumar Matam
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  2. A. Winkler
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  3. A. Weidenkaff
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  4. D. Ferri
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Correspondence to Santhosh Kumar Matam.

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Matam, S.K., Winkler, A., Weidenkaff, A. et al. Observations on the Aging Environment Dependent NO Oxidation Activity of Model Pt/Al2O3 Diesel Oxidation Catalyst. Top Catal 56, 329–332 (2013). https://doi.org/10.1007/s11244-013-9975-7

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  • DOI: https://doi.org/10.1007/s11244-013-9975-7

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