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Topics in Catalysis

, Volume 58, Issue 14–17, pp 961–970 | Cite as

The Effect of Phosphorus Exposure on Diesel Oxidation Catalysts—Part I: Activity Measurements, Elementary and Surface Analyses

  • Marja KärkkäinenEmail author
  • Tanja Kolli
  • Mari Honkanen
  • Olli Heikkinen
  • Mika Huuhtanen
  • Kauko Kallinen
  • Toivo Lepistö
  • Jouko Lahtinen
  • Minnamari Vippola
  • Riitta L. Keiski
Original Paper

Abstract

The effects of phosphorus poisoning on the activity of PtPd and Pt diesel oxidation catalysts and on the activity of the support material were investigated using the gas phase laboratory-scale-aging procedure. The catalysts were treated using two different phosphorus concentrations (0.065 and 0.13 mol/L (NH4)2HPO). The deactivation was studied by inductively coupled plasma optical emission spectroscopy, electron microscopy, X-ray diffractometry, X-ray photoelectron spectrometry and Fourier-transform infrared reflectance, N2-physisorption, and activity measurements with CO, C3H6 and NO. The amount of accumulated phosphorus was higher on the Pt catalyst surface than on the PtPd catalyst and significantly higher on the surface of the bare support material. Phosphorus concentration was uniform throughout the support layer (down to the 10 μm), and phosphorus was found as phosphate, although it can also form compounds like AlPO4 with the support. The treatment with low phosphorus concentration was found to have a clear deactivation effect only for C3H6 oxidation activity on PtPd catalysts above 200 °C. The treatment with high phosphorus concentration significantly decreased the activity of both the PtPd and Pt catalysts. In particular, the C3H6 and NO oxidation activities of the fresh and P-treated Pt catalysts were higher than those of the PtPd catalysts for the entire temperature range.

Keywords

Phosphorus Deactivation Poisoning Diesel oxidation catalyst Platinum Palladium 

Notes

Acknowledgments

Financial support from The Academy of Finland (ACABIO 139187) is gratefully acknowledged. F. Cumming is acknowledged for his contribution to the experimental work.

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Marja Kärkkäinen
    • 1
    Email author
  • Tanja Kolli
    • 1
  • Mari Honkanen
    • 2
  • Olli Heikkinen
    • 3
  • Mika Huuhtanen
    • 1
  • Kauko Kallinen
    • 4
  • Toivo Lepistö
    • 2
  • Jouko Lahtinen
    • 3
  • Minnamari Vippola
    • 2
  • Riitta L. Keiski
    • 1
  1. 1.Environmental and Chemical Engineering, Faculty of TechnologyUniversity of OuluOuluFinland
  2. 2.Department of Materials ScienceTampere University of TechnologyTampereFinland
  3. 3.Department of Applied PhysicsAalto UniversityAaltoFinland
  4. 4.Catalyst ResearchDinex Ecocat OyOuluFinland

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