Catalysis Letters

, Volume 110, Issue 1, pp 29–37

A kinetic and DRIFTS study of supported Pt catalysts for NO oxidation

  • Yaying Ji
  • Todd J. Toops
  • Uschi M. Graham
  • Gary Jacobs
  • Mark Crocker
Article

DOI: 10.1007/s10562-006-0100-4

Cite this article as:
Ji, Y., Toops, T.J., Graham, U.M. et al. Catal Lett (2006) 110: 29. doi:10.1007/s10562-006-0100-4

Abstract

NO oxidation was studied over Pt/CeO2 and Pt/SiO2 catalysts. Apparent activation energies (Ea) of 31.4 and 40.6 kJ/mole were determined for Pt/CeO2 and Pt/SiO2, respectively, while reaction orders for NO and O2 were fractional and positive for both catalysts. Pre-treatment of the catalysts with SO2 caused a decrease in the Ea values, while the reaction orders were only slightly changed. In situ DRIFTS measurements indicated that high concentrations of nitrate species were formed on the surface of Pt/CeO2 during NO oxidation, while almost no surface species could be detected on Pt/SiO2. The addition of SO2 resulted in the formation of a highly stable sulfate at the expense of nitrate species and caused an irreversible loss of catalytic activity for Pt/CeO2.

Keywords

nitric oxide oxidation platinum ceria silica 

Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  • Yaying Ji
    • 1
  • Todd J. Toops
    • 2
  • Uschi M. Graham
    • 1
  • Gary Jacobs
    • 1
  • Mark Crocker
    • 1
  1. 1.Center for Applied Energy ResearchUniversity of KentuckyLexingtonUSA
  2. 2.Fuels, Engines and Emissions Research CenterOak Ridge National LaboratoryKnoxvilleUSA

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