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

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Abstract

NO oxidation was studied over Pt/CeO2 and Pt/SiO2 catalysts. Apparent activation energies (E a) 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 E a 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.

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Authors and Affiliations

  1. Center for Applied Energy Research, University of Kentucky, 2540, Research Park Drive, Lexington, KY, 40511, USA

    Yaying Ji, Uschi M. Graham, Gary Jacobs & Mark Crocker

  2. Fuels, Engines and Emissions Research Center, Oak Ridge National Laboratory, 2360, Cherahala Blvd., Knoxville, TN, 37932-1563, USA

    Todd J. Toops

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  1. Yaying Ji
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  2. Todd J. Toops
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Correspondence to Mark Crocker.

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Ji, Y., Toops, T.J., Graham, U.M. et al. A kinetic and DRIFTS study of supported Pt catalysts for NO oxidation. Catal Lett 110, 29–37 (2006). https://doi.org/10.1007/s10562-006-0100-4

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  • DOI: https://doi.org/10.1007/s10562-006-0100-4

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