A kinetic and DRIFTS study of supported Pt catalysts for NO oxidation |
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| Authors: | Yaying Ji Todd J. Toops Uschi M. Graham Gary Jacobs Mark Crocker |
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| Affiliation: | (1) Center for Applied Energy Research, University of Kentucky, 2540, Research Park Drive, Lexington, KY 40511, USA;(2) Fuels, Engines and Emissions Research Center, Oak Ridge National Laboratory, 2360, Cherahala Blvd., Knoxville, TN 37932-1563, USA |
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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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| Keywords: | nitric oxide oxidation platinum ceria silica |
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