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A Kinetic and DRIFTS Study of Supported Pt Catalysts for NO Oxidation

Journal Article · · Catalysis Letters
OSTI ID:930819
 [1];  [2];  [3];  [3];  [3]
  1. ORNL
  2. CAER-UK
  3. University of Kentucky
+ Show Author Affiliations

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.

Research Organization:
Oak Ridge National Laboratory (ORNL); Fuels, Engines and Emissions Research Center
Sponsoring Organization:
ME USDOE - Office of Management, Budget, and Evaluation; ORNL work for others
DOE Contract Number:
AC05-00OR22725
OSTI ID:
930819
Journal Information:
Catalysis Letters, Journal Name: Catalysis Letters Journal Issue: 1-2 Vol. 110; ISSN CALEER; ISSN 1011-372X
Country of Publication:
United States
Language:
English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
ACTIVATION ENERGY
CATALYST SUPPORTS
CATALYTIC EFFECTS
CERIUM OXIDES
CHEMICAL REACTION KINETICS
NITRIC OXIDE
OXIDATION
PLATINUM
SILICON OXIDES
SULFUR DIOXIDE