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Evaluation of Mn and Sn-Modified Pd-Ce-Based Catalysts for Low-Temperature Diesel Exhaust Oxidation

Journal Article · · Emission Control Science & Technology
 [1];  [2];  [2];  [1];  [1]
  1. Univ. of South Carolina, Columbia, SC (United States). SmartState Center for Strategic Approaches to the Generation of Electricity (SAGE), Dept. of Chemical Engineering
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Fuels, Engines, and Emissions Research Center
Pd-impregnated Ce-based catalysts were tested for carbon monoxide (CO) and hydrocarbon (HC) oxidation under challenging low-temperature diesel combustion conditions. The results indicate that the light-off temperatures for CO over Pd/CeO2, Pd/MnOx-CeO2 (Pd/MC), and Pd/SnO2-MnOx-CeO2 (Pd/SMC) catalysts shift to higher temperatures in the presence of simulated diesel exhaust gas. The lowest T50 for CO is observed over Pd/MC at 173 °C, whereas Pd/CeO2 is shown to oxidize most of the HCs at temperatures below 400 °C. In all catalysts, the oxidation of HCs starts right after the onset of CO oxidation, revealing that the competitive adsorption of CO, NO, and alkenes controls the catalytic activity. Further evaluation of the catalytic activity in the presence of only CO and C3H6 reveals the immediate inhibiting effect of C3H6 at catalyst temperatures below 150 °C. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) experiments performed over Pd/CeO2, Pd/MC, and Pd/SMC show that C3H6 inhibits the formation of carbonyl species on Pdn+ sites, which limits the catalytic activity for CO. Lastly, such inhibition is observed on all supports, implying that the activity is independent of oxygen storage capacity (OSC) or lattice oxygen reducibility of the supports in the presence of C3H6.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Fuels, Engines and Emissions Research Center; Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). National Transportation Research Center (NTRC)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1356945
Journal Information:
Emission Control Science & Technology, Journal Name: Emission Control Science & Technology Journal Issue: 1 Vol. 3; ISSN 2199-3629
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Bulk Versus Surface Modification of Alumina with Mn and Ce Based Oxides for CH4 Catalytic Combustion journal May 2019
In situ spectroscopic investigation of a Pd local structure over Pd/CeO 2 and Pd/MnO x –CeO 2 during CO oxidation journal January 2017

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