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Copper-Cobalt-Cerium Ternary Oxide as an Additive to a Conventional Platinum-Group-Metal Catalyst for Automotive Exhaust Catalysis

Journal Article · · ChemCatChem
 [1];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
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Recently, we reported on a ternary mixed-oxide catalyst that showed low-temperature CO oxidation activity under lean exhaust conditions without inhibition by hydrocarbons such as propene. However, the hydrocarbon oxidation activity of this Cu–Co–Ce (CCC) catalyst cannot be considered as a stand-alone solution to low-temperature automotive exhaust catalysis. To achieve both low-temperature oxidation of pollutants and a reduction in the total platinum-group-metal (PGM) content, we examined a 50 % physical mixture of traditional Pt/Al2O3 and our CCC catalyst in two simulated exhaust protocols. Using this physical mixture, we were able to obtain equivalent or better hydrocarbon activity than the baseline Pt/Al2O3 catalyst with half the total PGM content as well as increased sulfur tolerance for the CCC component of the mixture. Diffuse reflectance infrared Fourier transform spectroscopy data confirmed that despite exposure of sulfur-sensitive CCC to SO2, Cu+-carbonyl binding sites could still be seen if the catalyst was mixed with Pt/Al2O3.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1476435
Alternate ID(s):
OSTI ID: 1420003
Journal Information:
ChemCatChem, Journal Name: ChemCatChem Journal Issue: 6 Vol. 10; ISSN 1867-3880
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English

References (12)

Low‐Temperature CO Oxidation over a Ternary Oxide Catalyst with High Resistance to Hydrocarbon Inhibition journal September 2015
Low-Temperature CO Oxidation over a Ternary Oxide Catalyst with High Resistance to Hydrocarbon Inhibition journal September 2015
The pollutant emissions from diesel-engine vehicles and exhaust aftertreatment systems journal June 2014
Oscillatory CO Oxidation Over Pt/Al2O3 Catalysts Studied by In situ XAS and DRIFTS journal March 2013
Light-off curve of catalytic reaction and kinetics journal March 2002
Automotive exhaust catalysis journal May 2003
Influence of calcination temperature on the structure and catalytic performance of CuOx-CoOy-CeO2 ternary mixed oxide for CO oxidation journal January 2013
Experimental and modeling study of CO and hydrocarbons light-off on various Pt-Pd/γ-Al 2 O 3 diesel oxidation catalysts journal September 2017
Temperature-induced evolution of reaction sites and mechanisms during preferential oxidation of CO journal January 2011
Review of high efficiency and clean reactivity controlled compression ignition (RCCI) combustion in internal combustion engines journal February 2015
Diesel Oxidation Catalysts journal October 2011
Reactivity controlled compression ignition combustion on a multi-cylinder light-duty diesel engine journal April 2012

Figures / Tables (4)

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Figure 2(p. 7)figure Figure 2
Figure 3(p. 8)figure Figure 3
Figure 4(p. 9)figure Figure 4

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY