Copper-Cobalt-Cerium Ternary Oxide as an Additive to a Conventional Platinum-Group-Metal Catalyst for Automotive Exhaust Catalysis
Abstract 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/Al 2 O 3 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/Al 2 O 3 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 SO 2 , Cu + ‐carbonyl binding sites could still be seen if the catalyst was mixed with Pt/Al 2 O 3 .
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC05-00OR22725; AC0500OR22725
- OSTI ID:
- 1476435
- Alternate ID(s):
- OSTI ID: 1420003
- Journal Information:
- ChemCatChem, Vol. 10, Issue 6; ISSN 1867-3880
- Publisher:
- ChemPubSoc EuropeCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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