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Carbon Filament Growth on Fully Formulated Pd/Rh Automotive Catalysts

Published online by Cambridge University Press:  02 July 2020

J.W. Hangas ,
G.W. Graham ,
R.W. McCabe  and
W. Chun
J.W. Hangas
Affiliation:
Ford Research Laboratories, MD 3182, PO Box 2053, Dearborn, MI48121-2053
G.W. Graham
Affiliation:
Ford Research Laboratories, MD 3182, PO Box 2053, Dearborn, MI48121-2053
R.W. McCabe
Affiliation:
Ford Research Laboratories, MD 3182, PO Box 2053, Dearborn, MI48121-2053
W. Chun
Affiliation:
Ford Research Laboratories, MD 3182, PO Box 2053, Dearborn, MI48121-2053
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Extract

Automotive exhaust catalysts are typically operated under stoichiometric conditions to minimize nitrogen oxide, hydrocarbon, and carbon monoxide pollutants. These catalysts do not form carbon filaments under normal operating conditions. In development of catalysts, however, a stabilization procedure is sometimes utilized on used catalysts (dynamometer or vehicle) to purge the catalyst of sulfur prior to measuring the catalytic activity in sweep and light-off testing. The stabilization procedure consists of running the catalyst under rich (excess fuel) conditions for 0.5hr. This study documents the existence of carbon filaments due to the stabilization procedure and discusses the effect of filaments on subsequent testing.

Two separate catalysts were used in this study. The first was a 50,000 mile vehicle aged catalyst that had also been through the stabilization procedure and then sweep and light-off tested. The other was only dynamometer aged for 120hr at 850°C (1560°F).

Type
Sir John Meurig Thomas Symposium: Microscopy and Microanalysis in the Chemical Sciences
Information
Microscopy and Microanalysis , Volume 6 , Issue S2: Proceedings: Microscopy & Microanalysis 2000, Microscopy Society of America 58th Annual Meeting, Microbeam Analysis Society 34th Annual Meeting, Microscopical Society of Canada/Societe de Microscopie de Canada 27th Annual Meeting, Philadelphia, Pennsylvania August 13-17, 2000 , August 2000 , pp. 66 - 67
Copyright
Copyright © Microscopy Society of America

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References

1.Baker, R.T.K., “Catalytic Growth of Carbon Filaments,” Carbon, 27[3]315–323(1989).CrossRefGoogle Scholar
2.Leszek, Kepinski, “Carbon deposition in Pd/CeO2 catalyst: TEM study,” Catalyst Today 50(1999)237–245.Google Scholar