Thermally-induced microstructural changes in a three-way automotive catalyst

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The use of advanced electron microscopy techniques to characterize both the bulk and near-atomic level microstructural evolution of catalyst materials during different dynamometer/vehicle aging cycles is an integral part of understanding catalyst deactivation. The study described here was undertaken to evaluate thermally-induced microstructural changes which caused the progressive loss of catalyst performance in a three-way automotive catalyst. Several different catalyst processing variables, for example changing the washcoat ceria content, were also evaluated as a function of aging cycle and thermal history. A number of thermally-induced microstructural changes were identified using high resolution electron microscopy techniques that contributed to the deactivation ... continued below

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10 p.

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More, K.L.; Kenik, E.A.; Coffey, D.W.; Geer, T.S.; Theis, J.; LaBarge, W. et al. December 1, 1997.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this article can be viewed below.

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Description

The use of advanced electron microscopy techniques to characterize both the bulk and near-atomic level microstructural evolution of catalyst materials during different dynamometer/vehicle aging cycles is an integral part of understanding catalyst deactivation. The study described here was undertaken to evaluate thermally-induced microstructural changes which caused the progressive loss of catalyst performance in a three-way automotive catalyst. Several different catalyst processing variables, for example changing the washcoat ceria content, were also evaluated as a function of aging cycle and thermal history. A number of thermally-induced microstructural changes were identified using high resolution electron microscopy techniques that contributed to the deactivation of the catalyst, including sintering of all washcoat constituents, {gamma}-alumina transforming to {alpha}-, {beta}-, and {delta}-alumina, precious metal redistribution, and constituent encapsulation. The data accumulated in this study have been used to correlate microstructural evolution with thermal history and catalyst performance during various aging cycles and to subsequently evaluate different washcoat formulations for increased thermal stability.

Physical Description

10 p.

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OSTI as DE98000794

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  • 1997 Society of Automotive Engineers fuels and lubricants meeting and expo, Tulsa, OK (United States), 13-16 Oct 1997

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  • Other: DE98000794
  • Report No.: ORNL/CP--95239
  • Report No.: CONF-971026--
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 554762
  • Archival Resource Key: ark:/67531/metadc698209

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  • December 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Jan. 25, 2016, 6:14 p.m.

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More, K.L.; Kenik, E.A.; Coffey, D.W.; Geer, T.S.; Theis, J.; LaBarge, W. et al. Thermally-induced microstructural changes in a three-way automotive catalyst, article, December 1, 1997; Tennessee. (digital.library.unt.edu/ark:/67531/metadc698209/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.