Techniques for Analyzing Thermal Deactivation of Automotive Catalysts 922336
Automotive three-way catalysts (TWC) were characterized using temperature-programmed reduction (TPR), x-ray diffraction (XRD), Raman spectroscopy, chemisorption measurements and laboratory activity measurements. Capabilities and limitations of these standard analytical techniques for the characterization of production-type automotive catalysts are pointed out. With the exception of chemisorption techniques, all appear to have general utility for analyzing exhaust catalysts. The techniques were used to show that the noble metals and ceria in fresh Pt/Rh and Pd/Rh catalysts are initially highly dispersed and contain a mixture of interacting and non-interacting species. Thermal aging of these catalysts (in the reactor or vehicle) caused both precious metal and ceria particles to sinter, thereby decreasing the interaction between the two.
Citation: Usmen, R., McCabe, R., Graham, G., Weber, W. et al., "Techniques for Analyzing Thermal Deactivation of Automotive Catalysts," SAE Technical Paper 922336, 1992, https://doi.org/10.4271/922336. Download Citation
Author(s):
R. K. Usmen, R. W. McCabe, G. W. Graham, W. H. Weber, C. R. Peters, H. S. Gandhi
Affiliated:
Ford Motor Co.
Pages: 13
Event:
International Fuels & Lubricants Meeting & Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Automotive Emissions and Catalyst Technology-SP-0938, SAE 1992 Transactions: Journal of Fuels & Lubricants-V101-4
Related Topics:
Three-way catalysts
Catalysts
Particulate matter (PM)
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