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.
Techniques for Analyzing Thermal Deactivation of Automotive Catalysts
Sae Technical Papers
International Fuels & Lubricants Meeting & Exposition ; 1992
1992-10-01
Conference paper
English
Spatially Resolved Effects of Deactivation on Field-Aged Automotive Catalysts
SAE Technical Papers | 1991
|Spacially resolved effects of deactivation on field-aged automotive catalysts
Automotive engineering | 1991
|Raman Studies of Automotive Catalyst Deactivation
SAE Technical Papers | 2006
|Raman studies of automotive catalyst deactivation
Automotive engineering | 2006
|Modes of Deactivation of Exhaust Purification Catalysts
SAE Technical Papers | 1974
|