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.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Techniques for Analyzing Thermal Deactivation of Automotive Catalysts


    Additional title:

    Sae Technical Papers


    Contributors:
    Peters, C. R. (author) / Graham, G. W. (author) / Gandhi, H. S. (author) / Usmen, R. K. (author) / McCabe, R. W. (author) / Weber, W. H. (author)

    Conference:

    International Fuels & Lubricants Meeting & Exposition ; 1992



    Publication date :

    1992-10-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Spatially Resolved Effects of Deactivation on Field-Aged Automotive Catalysts

    Romare, Anders / Jobson, Edward / Högberg, Erik et al. | SAE Technical Papers | 1991


    Spacially resolved effects of deactivation on field-aged automotive catalysts

    Smedler,G. / Lundgren,S. / Jobson,E. et al. | Automotive engineering | 1991


    Raman Studies of Automotive Catalyst Deactivation

    O'Neill, Ann E. / Uy, Dairene | SAE Technical Papers | 2006


    Raman studies of automotive catalyst deactivation

    Uy,D. / ONeill,A.E. / Ford Motor,US | Automotive engineering | 2006


    Modes of Deactivation of Exhaust Purification Catalysts

    Breder, E. W. / Erickson, H. / Mooi, J. et al. | SAE Technical Papers | 1974