Four samples from each of two field-aged catalysts subjected to different field test conditions were investigated. The light-off and conversion performance of each sample was measured in a synthetic exhaust flow reactor system. Time-resolved laser IR spectroscopy was used to investigate the catalyst behaviour under transient conditions.Significant differences in light-off temperatures and transient conversion performance between the samples was observed. The samples taken from the inlet side of the monolith were more deactivated than the corresponding ones from the outlet. However, samples taken from peripheral positions always showed better performance than samples originating from the centre.In order to explain observed variations in activity, the following surface properties were examined: oxygen uptake, specific metal area (CO chemisorption), total surface area (BET) and chemical composition (XPS analysis). It was concluded that thermal deactivation was mainly responsible for the difference between peripheral and central positions while the poisoning due to S, Pb and P had the largest effect on the inlet samples.The total conversion efficiency, as measured by FTP75 tests, was compared to the results from laboratory activity tests and catalyst charactarization data. The mechanisms of ageing and the effect on emissions were correlated to the laboratory results from this study.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Spatially Resolved Effects of Deactivation on Field-Aged Automotive Catalysts


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    International Congress & Exposition ; 1991



    Publication date :

    1991-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Spacially resolved effects of deactivation on field-aged automotive catalysts

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


    Techniques for Analyzing Thermal Deactivation of Automotive Catalysts

    Peters, C. R. / Graham, G. W. / Gandhi, H. S. et al. | SAE Technical Papers | 1992


    Thermal and chemical deactivation of three-way catalysts: comparison of road-aged, fuel-cut aged and SAI-aged catalysts

    Fathali,A. / Wallin,F. / Kristoffersson,A. et al. | Automotive engineering | 2015


    Evaluation of Spatially Resolved Performance of NOx Adsorber Catalysts

    Yezerets, Aleksey / Chen, Hai-Ying / Hess, Howard S. et al. | SAE Technical Papers | 2009


    Thermal and Chemical Deactivation of Three-Way Catalysts: Comparison of Road-, Fuel-Cut and SAI- Aged Catalysts

    Fathali, Anna / Kristoffersson, Annika / Wallin, Fredrik et al. | SAE Technical Papers | 2015