This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Deterioration of Three-Way Automotive Catalysts, Part II - Oxygen Storage Capacity at Exhaust Conditions
Annotation ability available
Sector:
Language:
English
Abstract
Catalysts aged under different on-road conditions were analysed with respect to their conversion of CO and HC at step changes of the synthetic exhaust gas composition. Time resolved diode laser spectroscopy and fast response FID analysis were used to characterise the catalyst response to transient changes of CO and hydrocarbons in the exhaust gas. The oxygen storage capacity was monitored at various conditions; flow rate, catalyst temperature, previous exposure to oxidizing or reducing atmosphere and amplitude of the perturbation.
The technique appeared to provide a sensitive probe for analysis of the dynamic oxygen storage capacity of new and aged catalysts at exhaust like conditions. The results correlate well with the transient emission performance during vehicle tests.
Further, surface characterization using SEM/EDS and XPS techniques indicated that phosphate formation was the most probable cause of deactivation. A strong relationship between phosphate content and catalyst performance properties was found. The possible nature of this phosphorous deactivation function is discussed.
Recommended Content
Authors
Citation
Smedler, G., Eriksson, S., Lindblad, M., Bernler, H. et al., "Deterioration of Three-Way Automotive Catalysts, Part II - Oxygen Storage Capacity at Exhaust Conditions," SAE Technical Paper 930944, 1993, https://doi.org/10.4271/930944.Also In
References
- Jobson, E. Laurell, M. Högberg, E. Bernler, H. Lundgren, S. Wirmark, G. Smedler, G. SAE93, Part I of this work
- Jobson, E. Höberg, E. Weber, K.H Smedler, G. Lundgren, S. Romare, A. Wirmark, G. SAE-paper 910173
- Lundgren, S Spiess, G. Jobson, E. Smedler, G
- Le Normand, F. Hillaire, L. Kili, K. Krill, G. Maire, G J. Phys. Chem 92 2561 1988
- Lööf, P. Kasemo, B. Björnkvist, L. Andersson, S. Frestad, A. 253 “Catalysis and Automotive Pollution Control II” Crucq A Elsevier 1991
- Diwell, A.F Rajaram, R.R Shaw, H.A Truex, T.J 139 “Catalysis and Automotive Pollution Control II” Crucq A Elsevier 1991
- Engler, B. Koberstein, E. Schubert, P. Applied Catalysis 48 1989 71 92
- Niklasson Claes Doctoral Thesis Chalmers University of Technology Göteborg, Sweden 1988
- Weibel, M Garin, F Bernhardt, P Maire, G Prigent, M 195 “Catalysis and Automotive Pollution Control II” Crucq A Elsevier 1991
- Pealvin M. Hendrichsson D. Hollander J Jolly W J. Chem. Phys 74 116 1970