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Deterioration of Automotive Catalytic Converters (Part 2): Catalytic Performance Characterisation
Technical Paper
2001-01-3695
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This is the second part of a two-part study that compared the degree of deterioration of catalytic converters taken from vehicles with low and high odometer readings. Part two details the catalytic performance characteristics of the catalysts that were physically characterised, according to chemical contamination and thermal degradation, previously in part one. The catalytic activity was determined using engine dynamometer and laboratory tests. The low odometer catalysts showed largely uniform light-off temperatures for CO, HC and NO that were increased in the order of 20 % relative to a new catalyst. The steady state activity was largely unaffected. The dominant deactivation mechanism of these catalysts was found to be the baseline thermal deterioration of the alumina washcoat under normal vehicle operating conditions. The deactivation shown in the high odometer catalysts was highly varied with the greatest loss of activity resulting from exposure to severe thermal conditions. The best performing catalyst in the group showed similar activity to the low odometer group whilst the worst catalyst was totally ineffective due to extreme thermal exposure.
An induced thermal deactivation of a catalyst in the low odometer group was conducted to simulate a prolonged high temperature excursion possible in a vehicle. The result was a large loss of HC conversion activity and a narrowing of the lambda window.
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Authors
- Marcel V. van der Schoot - Materials Research Group, Dept. of Applied Chemistry, RMIT Univ.
- Suresh K. Bhargava - Materials Research Group, Dept. of Applied Chemistry, RMIT Univ.
- Deepak B. Akolekar - Materials Research Group, Dept. of Applied Chemistry, RMIT Univ.
- Karl Föger - Ceramic Fuel Cells Ltd.
- Harry C. Watson - Dept. of Mech. and Manf. Eng., University of Melbourne
Citation
van der Schoot, M., Bhargava, S., Akolekar, D., Föger, K. et al., "Deterioration of Automotive Catalytic Converters (Part 2): Catalytic Performance Characterisation," SAE Technical Paper 2001-01-3695, 2001, https://doi.org/10.4271/2001-01-3695.Also In
SAE 2001 Transactions Journal of Passenger Cars - Mechanical Systems
Number: V110-6; Published: 2002-09-15
Number: V110-6; Published: 2002-09-15
References
- Schafer F. van Basshuysen R. “Reduced Emissions and Fuel Consumption in Automobile Engines” Springer-Verlag/Wien New York 1995
- Taylor K.C. “Automobile Catalytic Converters” Studies in Surface Science and Catalysis Crucq A. Frennet A. Elsevier Amsterdam 1987 30 97
- Federal Office of Road Safety Report on the National In-Service Vehicle Emissions Study “Motor Vehicle Pollution in Australia” May 1996
- van der Schoot M.V. Bhargava S.B. Akolekar D.B. Föger K. Watson H.C. “Deterioration of Automotive Catalytic Converters: Physical Catalyst Characterisation” SAE Paper 2001 SAE 2001-01-3691
- Spindt R.S. “Air Fuel Ratios from exhaust gas analysis” SAE Paper 1965 SAE 650507
- Stenbom B. Smedler G. Nilsson P. Lundgren S. Wirmark G. “Thermal Deactivation of a Three-Way Catalyst: Changes of Structural and Performance Properties” SAE Paper 1990 SAE 900273
- Diwell A.F. Rajaram R.R. Shaw H.A. Truex T.J. “The Role of Ce in Three-Way Catalysts” Studies in Surface Science and Catalysis Crucq A. Frennet A. Elsevier Amsterdam 1991 71 139
- Su E.C. Montreuil C.N. Rothschild W.G. “Ce Oxygen Storage Capacity of Monolith Three-Way Catalysts” Journal of Applied Catalysis 1985 17 75