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Advances in Durability and Performance of Ceramic Preconverter Systems
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1995 by SAE International in United States
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Ceramic preconverters have become a viable strategy to meet the California LEV and ULEV standards. To minimize cold start emissions the preconverter must light-off quickly and be catalytically efficient. In addition, it must also survive the more severe thermomechanical requirements posed by its close proximity to the engine. The viability of the ceramic preconverter system to meet both emissions and durability requirements has also been reported recently(1,2). This paper further investigates the impact preconverter design parameters such as cell density, composition, volume, and catalyst technology have on emissions and pressure drop. In addition, different preconverter/main converter configurations in conjunction with electrically heated catalyst systems are evaluated. The results demonstrate that ceramic preconverters substantially reduce cold start emissions. Their effectiveness depends on preconverter design and volume, catalyst technology, and the system configuration.
The preconverter durability is evaluated by both on-vehicle testing and hot vibration testing. Eight preconverters, following aging for 160,000 km on 3.0 and 4.0 liter vehicles, showed no significant degradation in their mechanical integrity with only minimal degradation of the catalytic activity. In addition, advanced packaging designs have extended the life of the ceramic preconverter system to nearly 100 hours in limited hot vibration testing at 75 g's, 185 Hz with an inlet gas temperature of 900°C.
|Technical Paper||Design Considerations for a Ceramic Preconverter System|
|Technical Paper||Analyses of Thermal Shock Failure on Large Volume DPF|
CitationSocha, L., Gulati, S., Locker, R., Then, P. et al., "Advances in Durability and Performance of Ceramic Preconverter Systems," SAE Technical Paper 950407, 1995, https://doi.org/10.4271/950407.
- “Design Considerations for a Ceramic Preconverter System,” SAE 940744 Gulati, S. T. Socha, L. S. Then, P. M. Stroom, P. D. February 1994
- “Design and Performance of a Ceramic Preconverter System, CAPoC-3,” Gulati, S. T. Socha, L. S. Then, P.M. Brussels, Belgium April 1994
- “Advanced Three-way Catalyst Formulations for High Temperature Applications,” SAE Paper 930076 Bartley, G. J. J. Shady, P.J. D'Aniello, M.J. Jr. Chandler, G.R. Brisley, R.J. Webster, D.E. March 1993
- “Use of Light-Off Catalysts to Meet the California LEV/ULEV Standards,” SAE Paper 930386 Summers, J. C. Skowron, J.F. Miller, M.J. March 1993
- “Development of Pd-only Three Way Catalyst Technology,” SAE Paper 941058 Hepburn, J. S. Patel, K.S. Meneghel, M.G. Gandhi, H.S. March 1994
- “Warm-Up Characteristics of Thin Wall Honeycomb Catalysts,” SAE Paper 910611 Yamamoto, H. Kato, F. Kitagawa, J. Machida, M. March 1991
- “Light-Off Performance of Catalytic Converters: The Effect of Heat/Mass Transfer Characteristics,” SAE Paper 910610 Ryan, M. J. Becker, E. R. Zygourakis, K. March 1991
- “The Design of a New Ceramic Catalyst Support,” SAE Paper 902167 Day, J. P. October 1990
- “New Developments in Catalytic Converter Durability,” Catalyst and Automotive Pollution Control II September 1990 Brussels, Belgium Gulati, S.T.
- “Reduced Energy and Power Consumption For Electrically Heated Extruded Metal Converters,” SAE Paper 930383 Socha, L. S. Thompson, D. F. Weber, P.A. February 1993
- “Optimization Of An Electrically-Heated Catalytic Converter System Calculations And Application,” SAE Paper 930384 Kaiser, F. W. Maus, W. Swars, H. Bruck, R. February 1993
- “Optimization Of Extruded Electrically Heated Catalysts,” SAE Paper 940468 Socha, L. S. Thompson, D.F. Weber, P.A. March 1994
- “Development Of An Alternator-Powered Electrically-Heated Catalyst System,” SAE Paper 941042 Laing, P.M. March 1994