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Thermal Response of Monolithic Catalytic Converters During Sustained Engine Misfiring: A Computational Study
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Abstract
The thermal response characteristics of automobile monolithic converters during sustained engine misfiring have been studied using a mathematical model which accounts for the simultaneous processes of heat transfer, mass transfer, and catalytic reaction. Particular attention was given to the effects of converter properties and inlet exhaust conditions on the location and magnitude of the temperature peak developed during the transient. Our simulation results show that the temperature excursions in typical monolith converters during engine misfiring are generally characterized by an ignition zone (where a steep exothermic temperature rise occurs as a result of rapid reaction) preceded by a relatively short, unreactive region near the inlet. Also, the predicted maximum wall temperature correlates well with the adiabatic reaction temperature, and the melting point of the monolith substrate would not be exceeded unless the extent of engine misfiring is 40% or higher.
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Citation
Oh, S., "Thermal Response of Monolithic Catalytic Converters During Sustained Engine Misfiring: A Computational Study," SAE Technical Paper 881591, 1988, https://doi.org/10.4271/881591.Also In
References
- Gulati, S. T. Merry, R. P. “Design Considerations for Mounting Material for Ceramic Wall-Flow Diesel Filters,” SAE Paper 840074
- Chen, D. K. S. Bissett, E. J. Oh, S. H. Van Ostrom, D. L. “A Three-dimensional Model for the Analysis of Transient Thermal and Conversion Characteristics of Monolithic Catalytic Converters,” SAE Paper 880282
- Verma, A. AC Spark Plug Division, General Motors Corporation Flint, MI 1987
- Morgan, C. R. Carlson, D. W. Voltz, S. E. “Thermal Response and Emission Breakthrough of Platinum Monolithic Catalytic Converter,” SAE Paper 730569
- Mondt, J. R. “A Guard System to Limit Catalytic Converter Temperature,” SAE Paper 760320
- Oh, S. H. Cavendish, J. C. “Transients of Monolithic Catalytic Converters: Response to Step Changes in Feedstream Temperature as Related to Controlling Automobile Emissions,” Ind. Eng. Chem. Prod. Res. Dev. 21 29 1982
- Mondt, J. R. General Motors Research Laboratories Warren, MI 1981
- Morooka, Y. Ozaki, A. “Regularities in Catalytic Properties of Metal Oxides in Propylene Oxidation,” J. Catal. 5 116 1966
- Cant, N. W. Hall, W. K. “Catalytic Oxidation. II. Silica Supported Noble Metals for the Oxidation of Ethylene and Propylene,” J. Catal. 16 220 1970
- Trim, D. L. “Catalytic Combustion (Review),” Appl. Catal. 7 249 1983
- Bensalem, O. Ernst, W. R. “Mathematical Modeling of Homogeneous-Heterogeneous Reactions in Monolithic Catalysts,” Combus. Sci. Technol. 29 1 1982
- Hindmarsh, A. C. “GEARIB, Solution of Implicit Systems of Ordinary Differential Equations with Banded Jacobian,” Lawrence Livermore Laboratory Report UCID 30130 February 1976
- Dalla Betta, R. A. McCune, R. C. Sprys, J. W. “Relative Importance of Thermal and Chemical Deactivation of Noble Metal Automotive Oxidation Catalysts,” Ind. Eng. Chem. Prod. Res. Dev. 15 169 1976
- Kim, S. “Characterization of Fresh and Vehicle-Aged Catalysts by Analytical Electron Microscopy,” 46th Annual Meeting of the Electron Microscopy Society of America Milwaukee, WI August 1988
- Powell, B. R. General Motors Research Laboratories Warren, MI 1985
- Cole, C. AC Spark Plug Division, General Motors Corporation Flint, MI 1987
- Schmitz, J.-C. European Technical Center, General Motors Luxembourg S.A. 1988
- Hawes S. W. AC Spark Plug Division, General Motors Corporation Flint, MI 1988
- Nonnenmann, M. “Metal Supports for Exhaust Gas Catalysts,” SAE Paper 850131
- Otto, N. C. LeGray, W. J. “Mathematical Models for Catalytic Converter Performance,” SAE Paper 800841