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Comparison of Chemical Kinetic Mechanisms in Simulating the Emission Characteristics of Catalytic Converters
Technical Paper
2000-01-1953
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Engine exhaust systems need to undergo continuous modifications to meet increasingly stricter regulations. In the past, much of the design and engineering process to optimize various components of engine and emission systems has involved prototype testing. The complexity of modern systems and the resulting flow dynamics, and thermal and chemical mechanisms have increased the difficulty in assessing and optimizing system operation. Due to overall complexity and increased costs associated with these factors, modeling continues to be pursued as a method of obtaining valuable information supporting the design and development process associated with the exhaust emission system optimization.
Insufficient kinetic mechanisms and the lack of adequate kinetics data are major sources of inaccuracies in catalytic converters modeling. This paper presents a numerical study that investigates the performance of different chemical mechanisms in simulating the emission conversion characteristics of catalytic converters during both steady state and transient conditions. The model considers the coupling effect of heat and mass transfer with the catalyst reactions as exhaust gases flow through the catalyst. The heat transfer model includes the heat loss due to conduction and convection. The effect of radiation is assumed to be negligible and is not considered. The resulting governing equations based on the conservation of mass, momentum and energy are solved by a tridiagonal matrix algorithm (TDMA) with a successive line under relaxation method. The performance of different chemical kinetic schemes is reviewed by comparing the results of numerical model with the experimental measurements.
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Citation
Shamim, T., Shen, H., and Sengupta, S., "Comparison of Chemical Kinetic Mechanisms in Simulating the Emission Characteristics of Catalytic Converters," SAE Technical Paper 2000-01-1953, 2000, https://doi.org/10.4271/2000-01-1953.Also In
References
- Oh, S.H. Cavendish, J.C. “Transients of Monolithic Catalytic Converters: Response to a Step Change in Freestream Temperature as related to Controlling Automobile Emissions,” Ind. Eng. Chem. Prod. Res.Dev. 21 29 1982
- Siemund S. Leclerc P. Schweich D. J. Prigent M. Castagna F. “Three-way Monolithic Converters: Simulations versus Experiments,” Chemical Engineering Science 51 15 3709 3720 1996
- Subramanian, B. Varma, A. “Reactions of CO, NO, O2, and H2O on Three-way and Pt/AL2O3 Catalyst,” Frontiers in Chemical Engineering Proceedings of the International Chemical Engineering Conference 1 231 240 1984
- Subramanian, B. Varma, A. “Reaction Kinetics on a Commercial Three-way Catalyst: the CO-NO-O2-H2O System,” Ind. Engng Chem., Prod. Res. Dec. 24 512 516 1985
- Koltsakis, G. C. Konstantinidis, P. A. Stamatelos, A. M. “Development and Application Range of Mathematical Models for 3-way Catalytic Converters,” Applied Catalysis B: Environmental 12 2 3 161 191 1997
- Voltz, S. E. Morgan, C. R. Liederman, D. Jacob, S. M. “Kinetic Study of Carbon Monoxide and Propylene Oxidation on Platinum Catalysts,” Ind. Engng Chem. Prod. Res. Dev. 12 294 1973
- Otto, N. C. LeGray W. J. “Mathematical Models for Catalytic Converter Performance,” SAE paper No. 800841 1980
- Montreuil, C. N. Williams, S. C. Adamczyk, A. A. “Modeling Current Generation Catalytic Converters: Laboratory Experiments and Kinetic Parameter Optimization - Steady State Kinetics,” SAE paper No. 920096 1992
- Shen, H. Shamim, T. Sengupta, S. Son, S. Adamczyk, A. “Performance Simulations of Catalytic Converters during the Federal Test Procedure,” Proceedings of the 33rd National Heat Transfer Conference August 15-17 1999 Albuquerque, New Mexico
- Chen, D. K. Oh, S. H. Bisselt, E. J. Van Ostrom, D. L. “A Three-dimensional Model for the Analysis of Transient Thermal and Conversion Characteristics of Monolithic Catalytic Converters,” SAE paper 880282 1988
- Gandhi, H. S. Delosh, R. G. Piken, A. G. Shelef, M. “Laboratory Evaluation of Three-way Catalysts” SAE Transactions 85 1976 201
- Taylor, K. C. “Automobile Catalytic Converters” Springer-Verlag Berlin, Heidelberg 1984
- Herz, R. K. “Dynamic Behavior of Automotive Catalysts. 1. Catalyst Oxidation and Reduction.” Ind. Engng Chem. Prod. Res. Dev. 20 451 457 1981
- Li, P. Adamczyk, A. A. Pakko, J. D. “Thermal Management of Automotive Emission Systems: Reducing the Environmental Impact,” The Japan-U. S. Seminar on Thermal Engineering for Global Environment Protection (A-3) 1994
- Koltsakis, G. C. Stamatelos, A. M. “Catalytic Automotive Exhaust Aftertreatment,” Progress in Energy and Combustion Science 23 1 1997 1 39