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Numerical Design of Light-off Auto-Catalyst for Reducing Cold-Start Emissions
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 Title & Authors
Numerical Design of Light-off Auto-Catalyst for Reducing Cold-Start Emissions
Jeong, Soo-Jin; Kim, Woo-Seung;
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Light-off catalyst has been used for minimization of cold-start emissions. Improved cold-start performance of light-off catalyst needs the optimal design in terms of flow distribution, geometric surface area, precious metal loading, cell density and space velocity. In this study, these influential factors are numerically investigated using integrated numerical technique by considering not only 3-D fluid flow but also heat and mass transfer with chemical reactions. The present results indicate that uneven catalyst loading of depositing high active catalyst at upstream of monolith is beneficial during warm-up period but its effect is severely deteriorated when the space velocity is above 100,000 To maximize light-off performance, this study suggests that 1) a light-off catalyst be designed double substrate type; 2) the substrate with high GSA and high PM loading at face be placed at the front monolith; and 3) the cell density of the rear monolith be lower to reduce the pressure drop.
Light-Off Catalyst;Under-Body Catalyst;Cold-Start;Conversion Efficiency;Space Velocity;Chemical Reaction;
 Cited by
2륜 자동차 촉매변환기내 배기가스 온도균일도 특성과 Light-Off에 관한 연구,이중섭;정효민;이철재;정한식;

대한기계학회논문집B, 2007. vol.31. 6, pp.507-513 crossref(new window)
井上悳太, 近村銅司, 1997, '自動車原動機の環境對應妓術,' 朝倉書店, pp. 50-63

崔柄喆, 金大中, 孫建奭, 李貴榮, 1998, '低公害 動車のためのCCC(Close-Coupled Catalyst) システムの許價,' 自動車技術會論文集, Vol. 29, No.3, pp. 25-30

Oh, S. H., 1982, 'Transients of Monolithic Catalytic Converters: Response on Step Changes in Feed Stream Temperature as related to Controlling Automobile Emissions,' Industrial & Engineering Chemistry Production Development, Vol. 21, No. 29, pp. 29-37 crossref(new window)

Psyllos, A. and Philipppopoulos, C., 1993, 'Performance of a Monolithic Catalytic Converter Used in Automotive Emission Controll: The Effect of a Longitudinal Parabolic Active Metal Distribution,' Industrial & Engineering Chemistry Research, Vol. 32, pp. 1555-1559 crossref(new window)

Baratti, R., 1990, 'Optimal Activity Distribution in Nonuniformly Impregnated Catalyst Particles: Numerical Analysis,' Chemical Engineering Science, Vol. 45, No. 6, pp. 1643-1646 crossref(new window)

Baratti, R., Hua Wu , Massimo Morbidelli and Arvind Varma,1993, 'Optimal Catalyst Activity Profiles in Pellets- X. The Role of Catalyst Loading,' Chemical Engineering Science, Vol. 48, No. 10, pp. 1869-1881

Stefano Melis and Arvind Varma,1997, 'Optimal Distribution of Catalyst for a Case involving Heterogeneous and Homogeneous Reactions,' Chemical Engineering Science, Vol. 52, No. 2, pp. 165-169 crossref(new window)

Baratti, R. and Feckova, V., 1997, 'Optimal Catalyst Activity Profiles in Pellets. II. The Case of Multiple-Step Distributions,' Industrial & Engineering Chemistry Research, Vol. 36, pp. 3416-3420 crossref(new window)

Tronci, S., Baratti, R. and Gavriiilidis, A., 1999, 'Catalytic Converter Design for Minimisation of Cold-Start Emissions,' Chemical Engineering Communications, Vol. 173, pp. 53-77 crossref(new window)

馬場直樹, 大澤克幸, 1996, '觸媒暖機科程における界溫及び?化擧動の解析,' 自動車技術曾論文集, Vol. 27, No.3, pp. 59-65

Jeong, S-J and Kim, W. S., 1998, 'A Numerical Approach to Investigate Transient Thermal and Conversion Characteristics of Automotive Catalytic Converter,' SAE Paper 980881

정수진, 김우승, 1999,'자동차용 촉매변환기의 최적설계를 위한 열 및 유동특성에 대한 수치적 연구,' 대한기계학회논문집 B권, 제23권, 제7호, pp. 841-855

정수진, 김우승, 1999, '유동특성을 고려한 촉매변환기의 활성화(Light-Off) 성능에 관한 연구,' 자동차공학회논문집, 제7권 제5호, pp. 107-120

Jeong, S-J and Kim, W. S., 2000, 'Three-Dimensional Numerical Study on the Use of Warm-Up Catalyst to Improve Light-Off Performance,' SAE Paper 2000-01-0207

Paul Day J. and Socha, L. S., 1988, 'Impact of Catalyst Support Design Parameters on Automotive Emissions,' SAE Paper 881590

Paul Day J. and Socha, L. S., 1991, 'The Design of Automotive Catalyst Supports for Improved Pressure Drop and Conversion Efficiency,' SAE Paper 910371

Khalfi, A., Marcuccilli, F., Brilhac, J. F., Brillard, A. and Gilot, P., 1996, 'Behaviour of Three-Way Catalysts : Comparison between High-Cell Density Catalytic Converters and Conventional Ones,' Bull. Soc. Belg. Vol. 105, No.9, pp. 519-526

Lai, M. C. and Kim, J. Y., 1991, 'Three-dimensional Simulation of Automotive Catalytic Converter Internal Flow,' SAE Paper 912372

Vortuba, J., Mikus, O., Khue Nguen, Hlavacek, V. and Skrivanek, J.,1975, 'Heat and Mass Transfer in Honeycomb Catalysts-II,' Chemical Engineering Science, Vol. 30, pp. 201-206

STAR-CD Version 3.0 Mannual, 1997, Computational Fluid Dynamics Ltd.

Kim, Jeong-Yeol, 1993, 'Flow Distribution and Pressure Drop in Diffuser-Monolith Flows: Implications to the Automotive Catalytic Converter Design,' Ph.D Thesis, Wayne State University, pp. 52-57