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Substrate Effects on Light-Off - Part II Cell Shape Contributions
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Abstract
In the preceding paper the specific heat capacity, substrate heat capacity, and energy requirements of two types of substrates were discussed in detail both from the standpoint of predictions from measured material property values as well as actual energy measurements on ceramic and metal products. This information is valuable for the catalyst designer because of the light-off impact of this energy requirement. Some material was also presented regarding the change in this energy requirement with washcoat loading.
Other aspects of the substrate which could reasonably come into play to enhance the light-off characteristics of a catalyst are the rates of heat and mass transfer. The latter of these could reasonably be expected to drive the catalyst activity. In addition, the pressure drop which results from the substrate structure could influence and limit the choice of cell configurations and product shapes and sizes, thereby constraining the list of possible options.
These three features - heat transfer, mass transfer, and pressure drop - can all be dealt with by considering the shape of the cell and its impact on the relevant parameters. As with the previous paper, these features will be discussed against the backdrop of the square and sinusoidal cell structures which are available on the market today.
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Day, J., "Substrate Effects on Light-Off - Part II Cell Shape Contributions," SAE Technical Paper 971024, 1997, https://doi.org/10.4271/971024.Also In
References
- Hu Z. Heck R.M. “High Temperature Ultra Stable Close Coupled Catalysts” SAE Paper # 950254 1995
- Machida M. Yamada T. Makina M. “Study of Ceramic Catalyst Optimization for Emission Purification Efficiency” SAE Paper # 940784 1994
- Day J. Paul “Substrate Effects on Light-Off - Part I Thermal Energy Requirements” SAE Paper # 962074 1996
- Holman J.P. Heat Transfer McGraw-Hill Book Company NY, NY 1963 111 262 263
- Kays W.M. Convective Heat and Mass Transfer McGraw-Hill Book Company NY, NY 1966 109
- Holman J.P. Heat Transfer McGraw-Hill Book Company NY, NY 1963 311 314
- Streeter V.L. Wylie E.B. Fluid Mechanics McGraw Hill Book Company, Inc. NY, NY Seventh 1979 193
- Vennard J. K. Elementary Fluid Mechanics John Wiley and Sons, Inc Fourth Edition 1961 290
- Kays W.M. London A.L. Compact Heat Exchangers McGraw-Hill Book Company NY, NY Second 1955 33
- Day J. Paul Socha, Louis S. Jr. “The Design of Automotive Catalyst Supports for Improved Pressure Drop and Conversion Efficiency” SAE Paper # 910371 1991
- Holman J.P. Heat Transfer McGraw-Hill Book Company NY, NY 279
- Handbook of Heat Transfer Fundamentals Rohsenow W.M. Hartnett J.P. Ganic E.N. McGraw-Hill Book Co. NY, NY Second 1993 7 91
- Handbook of Heat Transfer Fundamentals Rohsenow W.M. Hartnett J.P. Ganic E.N. McGraw-Hill Book Co. NY, NY Second 1993 7 177
- Held W. Rohlfs M. Maus W. Swars H. Brück R. Kaiser F.W. “Improved Cell Design for Increased Catalytic Conversion Efficiency” SAE Paper # 940932 1994
- Maus W. Brück R. 1995
- Faltmeier G. Pfalzgraf B. Brück R. Kruse C. Maus W. Donnerstag A. “Catalyst Concepts for Future Emission Legislation demonstrated at a 1,8 ltr., 5V Engine” Vienna Motorsymposium Vienna, Austria April 1996 398 417
- Day J.P. Socha, L.S. Jr. “Technique for the Analysis of FTP Emissions” SAE Paper # 920724 1992
- Day J.P. “Analysis of Catalyst Durability Data from the Standpoint of Substrate Surface Area” SAE Paper # 952397 1995
- Gulati S.T. “Cell Design for Ceramic Monoliths for Catalytic Converter Application” SAE Paper # 881685 1988
- Nonnenmann M. “Metal Supports for Exhaust Gas Catalysts” SAE Paper # 850131 1985
- “Metallische Katalysatorenträger/Exhaust Gas Katalyser with Metallic Supports” Product brochure of INTERATOM GmbH February 1986
- “The new generation of metallic catalytic-converter substrates” Product brochure of Emitec Gesellshaft für Emissionstechnologie mbH
- “Smaller-sized stainless steel monolith catalyst attains catalyst performance comparable to that of ceramics” Nikkei New Materials September 26 1988
- Maus W. Bode H Prof. Dr. Reck A. “Neuentwicklung metallischer Katalysatorträger für Automobile - Einfluss der Katalysatorträger auf Motor und Abgas” September 15 1989
- Pelters S. Kaiser F.W. Maus W. “The Development and Application of a Metal Supported Catalyst for Porsche's 911 Carrera 4,” SAE # 890488 1989
- Nishizawa K. Masuda K. Horie H. Hirohashi J. “Development of Improved Metal-Supported Catalyst” SAE Paper # 890188 1989
- Swiatek G. Rudnicki R. Gettel L. Unger T. “Catalytic Exhaust Emission Control of Small Internal Combustion Engines” SAE Paper # 891799 1989
- Takada Toshihiro Tanaka Takashi “Development of a Highly Heat-Resistant Metal Supported Catalyst” SAE Paper # 910615 1991
- Kaiser F.-W. Pelters S. “Comparison of Metal-Supported Catalysts with Different Cell Geometries” SAE Paper # 910837 1991
- Bode H. Maus W. Swars H. “How Metal Substrates are Able to Have an Influence on Converter Efficiency” Product brochure of Emitec Gesellshaft für Emissionstechnologie mbH
- Reck Alfred “Metallic Substrates for Catalysts in Passenger Cars, Two and Three Wheelers” Association of Indian Automobile Manufacturers Seminar: “Catalytic Converters: Fresh Steps” Feb. 20-21 1995 Bangalore, India
- Brück R. Diewald R. Hirth P. Kaiser F.W. “Design Criteria for Metallic Substrates for Catalytic Converters” SAE Paper # 950789 1995