This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Some Fundamental Characteristics of Automotive Catalyst Supports
Annotation ability available
Sector:
Language:
English
Abstract
Several features of the automotive catalyst support contribute to the performance of a catalytic converter system. Certainly the very high surface area and straight and uniform channels allow for an active catalytic surface while still providing a comparatively low back pressure. Other properties of the substrate such as mass and specific heat capacity prove deleterious to the rapid attainment of high conversion efficiency.
The size and shape of the channel also can have positive or negative effects, depending on the relative values of these factors, which contribute to both the back pressure and the heat/mass transfer. In turn, the mass transfer is directly related to the catalyst performance.
This paper examines the inter-relationships among these substrate parameters and performance properties using both calculations from measured substrate properties and measured substrate performance properties for comparison. Specifically, heat capacity, heat and mass transfer, back pressure, catalyst performance, and expected light-off performance are examined against the backdrop of the two most significantly different substrate channel structures available, the extruded square cell ceramic and the sinusoidal cell wrapped metal configurations.
Recommended Content
Authors
Citation
Day, J., "Some Fundamental Characteristics of Automotive Catalyst Supports," SAE Technical Paper 962465, 1996, https://doi.org/10.4271/962465.Also In
References
- ‘A Comparison of Ceramic and Metal Automotive Catalyst Supports,’ Day J.P. Thompson D.F. in Ceramics Today-Tomorrow‘s Ceramics (Materials Science Monographs, 66D) Vincenzini P. Elsevier Science Publishers B.V. 2531 2540 1991
- Schreyer W. Schairer J.F. ‘Compositions and Structural States of Anhydrous Mg-Cordierites: A Re-investigation of the Central Part of the System MgO-AI2O3-SiO2’ J. of Petrology v2 335 1961
- Metals Handbook 8th Edition 1 Am. Soc. of Metals 439
- Metals Handbook Desk Edition Am. Soc. of Metals 1985 20 13
- Op. cit. Metals Handbook Desk Edition 20 14
- Op. cit. Metals Handbook 8th Edition 1 623
- Gulati S.T. Sweet R.D. ‘Strength and Deformation Behavior of Cordierite Substrates from 70° to 2550°F’ SAE Paper # 900268 1990
- Op. Cit. Metals Handbook Desk Edition 16 3
- Lachman I.M. Bagley R.D. Lewis R.M. ‘Thermal Expansion of Extruded Cordierite Ceramics’ Amer. Ceram. Bul. 50 2 204 1981
- Touloukian Y.S. DeWitt D.P. Thermophysical Properties of Matter 12 1970 1140
- ‘The Development and Application of a Metal Supported Catalyst for Porsche’s 911 Carrera 4’ Pelters S. Kaiser F.W. Maus W. SAE Paper # 890488 1989
- Op. Cit. Touloukian DeWitt 5 1503
- “Substrate Effects on Light-Off - Part I Thermal Energy Requirements” Day J. Paul SAE Paper # 962074 October 1996
- ‘Metal Supports for Exhaust Gas Catalysts’ Nonnenmann Manfred SAE Paper # 850131 February/March 1985
- ‘Novel Autocatalyst Concepts and Strategies for the Future with Emphasis on Metal Supports’ …ser P. SAE # 880319 1988
- ‘Development of Improved Metal-Supported Catalyst’ Nishizawa K. Masuda K. Horie H. Hirohashi J. SAE # 890188 1988
- ‘Smaller-sized stainless steel monolith catalyst attains catalyst performance comparable to that of ceramics’ Nikkei New Materials September 26 1988
- ‘Neuentwicklung metallischer Katalysatorträger fur Automobile - Einfluss der Katalysatorträger auf Motor und Abgas” Maus W. Bode H Prof. Dr. Reck A. Presentation given at the Technische Akademie Wuppertal September 15 1989
- ‘The new generation of metallic catalytic-converter substrates’ Product brochure of Emitec Gesellshaft fur Emissionstechnologie mbH
- ‘Metallische Katalysatorentrager/Exhaust Gas Katalyser with Metallic Supports’ Product brochure of INTERATOM GmbH February 1986
- ‘Development of a Highly Heat-Resistant Metal Supported Catalyst’ Takada Toshihiro Tanaka Takashi SAE # 910615
- ‘Metallic Substrates for Catalysts in Passenger Cars, Two and Three Wheelers’ Reck Alfred Association of Indian Automobile Manufacturers Seminar: ‘Catalytic Converters: Fresh Steps’ Feb. 20-21 1995 Bangalore, India
- Kays W.M. London A.L. Compact Heat Exchangers McGraw-Hill Book Company, NY NY Second Edition 1955 33
- Streeter V.L. Wylie E.B. Fluid Mechanics McGraw Hill Book Company, Inc., NY NY Seventh Edition 1979 193
- Vennard J.K. Elementary Fluid Mechanics John Wiley and Sons, Inc Fourth Edition 1961 290
- ‘The Design of Automotive Catalyst Supports for Improved Pressure Drop and Conversion Efficiency’ Day J. Paul SAE Paper # 910371 February 1991
- Holman J.P. Heat Transfer McGraw-Hill Book Company, NY NY 1963 279
- Handbook of Heat Transfer Fundamentals Rohsenow W.M. Hartnett J.P. Ganic E.N. McGraw-Hill Book Company, NY NY Second Edition 7 177
- Kays W.M. Convective Heat and Mass Transfer McGraw-Hill Book Company, NY NY 1966 109
- ‘Technique for the Analysis of FTP Emissions’ Day J.P. Socha L.S., Jr. SAE Paper # 920724 February/March 1992
- ‘Analysis of Catalyst Durability Data from the Standpoint of Substrate Surface Area’ Day J.P. SAE Paper # 952397 October 1995
- ‘Catalyst Concepts for Future Emission Legislation demonstrated at a 1,8 ltr., 5V Engine’ Faltmeier G. Pfalzgraf B. Brück R. Kruse C. Maus W. Donnerstag A. Vienna Motorsymposium Vienna, Austria April 1996 398 417