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Flow Effects in Monolithic Honeycomb Automotive Catalytic Converters
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English
Abstract
This paper describes the results of durability tests of monolithic catalytic converters with mechanical devices used to tailor the exhaust gas flow. Deflectors of several different shapes show promise of extending the useful life of the converter by improving conversion efficiencies of hydrocarbons and CO. The tests were run on engine/dynamometers with round cross-sectional area samples and with symmetrical inlet cones. Improvements are found in initial activity and reduced deterioration. The penalty for altering the flow is in slower catalyst light-off and increased pressure drop.
Sequential photographs of catalyst light-off with different flow distributions are included as well as postmortem analysis of catalyst loading and poison deposition.
The potential benefits appear to be a result of a more balanced exhaust gas flow over the monolith cross section and thereby providing more effective use of the catalyst.
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Citation
Howitt, J. and Sekella, T., "Flow Effects in Monolithic Honeycomb Automotive Catalytic Converters," SAE Technical Paper 740244, 1974, https://doi.org/10.4271/740244.Also In
References
- Bagley, R.D. Doman, R.D. Duke, D.A. McNally, R.N. MULTICELLULAR CERAMICS AS CATALYST SUPPORTS FOR CONTROLLING AUTOMOTIVE EMISSIONS paper 73024 International Automotive Engineering Congress Detroit January 1973
- McDonald, A.T. Fox, R.W. Van Dewoestine, R.V. EFFECTS OF SWIRLING INLET FLOW ON PRESSURE RECOVERY IN CONICAL DIFFUSERS paper 71-84 AIAA 9th Aerospace Sciences Meeting January 1971
- Comfort, E.C. Howitt, J.S. MacBeth, J.W. CYCLE SIMULATION paper 730559 SAE Automotive Engineering Meeting Detroit May 1973
- Thermo-Systems, Inc. HOT FILM AND HOT WIRE ANEMOMETRY Theory and Application Bulletin TB5
- Eltinge, Lamont FUEL AIR RATIO AND DISTRIBUTION FROM EXHAUST GAS COMPOSITION SAE paper 680114