This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Fast Lightoff Non-Electrically and Electrically Heated Microlith® Catalytic Converter
Annotation ability available
Sector:
Language:
English
Abstract
A low thermal mass, metal monolith, catalytic converter, was tested for reducing automotive emissions for applications both as lightoff and main converters. FTP testing was carried out to measure the first four minutes of Bag 1 emissions from a 2.2l, fuel-injected Plymouth Reliant, at New York State, Automotive Emissions Laboratory, Albany (NY-AEL). The car had aproximately 17,000 miles when tested and its driving history had been catalogued by NY-AEL. Both resistively heated and non-resistive mini-converter systems were tested in series with a conventional replacement new automotive converter.
- The non-resistive converter reduced HC, CO and NOx emissions by more than 50%, 40% and 30%, respectively. despite excess air addition. Lightoff occurred within 10 seconds of engine start. A modified cycle exploring steady state conditions under load showed greater than 70% reduction in NOx.
- The resistively-heated converter system further reduced THC, CO and NOx emissions, with lightoff occurring even earlier, without any pre-crank heating.
- Short-term durability of the catalyst and substrate was demonstrated through SEM and micrographic testing of the substrate from the test converter.
- The stock converter, aged for 17,000 miles, was compared against the replacement new converter and the performance drop is reported.
Recommended Content
Authors
- Subir Roychoudhury - Precision Combustion Inc.
- Dylan Hixon - Precision Combustion Inc.
- William Pfefferle - Precision Combustion Inc.
- Richard E. Gibbs - NY State Automotive Emissions Lab.
- William J. Webster - NY State Automotive Emissions Lab.
- Robert Johnson - NY State Automotive Emissions Lab.
- Gerald Wilson - NY State Automotive Emissions Lab.
Citation
Roychoudhury, S., Hixon, D., Pfefferle, W., Gibbs, R. et al., "Fast Lightoff Non-Electrically and Electrically Heated Microlith® Catalytic Converter," SAE Technical Paper 940467, 1994, https://doi.org/10.4271/940467.Also In
References
- Socha, L.S. Jr. Thompson, D.F. Weber P.A. “Reduced Energy and Power Consumption for Electrically Heated Extruded Metal Converters” SAE Paper 930383 March 1993
- Kubsh, J. Lissiuk, P. “Vehicle Emissions Performance with an Electrically Heated Converter System” SAE Paper 912385 International Fuels and Lubricants Meeting Toronto, Canada October 7-10 1991
- 1975 Federal Test Procedure Code of Federal Regulations
- Hellman, K.H. Piotrowski, G.K. Shaefer, R.M. “Evaluation of Different Resistively Heated Catalyst Technologies” SAE Paper 912382 October 1991
- Hurley, R.G. et al “Evaluation of Metallic and Electrically Heated Metallic Catalysts On a Gasoline Fueled Vehicle” SAE Paper 900504 February 1990
- Ma, T. et al “Exhaust Gas Ignition - A New Concept for Rapid Light-off of Automotive Exhaust Catalyst” SAE Paper 920400 February 1992
- Gottberg, I. et al “New Potential Exhaust Gas Aftertreatment Technologies for ‘Clean Car’ Legislation” SAE Paper 910840 February 1991
- Hochmuth, J.K. Burk, P.L. Tolentino, C. Mignano, M.J. “Hydrocarbon Traps for Controlling Cold Start Emissions” SAE Paper 930739 March 1993