This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Washcoat Technology and Precious Metal Loading Study Targeting the California LEV MDV2 Standard
Annotation ability available
Sector:
Language:
English
Abstract
Meeting the California Medium-Duty truck emissions standards presents a significant challenge to automotive engineers due to the combination of sustained high temperature exhaust conditions, high flow rates and relatively high engine out emissions. A successful catalyst for an exhaust treatment system must be resistant to high temperature deactivation, maintain cold start performance and display high three-way conversion efficiencies under most operating conditions. This paper describes a catalyst technology and precious metal loading study targeting a California Medium-Duty truck LEV (MDV2) application. At the same time a direction is presented for optimizing toward the Federal Tier 1 standard through reduction of precious metal use. The paper identifies catalytic formulations for a twin substrate, 1.23 L medium-coupled converter. Two are used per vehicle, mounted 45 cm downstream of each manifold on a 5.7 L V8 engine.
Recommended Content
Authors
Topic
Citation
Smaling, R., Sung, S., and Bartlett, R., "Washcoat Technology and Precious Metal Loading Study Targeting the California LEV MDV2 Standard," SAE Technical Paper 961904, 1996, https://doi.org/10.4271/961904.Also In
References
- Heck R.M. Hu Z. Smaling R. Amundsen A. Bourke M.C. “Close Coupled Catalyst System Design and ULEV Performance After 1050°C Aging” SAE Paper 952415 1995
- Summers J.C. Skowron J.F. Miller M.J. “Use of Light-Off Catalysts to Meet the California LEV/ULEV Standards” SAE Paper 930386 1993
- Hepburn J.S. Patel K.S. Meneghel M.G. Gandhi H.S. Engelhard Team Johnson Matthey Team “Development of Pd-Only Three Way Catalyst Technology” SAE Paper 941058 1994
- Detling J. Hu Z. Lui Y.K. Smaling R. Wan C.Z. Punke A. “Smart Pd TWC Technology to Meet Stringent Standards” Studies in Surface Science and Catalysis 96 Elsevier 1995
- Hu Z. Heck R.M. “High Temperature Ultra-Stable Close Coupled Catalysts” SAE Paper 950254 1995
- Laing P.M. “Development of an Alternator-Powered Electrically-Heated Catalyst System,” SAE Paper 941042 1994
- Brunson G. Kubsh J.E. Whittenberger W.A. “Combining Heated and Unheated Core Functions for Improved Cold Start Emissions Performance” SAE Paper 932722 1993
- Socha L.S. Thompson D.F. Webber P.A. “Optimization of Extruded Electrically Heated Catalysts” SAE Paper 940468
- Oser P. Mueller E. Hartel G.R. Schurfeld A.M. “Novel emission Technologies with Emphasis on catalyst Cold Start Inprovements Status Report on VW-Pierburg Burner/Catalyst Systems” SAE Paper 940474
- Ma T. Collings N. Hands T. “Exhaust Gas Ignition (EGI) - A New Concept for Rapid Light-Off of Automotive Exhaust Catalyst SAE Paper 920400 1992
- Eade D. Hurley R.G. Rutter B. Inman G. Bakshi R. “Fast Light-Off of Underbody Catalysts Using Exhaust Gas Ignition (EGI)” SAE Paper 952417
- Hochmuth J.K. Burk P.L. Talentino C. Mignano M.J. “Hydrocarbon Traps for Controlling Cold Start Emissions” SAE Paper 930739 1993
- Kollmann K. Abthoff J. Zahn W. “Concepts for Ultra Low Emission Vehicles” SAE Paper 940469 1994
- Sims G.S. Johri S. “Catalyst Performance Study Using Taguchi Methods” SAE Paper 881589 1988
- Heywood J.B. “Internal Combustion Engine Fundamentals” McGraw-Hill 1988