Browse Publications Technical Papers 2005-01-2158
2005-05-11

Advanced Three-Way Catalysts - Optimisation by Targeted Zoning of Precious Metal 2005-01-2158

Emissions from (and cost of) three-way catalysts can minimised by targeted application of PGM along the catalyst's length rather than the conventional homogeneous distribution. Experiments are described demonstrating pollutant conversion as a function of catalyst length during the European MVEG-B cycle. It is shown that most pollutant conversion occurs on the front portion, and that therefore the most effective catalysts have the majority of the PGM content there. Further analysis of the three legislated pollutants CO, HC and NOx leads to insights about the optimum distribution of Pt, Pd and Rh within the catalyst. In advantageous circumstances bi or trimetallic systems can be partially replaced with Rh-only systems with significant cost and backpressure benefits. Further experiments comparing zoned catalysts with current catalysts whose PGM is homogeneously distributed are described, demonstrating additional performance benefits.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Effects of Oil-Derived Contaminants on Emissions from TWC-Equipped Vehicles

2000-01-1881

View Details

TECHNICAL PAPER

Integration of Engine Controls, Exhaust Components and Advanced Catalytic Converters for ULEV and SULEV Applications

2001-01-3664

View Details

TECHNICAL PAPER

The Effect of Ambient Temperature on the Emissions of Some Nitrogen Compounds:A Comparative Study on Low-, Medium- and High-Mileage Three-Way Catalyst Vehicles

950933

View Details

X