Browse Publications Technical Papers 2015-01-1009
2015-04-14

High Porosity Substrates for Fast-Light-Off Applications 2015-01-1009

Regulations that limit emissions of pollutants from gasoline-powered cars and trucks continue to tighten. More than 75% of emissions through an FTP-75 regulatory test are released in the first few seconds after cold-start. A factor that controls the time to catalytic light-off is the heat capacity of the catalytic converter substrate. Historically, substrates with thinner walls and lower heat capacity have been developed to improve cold-start performance. Another approach is to increase porosity of the substrate. A new material and process technology has been developed to significantly raise the porosity of thin wall substrates (2-3 mil) from 27-35% to 55% while maintaining strength. The heat capacity of the material is 30-38% lower than existing substrates. The reduction in substrate heat capacity enables faster thermal response and lower tailpipe emissions. The reliance on costly precious metals in the washcoat is demonstrated to be lessened. The microstructure of the new substrate material is optimized for washcoat compatibility and to maintain strength. The new materials are confirmed to be thermomechanically robust for service in the harsh exhaust system environment.

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

Development of a Super-Light Substrate for LEV III/Tier3 Emission Regulation

2015-01-1001

View Details

TECHNICAL PAPER

Development of Pd-Only Catalyst for LEV III and SULEV30

2015-01-1003

View Details

TECHNICAL PAPER

Acidic Zirconia Mixed Oxides for NH3-SCR Catalysts for PC and HD Applications

2011-01-1327

View Details

X