Reducing Cold-Start Emissions by Catalytic Converter Thermal Management

950409

02/01/1995

Event
International Congress & Exposition
Authors Abstract
Content
Vacuum insulation and phase-change thermal storage have been used to enhance the heat retention of a prototype catalytic converter. Storing heat in the converter between trips allows exhaust gases to be converted more quickly, significantly reducing cold-start emissions. Using a small metal hydride, the thermal conductance of the vacuum insulation can be varied continuously between 0.49 and 27 W/m2K (R-12 to R-0.2 insulation) to prevent overheating of the catalyst. A prototype was installed in a Dodge Neon with a 2.0-liter engine. Following a standard preconditioning and a 23-hour cold soak, an FTP (Federal Test Procedure) emissions test was performed. Although exhaust temperatures during the preconditioning were not hot enough to melt the phase-change material, the vacuum insulation performed well, resulting in a converter temperature of 146°C after the 23-hour cold soak at 27°C. Compared to the same converter at ambient conditions, overall emissions of CO and HC were reduced by 52% and 29%, to 0.27 and 0.037 g/mile, respectively. The maximum converter temperature during the FTP cycle was 720°C. This limited testing was performed with a nearly-fresh palladium-only catalyst, but demonstrates the potential of this vacuum insulation approach for emissions reduction and thermal control. Further testing is ongoing. An initial assessment of several production issues is made, including high-volume fabrication challenges, durability, and cost.
Meta TagsDetails
DOI
https://doi.org/10.4271/950409
Pages
8
Citation
Burch, S., Potter, T., Keyser, M., Brady, M. et al., "Reducing Cold-Start Emissions by Catalytic Converter Thermal Management," SAE Technical Paper 950409, 1995, https://doi.org/10.4271/950409.
Additional Details
Publisher
Published
Feb 1, 1995
Product Code
950409
Content Type
Technical Paper
Language
English