Exhaust Catalyst Thermal Management

The rate at which the catalyst heats up is an important factor in the control of the start-up emissions of an engine. A number of measures have been used to improve this:

An exhaust catalyst runs at a high temperature internally and has a high surface temperature that also needs to be accounted for when packaging.

Bauer et al showed that All measures intended to reduce heat output, should be applied to all elements of the exhaust system (manifold, cones, catalytic converter), as otherwise the component’s thermal load is unchanged.

Reference

Steve D. Burch, Thomas F. Potter, Matthew A. Keyser, "Reducing Cold-Start Emissions by Catalytic Converter Thermal Management", SAE 950409

Hans Bauer, H., G. Haldenwanger, Peter Hirth, Rolf Brück, "Thermal Management of Close Coupled Catalysts" SAE 991231

See also: Exhaust Catalyst.

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Subjects: Automotive Engines