Development of Canistering Systems for Monolithic Catalysts

The paper contents the description of two different canister systems for monolithic catalysts.

The first version is an underhood system fitted directly to the exhaust manifold, which has to stand a very high exhaust gas temperature impact as well as gas pulsations and engine vibrations. The difficulties to overcome both thermal expansion effects and dimension tolerances of the monolithic units are explained based on test results.

The second version is a ceramic wrapping canister system developed for an underfloor catalyst configuration, which because of the lower thermal and mechanical loads can be designed in a more cost-efficient manner.