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CHEE 323

28.10

TWC Catalyst Design: Monoliths

Design of the catalyst support is as important as fuel mixture control and catalytic chemistry.  From the perspective of plug flow reactor design, key issues/design parameters are:

space velocities from 10,000 to 100,000 l/hr depending on engine size and mode of driving

minimal pressure drop for improved engine output

low thermal inertia for quick heat up

Materials design issues include:

stability at to temperatures up to 800°C

ability to withstand rapid heating

surface area, metal dispersion and resistance to sintering

mechanical properties sufficient to last 160,000 km of use.

Most catalytic converters are constructed from ceramic monolithic supports of a magnesium aluminum silicate.

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