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CHEE 323

28.11

TWC Catalyst Design: Monoliths

Monolithic honeycombs are used

in the place of pellets.  The most

common cell structure used has

62 cells/cm2 with a 0.152 mm

thick wall to give a bulk

density of 0.4 g/cm3.

The ceramic has a relatively

low surface area for catalysis,

and a “washcoat” in the form of an

aqueous suspension of alumina and

other components is applied and fixed by calination.

The washcoat provides a means of dispersing precious metals to a high degree, while reducing coalescence sintering and acting as a sink for poisons.  These proprietary application procedures are highly evolved.

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