Abstract
Abstract A test rig has been designed and built to examine the effects of catalyst construction in isolation. The test method utilises a fully stabilised engine with constant manifold downpipe temperature and mass flowrate. The catalysts examined were chosen to emphasize the thermal aspects of catalyst design. The light-off performance of four different catalysts was investigated to determine the effects of cell density (for three metallic catalysts) and monolith material (ceramic versus metallic catalysts). The cell density determines the thermal inertia and, for the metallics, it was found that the thermal inertia was directly related to the light-off performance - low cell density had low thermal inertia and produced faster light-off. Direct comparison between 400 cells/in 2 ceramic and metallic monoliths showed the ceramic to be superior on light-off, despite a higher thermal inertia. The low thermal conductivity of the ceramic monolith kept the centre of the monolith at a higher temperature than the metallic and produced a better light-off performance.
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