Comparison of 4-way NOx Adsorber Catalyst Performance on Composite and Conventional Substrates

Neal  Currier, Cumins, Inc.

4-way NOx adsorber performance is dependent on a number of non-operating factors. These include catalyst composition, monolith cell size, monolith aspect ratio, substrate thermal properties, substrate material, and substrate wall morphology. The significance of substrate was scouted by comparing a standard cordierite monolith to a composite monolith. Flexibility in the choice of catalyst loading and differences in heat distribution were found to play a significant role in determining NOx performance of these devices.