An exhaust treatment device

摘要

An exhaust treatment device 38 for an internal combustion engine 10 is disclosed which contains multiple, parallel channels 72 of a porous material such as cordierite or silicon carbide. Some of the channels 72 of the exhaust treatment device 38 are plugged at an upstream end and other channels remain unplugged. In one embodiment, the substrate has an SCR coating and the engine has a urea supply system but other embodiments using TWC and LNT formulations are possible and several washcoat configurations and other features to encourage cross-flow between the channels 72, diffusion between the channels 72 and adsorption are disclosed herein.