Abstract
In a gasoline exhaust aftertreatment system, a three-way catalytic converter (TWC) is used for the reduction of CO, HC, NOx. Recently, for the reduction of particulate matters (PMs) including soot, a gasoline particulate filter (GPF) is also needed. The coated GPF, called a four-way catalytic converter (FWC), has been developing. However, the performance of the catalyst may be dropped by the deposited soot. In this study, we simulated a CO catalytic reaction in the GPF with soot deposition layer. Effects of substrate temperature, inflow velocity, and the amount of deposited soot were investigated. Results show that, when there is soot layer on the filter wall, the distribution of the velocity across the filter wall changes. When the substrate temperature is higher or the inflow velocity is smaller, the conversion ratio of CO to CO2 increases. The soot layer changes the velocity across the filter, which affects the CO conversion ratio.
