Development of a Numerical Model to Predict the Impact of Phosphorus on Flow through Aftertreatment Components

Praveen Chavannavar

doi:10.4271/2012-01-1299

A predictive numerical model was developed to determine the impact of phosphorus exposure on the performance of flow through aftertreatment components such as Diesel Oxidation Catalysts (DOC) or Selective Catalytic Reduction (SCR) catalysts. The model is able to successfully determine the distribution of the phosphorus over the catalyst as a function of the aging history (temperature, flow rates, oil consumption rate, phosphorus content of the oil) as well as the component properties (diameter, length, cell density, wall thickness).

The model then incorporates this information regarding the distribution of phosphorus over the catalyst surface to determine the impact of the phosphorus exposure on the overall catalytic activity. The model results were successfully validated using accelerated bench aging tests for the oxidation of hydrocarbons over DOC's and NH₃ oxidation and NOx reduction over SCR catalysts.

The modeling approach and methodology should, however, be readily extendable to wall flow aftertreatment components such as Diesel Particulate Filters (DPF) as well as other flow through components such as Lean NOx Traps (LNT's) that were not included in this study.

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Development of a Numerical Model to Predict the Impact of Phosphorus on Flow through Aftertreatment Components 2012-01-1299

SAE MOBILUS