NOx Reduction in a Monolithic Reactor

Model ID: 10194

This suite of examples illustrate the modeling of selective NO reduction, that occurs as flue gases pass through the channels of a monolithic reactor in the exhaust system of a motored vehicle. The simulations are aimed at finding the optimal dosing of NH3, the reactant that serves as reducing agent in the process.

Three different analyses are performed:

  1. Kinetic analysis: Selectivity aspects of the kinetics are studied by modeling initial reaction rates as function of temperature and relative reactant amounts. Information is gained regarding the conditions that are preferred to attain the desired selectivity.
  2. Process modeling: A reactive monolith channel is modeled as a non-isothermal plug flow reactor. This model reveals necessary minimal dosing level of NH3, based on the working conditions of the catalytic converter.
  3. Detailed process modeling: A 3D model of the full reactor monolith is set up and solved, including mass transport, heat transfer and fluid flow. The model reveals the full space-dependency of the problem and lets us confirm or further adjust the dosing levels.