Kinetic modeling of sulfur poisoning and hydrothermal aging over Cu-SSZ-13 for NH3-SCR

Lai  Wei, Department of Chemical Engineering, University of Virginia

As a successfully commercialized SCR catalyst for diesel after-treatment systems, Cu-SSZ-13 has received a lot of attention. Although this catalyst has many strengths, sulfur poisoning and hydrothermal aging are always key deactivation factors. In the present study, a kinetic model for Cu-SSZ-13 catalyst including sulfur poisoning and hydrothermal aging was developed using the MATLAB Simulink platform. Different responses of Z2Cu and ZCuOH towards SO2 exposure, decomposition of different kinds of sulfur containing species, and migration of Cu species were considered. As a result, this model could simulate not only the performance of fresh and sulfur poisoned Cu-SSZ-13 catalysts, but also the interaction of sulfur poisoning and hydrothermal aging. Experimental results were used for parameter estimation and verification.