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

Lai  Wei, Department of Chemical Engineering, University of Virginia

Lai Wei, Yu-Ren Chen, Yuntao Gu, William S. Epling
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 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.

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